How to Be Computer Numerical Control (CNC) Machinist - Job Description, Skills, and Interview Questions

Dec 13, 2023 / 5 Minutes Read / By Albert

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Computer Numerical Control (CNC) Machinists are responsible for operating CNC machines, which are automated machines that are programmed to cut and shape materials such as metal and plastic. The machinists use a variety of tools, including lathes, mills, grinders and drill presses, to create precision parts for a variety of industries. With the help of computers, CNC machinists can create complex shapes with high accuracy and repeatability.

The demand for CNC machinists is on the rise due to the increasing use of automation in manufacturing. As a result, skilled machinists are in high demand, with salaries often exceeding those of traditional manual machinists. CNC machinists must have a strong foundation in mathematics and be familiar with computer-aided design (CAD) software.

they must possess strong troubleshooting skills and an attention to detail to ensure the accuracy of their work.

Steps How to Become

Get a high school diploma or equivalent. Most employers require CNC machinists to have a high school diploma or equivalent.
Consider enrolling in a postsecondary machining program. Postsecondary machining programs can provide students with the skills and knowledge needed to become a CNC machinist.
Obtain on-the-job training. Many employers require CNC machinists to complete on-the-job training before they can work independently.
Earn certifications. Certifications may be available from organizations such as the National Institute for Metalworking Skills (NIMS).
Consider joining a professional organization. Professional organizations such as the National Tooling and Machining Association can provide networking opportunities, job postings, and other resources for CNC machinists.
Obtain additional experience or education. Advanced certifications and/or additional experience may be needed to move into higher-level positions.

As a CNC Machinist, it is essential to stay up to date and efficient to ensure the quality of the product produced. Keeping up with the latest technologies, reading industry related magazines and attending trade shows and conferences are some of the ways to stay informed. Regularly attending training sessions and workshops can help to keep one's skills sharp and up-to-date.

it is important to know the proper tools, machines and processes to help remain efficient and accurate in production. Having a good working knowledge of CNC programming languages and software will help ensure that projects are completed with accuracy and in a timely manner. Finally, it is important to have a good working knowledge of safety protocols and procedures to ensure the safety of oneself and others in the workplace.

By staying informed, up-to-date and efficient, CNC Machinists can ensure their work is of the highest quality.

You may want to check Fabrication Machinist, Grinder Machinist, and Maintenance Machinist for alternative.

Job Description

Operate CNC machines to produce precision parts and instruments
Follow blueprints to produce parts with exacting dimensions
Adjust machine controls to regulate speed, feed, coolant flow, and depth and angle of cut
Monitor machine while working to adjust as necessary and to detect malfunctions
Select and install cutting tools, tool holders and fixtures according to job specifications
Load programs into CNC machines
Inspect finished parts for accuracy and conformance to specifications
Make adjustments and replace worn parts as necessary
Perform routine maintenance on machines
Keep detailed production records and logs

Skills and Competencies to Have

Knowledge of CNC machining principles and processes
Ability to read and interpret blueprints, technical drawings, schematics, and computer-aided design (CAD) files
Ability to set up and operate CNC machines, including loading programs and making necessary adjustments
Ability to select the appropriate tools and materials for a specific job
Knowledge of the machining process, including cutting speeds and feeds
Ability to perform basic maintenance, troubleshooting, and repairs on CNC machines
Excellent hand-eye coordination, manual dexterity, and strong problem-solving skills
Ability to work with a high degree of accuracy and precision
Ability to work independently or as part of a team
Understanding of safety protocols when operating CNC machines

Computer Numerical Control (CNC) Machinists are highly skilled professionals who are responsible for manufacturing complex parts and components using automated machines. A CNC Machinist must have a high level of knowledge and expertise in order to operate the machine correctly, safely, and efficiently. The most important skill for a CNC Machinist to possess is the ability to read and understand blueprints and technical drawings.

This is because these drawings contain detailed instructions on how the machine should be set up and operated. CNC machinists must have strong problem solving skills and attention to detail in order to identify errors and quickly make corrections. Computer programming knowledge is also essential in order to ensure the machine is running properly.

With the right knowledge and expertise, CNC machinists are able to produce high quality parts and components while meeting tight deadlines.

Welding Machinist, Assembly Machinist, and Mill Machinist are related jobs you may like.

Frequent Interview Questions

What experience do you have operating CNC Machines?
Are you familiar with the programming language associated with CNC Machines?
What is your experience with troubleshooting CNC Machines?
How do you ensure accuracy when setting up a CNC Machine?
What safety protocols do you follow when operating a CNC Machine?
What experience do you have working with CAM software?
How do you verify that a CNC program is running correctly?
Describe a time when you had to solve a complex problem involving a CNC machine.
How do you ensure that the correct raw materials are used for each CNC job?
How do you handle unexpected changes to the CNC program during production runs?

Common Tools in Industry

Lathe. A machine tool used to shape metal, wood, or plastic by rotating a workpiece around an axis of rotation. (eg: CNC Lathe)
Milling Machine. A machine tool used to shape metal or wood by removing material with a rotating cutting tool. (eg: CNC Milling Machine)
Grinder. A machine tool used to grind material to a desired shape or size. (eg: CNC Surface Grinder)
Drill Press. A machine used to drill holes in material. (eg: CNC Drill Press)
Saw. A machine used to cut material into desired shapes. (eg: CNC Band Saw)
Router. A machine used to route material along a path. (eg: CNC Router)
Bender. A machine used to bend material into desired shapes. (eg: CNC Tube Bender)

Professional Organizations to Know

National Tooling and Machining Association (NTMA)
Society of Manufacturing Engineers (SME)
Association for Manufacturing Technology (AMT)
International Association of Machinists and Aerospace Workers (IAMAW)
Tooling and Manufacturing Association (TMA)
American Machine Tool Distributors Association (AMTDA)
National Institute for Metalworking Skills (NIMS)
The CNC Machines Users Group (CNCMUG)
International Machine Tool Show (IMTS)
National Robotics League (NRL)

We also have Laser Machinist, Quality Control Machinist, and Lathe Machinist jobs reports.

Common Important Terms

CAD/CAM. Computer Aided Design/Computer Aided Manufacturing. This is the main software used in CNC machining to design and create the necessary toolpaths for the machine to follow.
Toolpath. The path a CNC machine will follow when cutting a part. This is determined by the CAD/CAM software and may be either manual or automated.
G-Code. A programming language used to control the motion of a CNC machine. It is generated from the CAD/CAM software and can be edited by the machinist to make adjustments to the toolpath.
Machining Center. A type of CNC machine with multiple axes of motion, allowing for more complex operations.
Lathe. A type of CNC machine used to shape pieces of material by rotating a workpiece against a cutting tool.
Workholding. The process of securely holding a workpiece in place while machining. This can involve clamps, vises, or other specialized fixtures.
Fixtures. Specialized tools used to secure a workpiece in place while machining.
Coolant. A liquid used to cool the cutting tool and prevent heat buildup. This can also be used to flush chips away from the cutting area.

Frequently Asked Questions

Q1: What is a CNC Machinist? A1: A CNC Machinist is an individual who is trained to operate and program computer numerical control (CNC) machines. CNC machines are automated machines that can produce precise parts and components with a high degree of accuracy. Q2: What is the job of a CNC Machinist? A2: The job of a CNC Machinist is to operate and program CNC machines, checking for correct settings, calibrating the machines, and ensuring the quality of the parts produced. CNC Machinists also inspect parts for accuracy and troubleshoot any issues that arise. Q3: What skills are required to be a CNC Machinist? A3: To be a successful CNC Machinist, one must have strong mechanical aptitude, strong computer skills, good spatial awareness, and a knowledge of mathematics, especially geometry. Additionally, CNC Machinists should have problem-solving skills and the ability to read and interpret blueprints. Q4: What tools do CNC Machinists use? A4: CNC Machinists use a variety of tools, including computers, lathes, milling machines, grinders, drills, saws, and other specialized machinery. Additionally, they may use precision measuring instruments such as calipers and micrometers to check the accuracy of the parts they produce. Q5: What is the average salary of a CNC Machinist? A5: The average salary of a CNC Machinist in the US is $46,878 per year. Salaries can vary depending on experience, location, and other factors.