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Top 20 CNC Operator Interview Questions

How much more did you learn at your first job that your training didn't teach you?
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Question 2 of 23
What is a vernier?
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"From my understanding, a vernier is a small movable graduated scale for obtaining fractional parts of subdivisions on a fixed main scale of a barometer, sextant, or other measuring instrument."
Answer this briefly and matter of factly.
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Question 3 of 23
What are the CN languages?
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"G-Code is the number one language used to instruct CNC machining devices what motions they need to perform such as work coordinates, canned cycles, and multiple repetitive cycles. Industry has standardized on G-Code as its basic set of CNC machine codes so this is what I am trained in. Are there other languages you would prefer that I know?"
How you answer this will show the hiring manager how well versed and up to date you are within the industry. Answer briefly, giving an example of the language(s) that you are most familiar with.
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Question 4 of 23
What is a micrometer?
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"A micrometer is a gauge that measures small distances or thicknesses between its two faces, one of which can be moved away from or toward the other by turning a screw with a fine thread."
Answer this briefly and matter of factly.
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Question 5 of 23
How many sixteenths are in an inch?
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Question 6 of 23
What makes you want to be a CNC Operator?
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Question 7 of 23
Whats the reason you applied to work at our shop?
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Question 8 of 23
How well have you adapted to a machine you were unfamiliar with?
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Question 9 of 23
What challenges do you sometimes face while operating your machine?
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Question 10 of 23
What was the toughest part you created as a CNC Operator?
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Question 11 of 23
Have you ever messed up a part that cost your company a significant amount of money? What happened?
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Question 12 of 23
What was your most difficult challenge while operating a machine?
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Question 13 of 23
What CNC equipment have you worked with before?
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Question 14 of 23
How much time in your career, have you spent operating a CNC machine?
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Question 15 of 23
How was your education? How well did it prepare you for your first job?
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Question 16 of 23
What versions of CAM do you know?
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Question 17 of 23
Which machine do you have the most experience working on?
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Question 18 of 23
How long have you been a CNC Operator?
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Question 19 of 23
What do you know about our company and what we manufacture?
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Question 20 of 23
Tell me about a time when you met a tough deadline.
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Question 21 of 23
Where did you learn to be a CNC Operator? Have you ever thought about more training?
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Question 22 of 23
Have you ever had an engineer design a part that you could not understand/read their directions? How did you overcome this obstacle?
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Question 23 of 23
What did you dislike the most about your last shop?
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User-Submitted Interview Answers

Question 1 of 23
How much more did you learn at your first job that your training didn't teach you?
User-Submitted Answers
1.
Maximum I didnot get.
2.
Knowledge about operations quality and more.
3.
I will ask before trying by myself.
4.
It was more of the reverse. I learned much more about the CNC operation from training. It offered me a better understanding of how the total machine process works.
5.
I learned a lot from my first job that teaches much more than I expected but I finally figure3d it out there is much more to learn.
6.
I have gain a lot which I never think about in my early days.
7.
I learnt a lot from my training.
8.
Quite a bit actually. I feel like I didn't get trained very well. My trainee was only around for two days then I was on my own.
9.
I learn more while performing a first job . How to use cnc.
10.
Not much. Tribal knowledge.
11.
My Trainer was very forward and valuable.
12.
Calipers, gauges, touch tool.
13.
I learned many things which were skipped during training period like machine structure, work environment, production considerations according to standards etc. And much more.
14.
1.Regarding the tool seslection 2.Cutting parmeter 3. Overall ssetting.
15.
I learnt that not everything is solved by knowledge learnt at colleger and how powerfull on the job training is.
Question 2 of 23
What is a vernier?
User-Submitted Answers
1.
It is a measuring instrument for measuring parts of a work piece.
2.
Something you can measure pices/items with. Mostly no tolerated measures.
3.
It is a measuring instrument .
4.
To my knowledge it usually refers to a specific style of calipers, but whats different is they don't use a dial or an electronic gauge, but have something more like a scale to read measurements.
5.
It is a short scale made to slide along the divisions of a graduated instrument for indicating parts of divisions.
6.
It is a measuring device.
7.
Measurement used to measure deep hole, outside and inside of a work face.
8.
Vernier is a musering insument.
9.
A scale used for measuring the internal and external diameters of an object.
10.
Vernier is instrument to find out accurcy.
11.
Vernier is an instrument used to measure linear measurements with an accuracy of 0.2mm.
12.
An instrument for measuring length as well as thickness of material.
13.
Vernier used to measure depth, od and id.
14.
A small movable graduated scale for obtaining fractional parts of subdivisions on a fixed main scale of a barometer, sextant, or other measuring instrument.
15.
Is the measuring tool that is accurate to measure workpiece.
Question 3 of 23
What are the CN languages?
User-Submitted Answers
1.
Computerized numerical.
2.
Turning inset radius.
3.
Computer numrical lagwag.
4.
Compiuterized numerical language is a language used to program cn machine. It provide geometrical coordinate and cut parameters as cutting speed and spindle speed.
5.
Computer numerical language.
6.
It is used to measure the lenght and thickness of an object.
7.
There are some cn languges are like g code.
8.
Machine languages for programming.
9.
G-Code is one of a number of computer code languages that are used to instruct CNC machining devices what motions they need to perform such as work coordinates, canned cycles, and multiple repetitive cycles. Industry has standardized on G-Code as its basic set of CNC machine codes.
10.
It is the programming language originated from china.
11.
Cn language is a summation of algebraic sum letter & alphabet.
12.
CN langauges means Computer Numerical Languages.
13.
Language localisation is the process of adapting a product that has been previously translated into multiple languages to a specific country or region (from Latin locus (place) and the English term locale, "a place where something happens or is set").[1] It is the second phase of a larger process of product translation and cultural adaptation (for specific countries, regions or groups) to account for differences in distinct markets, a process known as internationalization and localization.
14.
Cn are the computer numeric languages.
15.
Commands written to run the different operations.
Question 4 of 23
What is a micrometer?
User-Submitted Answers
1.
An instrument for measuring length as well as thickness of material.
2.
To measume the different tools.
3.
A micrometer is a precision tool that you would use to check dimensions, most likely a diameter.
4.
It's a tool used for measuring parts all the way down to tenths of a thousandth of an inch.
5.
Is a gauge which measure small distance or thicknesses between two faces.
6.
It is a measuring device.
7.
Micrometer is chacking instument.
8.
A measuring tool used to check roundness.
9.
A micrometer is a precision instrument used to measure a job, generallywith an accuracy of 0.01mm.
10.
A micrometer is a precision instrument used to measure a job, generally with an accuracy of 0.01mm.
11.
Instrument for measure ID OD thicknesses.
12.
It is an instrument used to measure linear dimensions with an accuracy of 0.01mm.
13.
An instrument for measuring length as well as thickness of material.
14.
Micrometer used to measure outer dia of an object.
15.
Instrument for measuring length as well as thickness of material.
Question 5 of 23
How many sixteenths are in an inch?
User-Submitted Answers
1.
There are 16 1/16s of an inch in one inch. Dividing one by 1/16 gives the answer 16. Dividing fractions requires multiplying the divisor by the reciprocal of the dividend, so dividing one by 1/16 is the same as multiplying one by 16.
Question 6 of 23
What makes you want to be a CNC Operator?
User-Submitted Answers
1.
I can make almost any part I want. Wonterful machines with many capabilities..
2.
Machine, tools/ I like to use all this thing.
3.
I was in the HVAC industry and they wanted two or more years experience. I swicthed voer to this for this was similar and easier to get you foot into the door somewhere.
4.
I always had an interest in the mechanical field and aviation area.The CNC field is ever changing and you could be working with cars one day then aviation the next.
5.
Like the challenge of producing something complex.
6.
Jobs are in demand for this field, stable, long term employment.
7.
Knowledge and uses of operations, insert specifications, material and machine specifications.
8.
To earn money and have a good job with knoledge.
9.
The opportunity to have a career that has so many open ended possibilities. It is a career that could help me make parts for my car, house, or tools to help aid in other projects.
10.
I really like this occupation, with the experience I received in school, I have gained the knowledge and skills to succeed.
11.
I am good with machines can control the entire machine.
12.
Learn about tooling for manufacturing /production.
13.
I can make almost all the part according to the need.
14.
All types of drilling and finnishishing product.
15.
I want to better myself to benefit my house hold. Along with the company to make better progress.
Question 7 of 23
Whats the reason you applied to work at our shop?
User-Submitted Answers
1.
To gain a hands on experience in order to be part of your competent team.
2.
I want to pursue my career in manufacturing industry and I want to work for such a reputed company like abc.
3.
To gain some knowledge, to produce something with my previous gaining.
4.
Want to be more exploring in this field.
5.
I want to go for production from cnc.
6.
I heard this is a great company that offers good pay, great benefits, and room to advance.
7.
I have two reasons. First I heard you're one of the larger machining companies to join. Second I enjoy machining.
8.
To work for a strong company in hope of making a life out of the company .
9.
I want to pursue my career in manufacturing industry and I want to work for such a reputed company like abc. 0%
10.
Great environment, and the Quality culture.
11.
I enjoy new challenges and would love to be back on CNC
12.
I want to be part of this company, to contribute with my knoledge.
13.
I am interested in development and increasing my skills by using my knowledge in your shop with new products.
14.
To improve my skills and put the skills that I already have into use.
15.
I was informed by a previous supervisor of your guy's operations and how you guys are growing rapidly it feels like a secure company that I look forward to growing with.
Question 8 of 23
How well have you adapted to a machine you were unfamiliar with?
User-Submitted Answers
1.
Try to learn it quick.
2.
Try to learn it quick.
3.
I try my best to learn about new machine quickly because I am a good learner.
4.
Caliper micrometer dep mic. Indykator,
5.
I learn about the machine quickly since I am a fast learner.
6.
Learn about g codes in particular machine, machine features, and special tools.
7.
I have adapted very well. I am a fast leaner and I am very compitent.
8.
I adapted really well with the machine I am unfamiliar with.
9.
I am well adopted with automated lathe I loved it most I am unfamilar with VMC
10.
Actually I got trained from my supervisor at my previous company.
11.
I would like to believe that I do pretty well. I am a very fast learner so I pick up on it fairly quick. There will obviosly be a few hick-ups, but nothing that cant get fixed.
12.
I actually adapted to new machines fairly well.
13.
I would be good in adapting to different machines.
14.
First I learn fully about the machine . And think what are the change can possible and makes the machine familiar with me.
15.
I was able to adapt very well to new platforms and types of machines. Machining is machining.
Question 9 of 23
What challenges do you sometimes face while operating your machine?
User-Submitted Answers
1.
If I have the right machine and the right tools, no challenge.
2.
Yes I challenge while operting machine.
3.
Higher growth satisfaction.
4.
Trying to reduce product time.
5.
Make the product's good.
6.
What challenges do you sometimes face while operating your machine?
7.
Making accurate operation.
8.
No challenges with the right machine and the right tools available.
9.
PIcking the right order of operations in conventional milling or correcting gcode errors in CNC programming.
10.
Usually the challenges are pretty trivial, for example, I might cut a piece two hundred thou too short because I forgot to account for something.
11.
IfI have right machine and right tool, no challenge.
12.
New tools and searching for the right part of the code to start and stop from.
13.
To deal with machines where I have to play as a mechanich too.
14.
Program error and sometimes machine's malfunctioning due to wear parts and program errors.
15.
Some times the machine loses its timings and the qulity of the componets is affectted.
Question 10 of 23
What was the toughest part you created as a CNC Operator?
User-Submitted Answers
1.
Impossible to understand.
2.
Lathe Part with internal and external threads.
3.
Helicopter handle in my earlier period.
4.
Its cnc operator never complited.
5.
The toughest part I made as a CNC operator was a set of wrenches.
6.
As of right now it would be a test part labeled as Lathe Chucking project.
7.
Snow mobile part, from a broken part.
8.
AR lowers and bolt carriers.
9.
To learn to operate 5 axes machines.
10.
Multitasking on one work including almost all operations a cnc can perform.
11.
Fixture to hold stirling engine top plate.
12.
It was to finish the spark eroded gates on a 48 cavity mould for medical filters on an EDM machine.
13.
Lathe part with internal and external threads.
Question 11 of 23
Have you ever messed up a part that cost your company a significant amount of money? What happened?
User-Submitted Answers
1.
Anyone who has worked as a setter-operator and says they have never messed up are liars.
2.
What is mean by absolute mode.
3.
No. I have had a CNC crash only once due to the part being mis-located.
4.
I have messed up a part ilearned from mistake and payed closer attention to what I did in the future.
5.
The part itself no but the tool and holder yes. The shoulder bolt was tightened all the way down but the clamp above it sat on a lip on the part and when the mill came in it tore the part and the tool out damaging not only the part and tool but the holder.
6.
No, because first we use simulation and prototyping after that we start actual production.
7.
I have messed up some times but it did not cost the company any thing becouse I maneged to identfy the problem early.
Question 12 of 23
What was your most difficult challenge while operating a machine?
User-Submitted Answers
1.
To control the quality combined with reduced cycle time.
2.
Dealing with it after a crash.
3.
A big program to control time and accuracy and judging the ryt tool with ryt material.
4.
Dialing tooling hole for the first time.
5.
Making sure the machine or tool doesn't crash while I am in hand jog mode.
6.
The most difficult challenge was making sure the machine does not crash, or when your in hand jog you have the fear your going too fast.
7.
Having difficulty keeping dimensions/tolerances in spec due to an internal machine problem.
8.
One of the most difficult challenges are the safety and manufacturing guidelines.
9.
The complete set up before use.
10.
Going from 0 knowledge to right in the think of CNC operating.
11.
When programmers give you bad information.
12.
EDM wiring holes over 80 mm high parallel to a ground face with 0 tolerances on position and diameter.
13.
To control the quality combined with reduced cycle time.
Question 13 of 23
What CNC equipment have you worked with before?
User-Submitted Answers
1.
Deckel fp4 dialog11, dmc635 sinumeric 840d.
2.
Vertical milling centre.
3.
Cnc lathe surface finised.
4.
Cnc mill lathe engine lathe bridgeport mill.
5.
Alot machine with fanuc control and cam added programs...
6.
Vertical milling center.
7.
Height gauge, dial gauge and digital tool height.
8.
Hardinge, Haas, Hurco, Olaffsen, Saginaw, and Junker.
9.
Cnc milling 3 axis machines and jigs and fixtures.
10.
CNC Hass Milling Machine, CNC Hass Lathe, Bridgeport Mill.
11.
I have only worked with vertical milling center and the turning machine.
12.
Multi cam, bridgeport, centroid, okk.
13.
I have worked with the VMC (Vertical Machining Center) and the lathe turning machine.
14.
Tsugami automated lathe with fanuc operating system.
15.
I had been working on a SPM
Question 14 of 23
How much time in your career, have you spent operating a CNC machine?
User-Submitted Answers
1.
Entry level I haven't spent anytime with a cnc mechine.
Question 15 of 23
How was your education? How well did it prepare you for your first job?
User-Submitted Answers
1.
Highschool, technical school, bad prepared.
2.
My father was engeeiner.
3.
Diploma mechanical engg.
4.
My education was very well, As far a preparation for the first job I believe it prepared me very well for my first job for CNC operator.
5.
Didnt prepare at all. Actually showed up to my interview straight from a football game with grass stains on my clothes. I got the job!
6.
It helped quite a bit. Mainly giving me a complete understanding of machining processes.
7.
Quit difficult to work as a professional in beginnings then pick up the line as a skilled.
8.
I am currently doing BE in Biotechnology and have an average score of 75%
9.
It was pretty good, I learned a lot, and it prepared me fairly well.
10.
Nothing prepared me for my job.
11.
It was helpfull and esential.
12.
I have a hnc in mechinical engineering . I prepared very well becouse it was an oppotunity for me to apply the knowledge that I accured at college.
13.
Educated to secondary school level. Not very well.
14.
Maths was a great help for trigonometry to aid programming.
15.
I started in an entry level position always grew in areas needed and took the classes necessary to excel in the maintenance field.
Question 16 of 23
What versions of CAM do you know?
Question 17 of 23
Which machine do you have the most experience working on?
User-Submitted Answers
1.
Haas Mills and Lathes.
2.
Haas mills (fanus controlls), mazak lathes iso and mazatrol conversational.
3.
Wrappers, baggers, packaging, conveyors, carton sealers, carton makers, coders, case sealers.
Question 18 of 23
How long have you been a CNC Operator?
User-Submitted Answers
1.
It will depend on my ability and background situation if I feel good by myself I can work more than 12 hour but I feel bad that work become tedious to me.
2.
I have one year of in school experience.
3.
No prior experience entry level position.
Question 19 of 23
What do you know about our company and what we manufacture?
User-Submitted Answers
1.
You work for boeing and the military, you also manufacture aviation parts.
2.
In your company had manufacture such as interior designs etc.,
3.
Production of good high quality.
4.
That it started in **** and you create cool things with a very tight tolerance.
5.
You are one of the leading company in india. You manufacture shaft and axis.
6.
I have friends that work there and have been on a tour. Though I enjoy all things military and knowing what products you produce only helps me understand more about you.
7.
I no that its a familly bussiness which stareted in 1816, it specilieses in making feniture for the houses such as wadrops.
8.
You make a variety of products for communication purposes.
9.
I know you guys specialize in car parts and are growing rapidly and quality is very important to you guys.
Question 20 of 23
Tell me about a time when you met a tough deadline.
User-Submitted Answers
1.
Ya its been the time when the stock at general motor USA or going to end and there are only two options for us whether increse our resources to meet the demand or loose the order.I took the lead because I am lokng these line I increase the production by mjaking programm easier an decresing the clamping dwel and also I myself run the line in break hours..
2.
Working towards deadlines brings out the best in me and am driven by the chellenge.
3.
A good time to show our skill.
4.
In class my partner and I had a project to get done within a 2 week deadline and into the second week we had to start completely over but we still got it done within the time that was given to us..
5.
Repide cnc proramar.
6.
We were running very close to dropping the assembly line due to a CNC machine breaking down. Once the machine was repaired I began producing parts and avoided causing a downtime situation on the assembly line.
7.
My last term, finishing 2 parts in less than 1 week where I had to make my own blue print, g code, and operate the machines.
8.
This is situation will not arise .
9.
I worked in a production shop so we really didn't have one.
10.
When I was college assignments and as a worker we had to make tough dead line becouse of some michine breakdowns.
11.
When producing parts for students projects suc as the stirling engine.
12.
We worked 12 HR shifts for a week to meet a tight delivery date of medical implants.
13.
I had to work an extra 8 hours to meet safety specs on the wrappers installing magnets on the doors to pass the gmp and osha audit the following day.
Question 21 of 23
Where did you learn to be a CNC Operator? Have you ever thought about more training?
User-Submitted Answers
1.
Define term (tap drill)
2.
Macomb Community College Fast Track Program. Yes I thought about going back to school to become a CNC Programer.
3.
From college during my studies.
4.
I did diploma in mechanical engineering drafting and I have one course for cnc also.
5.
I learned it in technical school and hope for further training.
6.
Erie Institute of Technology, and yes I have thought about more training, and I am still considering it.
7.
Self learnig through youtube.
8.
Sig Sauer and yes all the time. I would love to go to school for it.
9.
I went to college to train as a cnc operator and I am looking forward to advance to hnd if I have the oppotunity.
10.
I learn on the job and had one day training with xyz machine tools.
11.
Ya, precision engineering course in limerick institute of technology.
12.
No prior experience willing to learn in and out of work.
13.
I learned CNC operator in college. I always want to think about more training.
Question 22 of 23
Have you ever had an engineer design a part that you could not understand/read their directions? How did you overcome this obstacle?
User-Submitted Answers
1.
Yes auto cad, it took 10 months for me to know completelyt.
2.
No as I am a drafter my self so it will not so hard for me to read blueprints.
3.
No, but if it happened I would bring the question to someone who could answer it.
4.
I search various sources for getting solution . If I could not get it, I move towards my superior.
5.
Yes the bolt carriers I made. I ended up having to have him add a step drill process and slow down the infeed in order to stop melting inserts.
6.
Yes and I had to ask for a full instruction from the engineer and managers.
7.
Yes. I over came this by working with him to rectify the faults.
8.
I got in touch with them to understand what they were looking for and make sure I fully understood myself.
9.
No, I haven't. If I have a problem. I'll rearch resource around me, asking co worker, asking manager, looking through some books.
Question 23 of 23
What did you dislike the most about your last shop?
User-Submitted Answers
1.
Nothing is there to dislike its a matter of intreset.
2.
Sometimes struggled to find the tools I needed for work.
3.
Lake of training and being overly constrained.
4.
I honestly enjoyed my last shop the budget was a little tight so we had to fabricate a lot of parts due to the fact they weren't on the shelf.

About CNC Operator

August 17th, 2017

Numerical control (NC) refers to the automation of machine tools that are operated by abstractly programmed commands encoded on a storage medium, as opposed to manually controlled via handwheels or levers, or mechanically automated via cams alone. The first NC machines were built in the 1940s and '50s, based on existing tools that were modified with motors that moved the controls to follow points fed into the system on punched tape. These early servomechanisms were rapidly augmented with analog and digital computers, creating the modern computed numerically controlled (CNC) machine tools that have revolutionized the manufacturing process.

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