30 CNC Operator Interview Questions & Answers
Below is a list of our CNC Operator interview questions. Click on any interview question to view our answer advice and answer examples. You may view 5 answer examples before our paywall loads. Afterwards, you'll be asked to upgrade to view the rest of our answers.
1. What versions of CAM software do you know?
How to Answer
CAM is an acronym for Computer-Aided Manufacturing. Some individuals also refer to CAM as Computer-Aided Machining or Computer-Aided Modeling. CAM refers to the use of software to control machine tools. For this reason, CAM is used in CNC operations.
There are several versions of CAM software that you may know, depending on your level of experience with CAM and the focus of your work. Some popular CAM software options may include:
- EDGECAM
- HSMWorks
- LinuxCNC
- Aspire
The interviewer would like for you to discuss the software that you know, and your level of comfortability with each program that you mention. You could specify how much time you have invested in learning your leading CAM software or even talk about your experience training others on these programs.
Written by Rachelle Enns on August 1st, 2020
Answer Example
"I am well versed in a variety of CAM programming and software including Mastercam, GibbsCAM and Siemens PLM Software. My strongest experience is with Mastercam, specifically with their mill and lathe solutions, from my experience at Company ABC. There, I used Mastercam for eight years. My secondary experience would be in GibbsCAM, as I worked with this software for around three years at Shop XYZ. I would rank my experience level in GibbsCAM as intermediate."
Written by Rachelle Enns on August 1st, 2020
2. How well do you know G-code?
How to Answer
G-code is the most widely used CNC programming language. G-code is also called preparatory code. This code tells a machine what kind of actions to perform, such as rapid movement, controlled feed movements, switch coordinate systems, set tool information, and more. G-code also communicates what kind of motion is desired. These motions include linear feed, circular fee, rapid positioning, and more.
Discuss with the interviewer your overall knowledge of G-code. Mention where you gained this knowledge and be sure to include how you will apply this knowledge to benefit them, should you be hired.
Written by Rachelle Enns on August 1st, 2020
Answer Example
"I am very comfortable with G-code. I first learned G-code while earning my certification in CNC Programming. First, I took the basics, such as programming with G00 & G01 linear movement, G02, and G03 radius generating. Then, I learned FANUC G-Code and how to apply it for mill programming. Overall, I rank my G-code skills as intermediate, and I am eager to expand my knowledge by taking coursework in macro-programming."
Written by Rachelle Enns on August 1st, 2020
3. Discuss the most difficult machinery-related challenge you have faced. How did you overcome the situation?
How to Answer
By providing details of the most challenging situation you have experienced in the workplace, the interviewer will gain a better idea of the challenges you are accustomed to handling.
If your biggest problem is relatively insignificant, the interviewer may get the impression that you are an inexperienced troubleshooter. If you can discuss a more significant machinery-related challenge that you have overcome, it will be apparent to the interviewer that you can handle elevated or less typical situations.
When you give your story-based example of the most difficult machinery-related challenge you have faced, try to deliver your response using the STAR framework. STAR is an acronym for Situation, Task, Action, Result. By organizing your answer in this way, you can keep your story on track, ensuring that the interviewer can follow along with ease.
Written by Rachelle Enns on August 1st, 2020
Answer Example
"(Situation) When I worked for Shop ABC, I encountered an issue with a waterjet cutter failing to start and then tripping. (Task) As the most seasoned CNC Operator on the floor at that time, I knew it was up to me to get the machine up and running independently. (Action) First, I checked to see if the emergency stop popped up. Then, I looked at the internal circuit breaker. I heard a crackling sound when I turned the machine on again. This sound indicated that I needed to check on the control transformer. It turns out the issue was water-related, and a leak was causing a short circuit in the power supply. Luckily, I am strong when it comes to troubleshooting and making repairs. By leveraging my mechanical knowledge and following the machine's manual, I was able to get the machine up and running in a short amount of time. (Result) My supervisor was very impressed that I observed the unusual sound and was glad that I jumped into action so quickly, avoiding significant downtime or permanent damage to the machine."
Written by Rachelle Enns on August 1st, 2020
4. We operate a variety of shifts. How will you help us to maintain continuity among workers and these varying shifts?
How to Answer
If you are joining a production or machine shop that runs long days or even runs a 24/7 operation, you will likely be working shift work. Alternatively, you may be dedicated to a particular shift and expected to hand your work off to a colleague when your day is complete.
The interviewer is looking for evidence that you pay attention to detail, communicate well, and deliver exceptional documentation. These efforts will make it much simpler to maintain continuity between shift changes and show that you actively support your team.
Discuss the ways that you will help the hiring company to operate all shifts with continuity; should you be hired. Provide as many details as possible related to your organizational skills and ability to collaborate with others.
Written by Rachelle Enns on August 1st, 2020
Answer Example
"In my current position, we run three shifts; a morning, an afternoon, and an evening shift. Because we are a 24/7 operation, each shift lead, and the operator must be fully in-the-know when we change hands. As your shop runs a similar operation, I will support continuity between shifts by ensuring my production and quality logs are always up-to-date. I will report any concerns or issues immediately and will brief the next operator before clocking out. In addition to this, I am ready and willing to learn and follow all shift change procedures that your shop has in place."
Written by Rachelle Enns on August 1st, 2020
5. Have you ever created or updated safety procedures or regulations?
How to Answer
Outdated policies put people and companies at risk. In the machining industry, this risk can significantly impact health and safety as well as production efficiency. Any machine operator, inexperienced or seasoned, understands how critical it is that policies and procedures be reviewed often and kept up to date at all times.
Perhaps you have been involved in the creation or updating of SOPs (Standard Operating Procedures) in the past. You may have been asked by an employer to help update procedures or policies related to your work, the use of a machine, or a safety-related regulation.
Express to the interviewer that you understand the importance of maintaining up-to-date safety procedures and regulations. Then, discuss any involvement you have had with SOP maintenance - big or small!
Written by Rachelle Enns on August 1st, 2020
Answer Example
"This year, I helped our Health and Safety Officer draft an outline for a revised safety training our company was launching for new hires. The training was to be a part of an updated onboarding process for CNC Operators. To begin, I helped to create the topics and general outline. I provided a lot of the technical information when it came to the use of our machines, and the Health and Safety Officer outlined most of the information to do with company policy and procedures. We hired a technical writer to fill in the blanks. Then, I helped with final edits before the program went to print. It was a very interesting experience, and I would be happy to be involved in a similar project in the future."
Written by Rachelle Enns on August 1st, 2020
6. On a scale of 1-10, how would you rank your skills in technical reading and writing? Support your response.
How to Answer
As a CNC Operator, your technical reading tasks will include interpreting blueprints and engineer designs. When it comes to technical writing, you may be required to write comprehensive reports and other documentation that require mechanical comprehension. Ranking yourself from 1-10 with ten being perfect, talk to the interviewer about your overall skill level in technical reading and writing. Be sure to give a realistic ranking, leaving some room for improvement as you learn and grow in your machining career.
Written by Rachelle Enns on August 1st, 2020
Answer Example
"I enjoy technical reading and writing challenges and consider myself to be a 'techie,' which is part of why I chose a career as a CNC Operator. I excelled in technical reading and writing while obtaining my Computer Numerical Control (CNC) Certification. My highest grades were in courses that focused on reading and interpreting specifications and blueprints and calculating dimensions. After graduating, I further developed my technical reading and writing skills while interning at Machine Shop ABC. Now, with eight years of experience as a CNC Operator, I can confidently say that my technical reading and writing skills are very well-honed. This combination of education and experience puts me at an 8.5 out of 10. I am very confident in my capabilities; however, there is always room for improvement and learning in an industry that is continually changing."
Written by Rachelle Enns on August 1st, 2020
7. Talk to me about your mathematical skills, specifically in trigonometry, and how these skills will benefit you in this CNC Operator role.
How to Answer
In CNC machining, you will use trigonometry in numerous tasks and processes. Trigonometry and other math applications will help you to determine tool location, coordinate values, and solve complex equations.
Discuss any math-related coursework that you have, and be sure to highlight your greatest mathematical strengths. Perhaps you have post-secondary education on math-related topics. Maybe you excelled in advanced math when you were in high school. Whatever your background may consist of, show the interviewer that you have the math skills required to succeed in this CNC Operator role.
Written by Rachelle Enns on August 1st, 2020
Answer Example
"As an experienced CNC Operator, I must understand the specifications of digital blueprints and mechanical drawings. I am well versed in applying trigonometric principles to determine coordinate values. I bring advanced skills in interpreting the symbolic language often included in engineer drawings and computer-generated 3D layouts. I am very familiar with Geometric Dimensioning and Tolerancing (GD&T), which I realize is a fundamental skill for success in this role. Every day in my current role, I apply advanced math concepts, specifically trigonometry, to calculate cutter or tool nose locations."
Written by Rachelle Enns on August 1st, 2020
8. Tell me about a time when you quickly adapted to the introduction of a new machine.
How to Answer
This question is an opportunity for you to give a story-based example that highlights your ability to adapt to new or unexpected situations in the workplace. As a CNC Operator, you must be ready to pivot, learn, and grow while ensuring that you maintain high standards of safety and excellence.
When providing an answer to 'Tell me about a time when...' try to use the STAR interview method. STAR is an acronym for Situation, Task, Action, Result. This approach will allow you to deliver as a story-based response while keeping your answer organized and easy to follow.
Written by Rachelle Enns on August 1st, 2020
Answer Example
"(Situation) Last year I was working on a milling machine that had just been delivered to the shop. The machine came from a different shop, so it wasn't new, but it was new to us. (Task) Since I am the most experienced CNC Operator in the shop, it was up to me to make sure the machine was in perfect working condition. (Action) I had worked with a similar piece of equipment in the past, but this particular one was a newer model. It took me some time to oil it up and do general maintenance to get it working perfectly. Then, the machine kept getting stuck, and the axes weren't lining up properly. I read the manual over again and realized the coding was wrong. The machine needed reconfiguration with the proper coding. (Result) Today, the machine is still running well, and we have not had any issues. I have a strong background in CNC programming software, and I enjoy these types of challenges. I like to figure out new equipment, how it works, and troubleshoot any issues that may be present."
Written by Rachelle Enns on August 1st, 2020
9. What is the primary function of Machine Control Unit (MCU)?
How to Answer
The interviewer is checking for your understanding of basic CNC Operator fundamentals. Essentially, Machine Control Unit (MCU) helps a CNC Operator to produce components by controlling a machine's motion. Many CNC Operators consider the MCU the core of a CNC system. An MCU receives the information it needs, processes that information, and then completes that step. Show the interviewer, in as simple terms as possible, that you understand MCU function and capabilities.
Written by Rachelle Enns on August 1st, 2020
Answer Example
"The primary function of an MCU is to read the coding instructions, and to send correct instructions to each part of the machine as it recognizes and interprets axis transfer commands. An MCU is also used to support the axis movement controls and amplifier circuits for managing the axis tools. It holds the reviewed signals of location and velocity for each drive axis. It also executes auxiliary control purposes like coolant or tools. The MUC receives all the information as to what is required and then sends the information to the proper tools to follow through on the job. The MCU is the brain behind the machine functions."
Written by Rachelle Enns on August 1st, 2020
10. As a CNC Operator, how do you ensure that your machines are properly maintained?
How to Answer
Safety is of critical importance for you as a CNC Operator, and the interviewer wants to see that you take special care when it comes to the maintenance and upkeep of your machines. Walk the interviewer through your process when it comes to maintaining the integrity of your machines. Be sure to express your enthusiasm for safety and attention to detail.
Written by Rachelle Enns on August 1st, 2020
Answer Example
"At the beginning of my shift, I make sure to have my safety gear on such as ear and eye safety equipment and non-slip boots. I check the machine for any safety violations. I do that by checking that the chuck is working correctly, I look for defective or dull tools and ensure that shields are not cracked or broken. I make sure not to wear any jewelry such as rings or a watch. I ensure my workspace is clean of clutter, and all parts are clamped securely. I don't wear loose clothing that can cause snagging in the equipment, and I take additional safety precautions such as shutting down equipment before performing any pre-checks. Safety is of utmost importance to me, which is why every move that I make on the job aligns with my training and my employers' health and safety procedures."
Written by Rachelle Enns on August 1st, 2020
11. How comfortable are you with interpreting work orders, blueprints, engineering plans, and orthographic drawings?
How to Answer
A CNC Operator spends a great deal of their time reading digital blueprints, engineer designs, and other types of complex technical documents. The interviewer wants to understand your level of comfort with these tasks.
To express yourself, consider ranking your skills from beginner, intermediate, advanced, or expert. If you have any education in machine technology or computer technology, be sure to include details of your related training.
Written by Rachelle Enns on August 1st, 2020
Answer Example
"I consider my knowledge in interpreting work orders, blueprints, and engineering plans to be at an advanced level. With around nine years of experience as a CNC Operator, I have a lot of exposure to these tasks. When I was completing my CNC Machine Operations degree, some of my education touched on orthographic drawings. I learned about constructing orthographic drawings, which I find to be very helpful knowledge now when I need to interpret them. Of course, there is always room for improvement, and I plan to be at an expert level in the next couple of years. I will achieve this goal by broadening my experience and taking online coursework related to more complex engineering plans and drawings."
Written by Rachelle Enns on August 1st, 2020
12. Many companies are currently hiring CNC Operators. Why do you want to work for our company?
How to Answer
If there are numerous CNC Operator positions available in your area, the hiring authority may want to know precisely why you are interested in joining their company. To deliver a sincere and specific response, you will want to spend time understanding the role and researching their company. You will also want to put in the time to ensure that their company's purpose and the environment are a good match for you and your needs.
While your passion and excitement for the job are essential factors, it's always good to have some hard stats prepared. For instance, saying 'I have heard great things about your company, and I know I would be an excellent fit for this job,' is not very specific. Try to find some information related to the company's accomplishments. Mention specifically how those accomplishments made an impression on you.
- Research the company
- Highlight a unique talking point
- Show enthusiasm for the company's growth or recent efforts
- Discuss how the company's efforts and success tie to your career goals
- Mention how you will contribute, should you be hired
If you think you have the right response, ask yourself honestly if the answer can apply to any other company. If the answer is yes, it's time to get more specific.
It's important to note that 'Why do you want to work for our company?' is a question often confused with, 'Why should we hire you?' Be sure that you answer this question distinctly. Focus on your work-related passions, desires, and how the environment of the company, and growth opportunities they present, align well with your career goals.
Written by Rachelle Enns on August 1st, 2020
Answer Example
"I want to work for your company for many reasons; however, the most personal and compelling include your safety record and the fact that I have two close friends who have worked here, and they have only positive things to say. I have spent a lot of time researching and getting to know your company, and I see that your safety record is unmatched. This partnership would be mutually beneficial in the sense that I put safety first in all that I do. I have a strong reputation as a seasoned CNC Operator who takes the time to care for my equipment. I also encourage my co-workers to take pride in their work by following best practices. Should you choose to hire me, I will make enthusiastic contributions to your productivity levels and will offer an unwavering commitment to safe work practices."
Written by Rachelle Enns on August 1st, 2020
13. What did you dislike about your most recent machine operating position? What did you most enjoy?
How to Answer
Most people have something that they dislike about their current or most recent position. It's entirely okay to express that you are not keen on a factor in the workplace; however, you must avoid a tone of negativity or complaining. When you answer this question, be sure not to speak poorly of your last shop or any of your co-workers. Keep your answer precise and avoid statements you may regret later.
The interviewer would like to know if there is a particular type of task that you find unenjoyable, or if there is something you would change if you could. Mention this task, and then move on by discussing what you are doing to make the task more enjoyable. Show that you are proactive and positive!
Next, discuss what you enjoy the most about your current or last position. Complete your interview response on a positive note by showing appreciation for your job and your company. Let your enthusiasm for machine work shine through. Last, be sure to tie in these positive factors with the job opportunity at hand.
Written by Rachelle Enns on August 1st, 2020
Answer Example
"I enjoyed nearly everything about my last shop and the position. If I could have changed anything, it would probably be the age of the equipment. Some of it was on its last legs, which made for a lot of troubleshooting some days. However, I approached the situation as a challenge and learned a great deal about mechanical repair and maintenance. What I enjoyed the most was the camaraderie among the team members. We all got along well, helped each other out, and had each others' back to ensure safety and compliance. When the shop was sold to a competitor, and we were laid off, it was sad to say goodbye; however, I am looking forward to applying my troubleshooting skills and team-based mindset here with your organization."
Written by Rachelle Enns on August 1st, 2020
14. Explain to me in simple terms - what is a vernier?
How to Answer
People often say that the better you understand a concept, the easier it should be for you to explain in simple terms. For this reason, the interviewer may ask you questions based on the fundamentals of CNC operations.
A vernier, in short, is a measuring tool used to measure parts of your work or a workpiece.
Take your existing knowledge of a vernier and explain it in simple, easy to understand terms. Imagine that you are describing a vernier to someone outside of your industry. How could you help them to understand?
Written by Rachelle Enns on August 1st, 2020
Answer Example
"I find that I have a knack for explaining concepts to others. I believe in the adage that if you cannot explain a concept to a Grade 5 student, then you don't understand it well enough. If I were to explain what a vernier is, in its simplest terms, I would say that it's a tool used to measure the parts that I make on the job!"
Written by Rachelle Enns on August 1st, 2020
15. How would you explain a micrometer to someone unfamiliar with our industry?
How to Answer
Many hiring authorities believe that the best way to gauge a candidate's understanding of a concept is to see how well they can teach it to someone new to the idea. How well do you know the fundamentals of the machining industry?
The interviewer would like to understand your level of knowledge when it comes to standard industry terms. The better you know a concept, the easier it should be for you to explain it in simple terms. You should have a clear response to this question, regardless of your level of experience as a CNC Operator. When it comes to the fundamentals of machine operations, what do you know, and how clearly can you explain?
Written by Rachelle Enns on August 1st, 2020
Answer Example
"A micrometer is a tool used to measure tiny distances or thicknesses. A micrometer can deliver measurement accuracy as small as one-thousandth of an inch. Today, a CNC Operator can choose to use a traditional micrometer or a digital micrometer. Both options are highly accurate."
Written by Rachelle Enns on August 1st, 2020
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16. What motivated you to pursue a career as a CNC Operator?
How to Answer
The hiring manager wants to know that you are passionate about your line of work. You can answer this question in a more personal way, expressing what initially motivated you to pursue a career as a CNC Operator.
Perhaps someone in your family influenced you to work in the machining industry. Maybe you have always had an engineering type of mind, and you enjoy mathematical challenges and working in a hands-on environment. Whatever your motivators, give the hiring manager an engaging and meaningful response. Express what initially excited you to become a CNC Operator, and what factors continue to motivate you today.
Written by Rachelle Enns on August 1st, 2020
Answer Example
"My interest in becoming a CNC Operator stems from when I began taking Software Engineering courses in University. I realized that I had a true knack for programming; however, I also knew that I wanted to work with my hands. These skills and interests are why I shifted to a career in machining and machine operating. I am pleased with my career choice and feel that it challenges me in a variety of areas such as mechanical troubleshooting, solving complex mathematical solutions, and interpreting engineering plans."
Written by Rachelle Enns on August 1st, 2020
17. Approximately how many hours of experience do you have operating a CNC machine?
How to Answer
Depending on your region, the hiring company may require you to possess a particular number of hours as a machine operator before being hired. Offhand, you may not have this number locked down, and that is okay!
Think about the percentage of your career you have spent operating a CNC machine and give your answer. You can then calculate your hours by assessing the amount of time you have worked as a CNC Operator. For instance, if you have three years of full-time operator experience, you have likely worked 2,080 hours per year. This calculation would amount to 6,240 hours across three years. Then, if you believe that you spend 75% of your workday operating machinery, you could accurately say that you have spent approximately 4,680 hours operating machines.
Written by Rachelle Enns on August 1st, 2020
Answer Example
"I have worked full time as a CNC Operator for five years, with about 3/4 of my days spent on various machines. So, rough calculations tell me that I spend about 6 hours per day operating a CNC machine. If I multiply this by 20 days per month, and 240 days per year, I estimate that I have spend around 1,440 hours per year operating a CNC machine. Over five years, that is over 7,000 hours. I am quite skilled when it comes to operating a CNC machine, and I look forward to putting in even more hours at your shop."
Written by Rachelle Enns on August 1st, 2020
18. Talk about a time when your good judgement saved your company from an accident or other costly incident.
How to Answer
The interviewer wants to hear a specific story-based example of a time when you were diligent and saved your company from a costly mistake. Perhaps you helped a co-worker to make the right decision when it came to a safety practice. Maybe your keen eye helped to you to troubleshoot a potential issue with a machine.
For this 'Talk about a time...' question, the interviewer is looking for a specific story-based example that highlights your good judgment in action. To deliver your story, try using the STAR framework, which is an acronym for Situation, Task, Action, Result.
Written by Rachelle Enns on August 1st, 2020
Answer Example
"(Situation) When I was working as a CNC Operator for Shop ABC, my colleague noticed that his cutting machine was moving in the opposite direction of the origin. Thoroughly puzzled, he shut the machine down and was about to call the machine manufacturer to come and perform a service, but the company could not come for three days. (Task) It turns out, I had seen this issue in the past and was quite certain that I could fix the problem. (Action) I received approval from our supervisor to do some troubleshooting. After closer inspection, I found a broken origin switch, the proximity switch to be specific, and a short circuit in the switch coil. I recommended that we replace the switch coil. Our supervisor agreed, and we had the part replaced. (Result) The machine began working as expected! My knowledge and good judgment saved the company from a potential accident and a lot of machine downtime. My employer was very thankful for my diligence and machine knowledge."
Written by Rachelle Enns on August 1st, 2020
19. Have you ever made an error that cost your company a significant amount of money?
How to Answer
Mistakes happen on the job, and sometimes they can be costly to a company, whether that cost is financial or time-related. What the interviewer wants to know is that you own up to any errors that you may make in the workplace. It's essential to show the hiring manager that you take accountability for your actions.
Think of a time when you made an error in the workplace. Discuss the situation, the steps that you chose to overcome the issue, and then the resolution.
If you have never made a costly mistake in the workplace: Rather than staying that you do not make mistakes, you can discuss a minor issue. Or, give a hypothetical example and explain how you would react if you found yourself in that situation.
Written by Rachelle Enns on August 1st, 2020
Answer Example
"Earlier in my career, I was working on an older style laser cutter and was working too quickly. The machine shorted, and we couldn't get it up and running again. I apologized profusely to my supervisor. Knowing that I owned the mistake and didn't make an excuse was enough for my manager to forget it ever happened. I was sure to be extra cautious after that."
Written by Rachelle Enns on August 1st, 2020
20. Tell me about a time when you met a strict deadline. What factors led to your success?
How to Answer
Being able to face strict and stressful deadlines is an important skill. Many CNC Operators work in high-pressure, fast-moving work environments, and the interviewer wants to know that you can handle the pressure that comes with the role.
Think about a specific time when you met a tight deadline. What skills and qualities did you deploy to reach the finish line on time? What was your supervisors' response to your excellent work?
When approaching a 'Tell me about a time...' question, it's best to answer by using the STAR interview method. STAR is an acronym for Situation, Task, Action, Result. By organizing your response using the STAR framework, you can give a story-based example that is easy to follow.
Written by Rachelle Enns on August 1st, 2020
Answer Example
"(Situation) Last month, we had a major client deadline. In the final week of our project, one of our lathes broke down. It was devastating to the team because everyone takes pride in their ability to get a job done on time. (Task) As the floor lead that day, and the most experienced in lathe troubleshooting, it was up to me to keep the team motivated. (Action) I called a quick floor meeting, where we put our heads together. Everyone committed to working overtime shifts until we met the deadline. I set to fixing the lathe while also calling a supplier to arrange for a temporary rental so that we could double up on the work. (Result) We worked the overtime hours and hit the deadline with only two hours to spare! The client was thrilled with our performance, and the situation drew us closer as a team."
Written by Rachelle Enns on August 1st, 2020
21. How do you encourage safe operations among your co-workers?
How to Answer
CNC Operators must only work on or program a CNC machine with the proper training. They are responsible for regular machine cleaning, upkeep, and maintenance, and they are held highly accountable for safe operations at all times. Looking out for your co-workers, whether they are new or seasoned CNC Operators, is a critical component of ensuring a safe work environment.
Perhaps you work hard to ensure that everyone wears proper PPE, including ear protection, safety glasses, and safety boots, when operating machinery. Maybe you are keen on warning other people when they appear to be at risk of breaching a safety procedure. Perhaps you double-check that machines are turned off and cleaned at the end of each use.
Walk the interviewer through the ways that encourage safe operations among your team. If you have a story-based example of a time when you helped to support safe operations in the workplace, be sure to highlight the actions that you took while showing enthusiasm for a safe work environment.
Written by Rachelle Enns on August 1st, 2020
Answer Example
"I am hyper-aware of safety on the job, and care about the fact that my co-workers should feel safe at work and always return home to their loved ones uninjured. Working as a CNC Operator is dangerous, being around all the machines, and with all of the potential distractions. I show diligence by ensuring that I, and everyone on shift, is wearing the proper PPE. This diligence includes the right non-slip safety boots and approved ear and eye protection. I do not hesitate to warn my co-workers when I see a potential risk, and I am also incredibly diligent with my documentation and logs. I also double-check that my machines are turned off and cleaned at the end of each use, ensuring that the next operator is walking into a safe situation."
Written by Rachelle Enns on August 1st, 2020
22. What programs have you used to document production and quality logs?
How to Answer
Proper (and clear) documentation of production and quality logs is a critical component to your success as a CNC Operator. For most roles, after you inspect your work for quality and accuracy, you will be expected to complete your production and quality logs. Speak to the interviewer about the fact that you are diligent with this task, well-organized, and compliant when it comes to completing your documentation clearly and on time.
If you have used production management software in the past, mention the one(s) with which you are most familiar. You may also bring experience with trusted pen-to-paper where you submit your logs physically without any program or digital system! Either way, express to the hiring manager that you are familiar with proper documentation and that you are ready and willing to comply with their company's documentation standards.
Written by Rachelle Enns on August 1st, 2020
Answer Example
"When I first began my career as a CNC Operator, all documentation was on paper and pen! I would submit my logs in a book every day and then have the logs signed off each time I cleared a machine. Now, in my current position, we use an internal system for typing in and submitting logs. I prefer this system as it's more secure, and its on the cloud, so the operators can instantly share data with our supervisors. Rest assured, I am careful and diligent with my production and quality logs. I submit my work on time and as expected."
Written by Rachelle Enns on August 1st, 2020
23. Discuss your experience with supply chain management, such as planning stock inventory and anticipating stock-related needs.
How to Answer
Open-ended questions like this one can be a challenge to respond to since it's tough to know where to begin and where to end. When discussing your general experience, it can be helpful to approach the query using the Past, Present, Future model.
- Past: Provide a brief overview of your experience in supply chain management, inventory, or other related tasks that a CNC Operator may need to perform.
- Present: Discuss your current job tasks as they relate to the question and the expectations of this CNC Operator position.
- Future: Talk about the ways that you want to grow in your supply chain management or stock-keeping knowledge. Discuss how this particular company will help you to achieve that knowledge.
When you frame your response using the Past, Present, Future method, it helps you to keep your thoughts on track, allowing you to deliver a well-organized answer with impact.
Written by Rachelle Enns on August 1st, 2020
Answer Example
"Before attending school to become a CNC Operator, I worked in a warehouse environment doing pick-pack for a big box retail company. In this role, I learned about general supply chain operations, stock management, and the importance of keeping accurate inventory. In my current position, I carefully check supply and equipment levels and then relay our needs to the supervisor once per week. Since taking over that task, our shop has never had an inventory issue - a fact that makes me very proud. I believe that my early experience in pick-pack helped set the foundation for my accurate and detailed nature. I saw in your job posting that this role requires experience with supply chain, inventory planning, and some inventory ordering. I am very comfortable with handling these types of responsibilities and look forward to helping your company maintain appropriate stock levels at all times."
Written by Rachelle Enns on August 1st, 2020
24. What do you know about our company and what we manufacture?
How to Answer
Going into your interview, you certainly don't need to be an expert on the company's products or what they manufacture. You should, however, have basic knowledge of the company's focus.
Start by searching the company website and look into who they provide products to, or what the company is known for manufacturing. You could also search for recent online reviews, news, and press. Talk about your findings when it comes to the company and what they manufacture. Be as detailed as possible, putting a spotlight on the fact that you have performed the necessary research. The more you know, the more you can express engagement and interest in the role.
Written by Rachelle Enns on August 1st, 2020
Answer Example
"I have researched your company extensively while preparing for this interview. What I learned was very interesting! I understand that you manufacture parts exclusively for the aerospace industry. The parts that you manufacture contribute to the assembly and maintenance of aircraft of all sizes. I learned that you primarily make hinges, manifolds, and clamps with a partial focus on custom manufactured parts. I am very excited at the thought of joining your company as a CNC Operator as I have a keen interest in working with high-quality metals such as titanium. Rest assured, I dedicate myself to delivering the precision that these manufactured products demand."
Written by Rachelle Enns on August 1st, 2020
25. What challenges do you face most often in your current position?
How to Answer
Everyone has particular challenges that arise in the workplace. As a CNC Operator, some of your challenges might include poorly maintained machines, a coworker choosing the wrong cutting tools, programming errors, or even power supply problems.
This question is designed for the hiring manager to find out if you have a consistent struggle or challenge with specific aspects of your current job. They also want to gauge your problem-solving capabilities. When you answer this query, highlight the problems that you face in your current position while also discussing how you overcome these challenges. Be sure to keep your response as positive and proactive as possible. Avoid any negativity or rants about your workplace or coworkers.
Written by Rachelle Enns on August 1st, 2020
Answer Example
"I enjoy working for my current employer; however, I find that the majority of my challenges are due to outdated equipment that causes numerous failures. As a result, I spend a lot of my time troubleshooting or repairing machines, and less time on the actual production process. I realize that the age and state of our equipment will not change, so I recently decided on a mindset shift. Now, rather than focusing on the fact that the equipment is unreliable, I focus on the fact that I learn something new every day when it comes to machinery troubleshooting and maintenance. Just this week, I learned how to fix a laser cutter when the trolly was not returning to the origin. I also fixed numerous light and light tube issues. All of these challenges are welcome because they mean that I will bring even more value to my next employer."
Written by Rachelle Enns on August 1st, 2020
26. Have you ever considered taking additional CNC training or related coursework?
How to Answer
As a CNC Operator, you must consider keeping your industry knowledge fresh and your education up-to-date. Hiring managers will likely give preference to a candidate who expresses interest in continued education. This continued education could include further safety courses, advanced engineering-related coursework, or even leadership workshops.
Think about the ways that you would like to see your career grow. Are there any additional learning opportunities that could help you to achieve these goals? With enthusiasm, discuss your interest in expanding your education and training.
Written by Rachelle Enns on August 1st, 2020
Answer Example
"My knowledge as a CNC Operator comes from a blend of college coursework and on the job training. I earned a Diploma in CNC Operations and would like to expand my knowledge to include a Certificate in CNC Programming at some point in my career. Does your organization offer continued education and training opportunities to top performers?"
Written by Rachelle Enns on August 1st, 2020
27. With which CNC equipment are you the most familiar?
How to Answer
In the world of machining, there are numerous pieces of equipment available to you. Depending on the size of the shops that you have worked within, and what the shop was manufacturing, you may have varying degrees of experience with several equipment types.
Some of the most common types of machines include:
- CNC Plasma Cutter: This machine is used to cut 2D metal and wood.
- CNC Laser Cutter: This machine uses a laser to cut metal, wood, and plastic.
- CNC Router: This machine can cut and engrave materials such as plastic, wood, and metal.
- 3D Printers: This machine works in a consistent motion to create a product or a part by slowly depositing plastic.
- Pick & Place Machines: This machine picks up and places electrical components to help build tech-based products such as computers, cell phones, and tablets.
When you discuss your experience, you can review your knowledge level of each piece of equipment by ranking yourself as a beginner, intermediate, advanced, or expert. This ranking will give the hiring authority a better idea of your existing expertise.
Written by Rachelle Enns on August 1st, 2020
Answer Example
"I am familiar with a wide range of CNC equipment including Pick & Place, Routers, 3D Printers, and more. If I had to rank my top skills, I would say I'm an advanced level operator of laser and plasma cutters. Most of my experience is in manufacturing using metal and plastic. In my current job, I operate a Baileigh PT-22 CNC Plasma Cutting Table and an Orion Motor Tech 40W Laser Cutter. Could you share with me further details on the CNC equipment you operate at this location?"
Written by Rachelle Enns on August 1st, 2020
28. Walk me through your education and how it has prepared you as a CNC Operator.
How to Answer
While attending post-secondary studies to become a CNC Operator, you would have learned many core skills for the job, such as reading blueprints. You will have also gained soft skills, such as clear communication or clean documentation. Think about what you learned from your higher education and how that knowledge applies to your current job, and how it will help you to succeed in this new opportunity.
Think about which courses were the most helpful to you in college or even high school. What were some of the most valuable educational takeaways from the classes you attended?
To keep your response very well organized, you could apply the Past, Present, Future framework to this response as well.
- Past: Provide a brief overview of your education, the classes you took, and any accolades you received along the way.
- Present: Discuss your current job tasks as they relate to your training, and talk about how your education has helped you to succeed as a CNC Operator.
- Future: We should never stop learning! Talk about the ways that you want to grow in your CNC-related education and knowledge. Discuss how this particular company will help you to achieve that knowledge. This query is an excellent opportunity to ask about any continued education opportunities this company offers its dedicated machine operators.
Written by Rachelle Enns on August 1st, 2020
Answer Example
"In 2006, I graduated from College ABC with my diploma in CNC Operations. This education gave me the foundation in safety procedures, equipment setup, and machine operation necessary to succeed as a machine operator. While in school, I took courses in lathe and mill operations as well as mechanical blueprint reading. I also touched on CNC programming, a topic that I found challenging yet fascinating. Today, in my current position, I use these foundations to ensure safe work practices and full efficiency on the job. My CNC programming course taught me geometry and trigonometry concepts that I use every day on the job. I am an avid learner and would like to continue my education over the next few years, focusing on topics that will ensure my continued success with your organization. These topics might include advanced CAD and additional training in Mastercam."
Written by Rachelle Enns on August 1st, 2020
29. As a CNC Operator, what was the most challenging part you have ever created?
How to Answer
CNC Operators work hard to manufacture the machined parts that we use in our every day lives. Some of these parts are straightforward, and others are highly complex. Talk to the interviewer about the parts that you are accustomed to creating. Perhaps you received digital blueprints for a highly complex part that required a great deal of blueprint interpretation and calculations using trigonometry. What have you found to be the most challenging task in your machining career so far?
Discuss a situation that comes to mind and try to organize your response using the STAR framework. STAR is an acronym for Situation, Task, Action, Result. By delivering your story-based response using this method, you can easily organize your thoughts and give a compelling story.
Written by Rachelle Enns on August 1st, 2020
Answer Example
"The toughest parts that I have created were surrounding aerospace components for the military when I worked as a CNC Operator for Company ABC. In that role, I faced added pressure for perfection, considering the nature of the parts. The parts we created were are much more complicated than one would think - not only because of the plans and precision but because of the materials we used, such as titanium and Kovar. In this role, I created parts such as miniature gears and sonic nozzles with precision venturis for flow measurement. These parts required skills in various micromachining techniques. Because of this experience, I feel well prepared to machine a multitude of complex parts."
Written by Rachelle Enns on August 1st, 2020
30. Have you ever encountered an engineering design that you could not understand? If so, how did you overcome this obstacle?
How to Answer
Everybody faces obstacles in the workplace - that's just a fact of life! The interviewer wants to understand what steps you take when you face a puzzling situation. As a CNC Operator, you work in a highly technical field so, you must have the ability to problem-solve. Show the interviewer how far will you go to find the information you need, while also avoiding a productivity slump.
Since the question is 'Have you ever...' and 'How did you...' the interviewer is looking for a story-based example that showcases your work in action. Your response to this question is best delivered using the STAR framework. STAR is an acronym for Situation, Task, Action, Result. By forming your answer using this method, you will stay on track when telling your story, ensuring that you set the stage correctly - allowing the interviewer to follow along easily.
Written by Rachelle Enns on August 1st, 2020
Answer Example
"(Situation) I am very experienced in reading mechanical blueprints and design; however, when working for Shop ABC, I came across a design where the directions were not completely clear. (Task) To avoid accidents or injury, I knew that I needed to understand the design completely before I started the work. (Action) First, I brought the design to my supervisor and asked her if she could help me to interpret the design. She's a whiz at blueprint reading, and even this one stumped her! Then, I asked a couple of senior colleagues for their interpretation as well. Last, I took our collective thoughts and went to a CNC online forum that I know and trust. (Result) It took some time, but after pulling these resources and collaborating as a team, we were able to crack the code. It felt great to have solved this problem."
Written by Rachelle Enns on August 1st, 2020