VMC Operator and Setter

VMC Operator and Setter Interview Questions and Answers

Updated 18 Sep 2023

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Q1. How to take center from the edge of a job?

Ans.

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

Ans.

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

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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

Ans.

Mcode and Gcode are programming languages used in CNC machines to control their movements and functions.

Mcode is used to control auxiliary functions such as turning on/off coolant or spindle rotation.
Gcode is used to control the movement of the machine's tool, such as its position, speed, and direction.
Both codes are essential for programming and operating CNC machines.
Examples of Gcode commands include G00 for rapid positioning and G01 for linear interpolation.
Examples of Mc...read more

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Ans.

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.

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Drilling operation involves setting up the machine, selecting the appropriate drill bit, setting the speed and feed rate, and monitoring the process.

Set up the VMC machine by securing the workpiece and selecting the appropriate tool holder.
Select the correct drill bit based on the material being drilled and the desired hole size.
Set the speed and feed rate on the machine control panel according to the material and drill bit specifications.
Start the drilling process and monito...read more

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