VMC Operator and Setter Interview Questions and Answers

To take center from the edge of a job, use a dial test indicator to find the edge, then move half the distance to locate the center.

• Use a dial test indicator to locate the edge of the job accurately.

• Once the edge is found, move the indicator half the distance towards the center to find the center point.

• Repeat the process from different edges to ensure accuracy in locating the center of the job.

• Adjust the position of the job on the VMC accordingly to align the center with the ...read more

Program matching on any profile involves ensuring the program is compatible with the machine's capabilities and specifications.

• Understand the machine's capabilities and specifications

• Analyze the program code to ensure it is compatible with the machine

• Make necessary adjustments to the program if needed

• Test the program on the machine to ensure proper functioning

In my last company, I used a variety of instruments including Vernier calipers, micrometers, height gauges, and dial indicators for precision measurements in VMC operations.

• Used Vernier calipers for measuring external dimensions accurately

• Utilized micrometers for precise measurements of small components

• Operated height gauges to measure vertical distances

• Used dial indicators for checking runout and alignment of components

G80, G43, G49 are G-codes used in CNC machining to control various functions such as tool length compensation and tool radius compensation.

• G80 is used to cancel any canned cycle mode

• G43 is used for tool length compensation

• G49 is used to cancel tool length compensation

• G-codes are standardized codes used in CNC programming to control machine functions

Ball nose and bullnose are types of milling cutters used in CNC machining.

• Ball nose cutters have a rounded tip and are used for 3D contouring and finishing.

• Bullnose cutters have a flat tip and are used for creating fillets and chamfers.

• Ball nose cutters are more versatile than bullnose cutters.

• Bullnose cutters are more efficient for roughing operations.

• Both types of cutters are available in various sizes and materials.

BORING CYCLE G code is used to control the boring operation on a CNC machine.

• BORING CYCLE G code is used to specify the parameters for boring operations such as feed rate, spindle speed, and depth of cut.

• It is important to understand the specific G codes for boring cycles such as G85, G86, G87, and G88.

• Example: G85 is used for boring with a single feed rate, while G86 is used for boring with a dwell at the bottom of the hole.