Exercise 4 (3rd Sept 2024)

Which command in the program is used to start the spindle?

• • A) M08

• • B) M03

• • C) M06

• D) M05

Which part of the program ensures the tool retracts to a safe height after completing the profile?

• G00 Z10 M09

• • G01 Z-5 F100

• G03 X30 Y30 R10

• G43 Z10 S1500 M03

In the program, what movement does the command G03 X30 Y30 R10 represent?

• • A) A linear move to Coordinate 3

• • B) A counter-clockwise arc with a 10 mm radius

• • C) A clockwise arc with a 10 mm radius

• D) A rapid move to Coordinate 3

What is the function of G90 in this CNC program?

• • A) Select the XY plane

• • B) Set incremental command

• • C) Set absolute command

• D) Set the units to millimeters

Why is setting the correct feed rate important in a CNC milling program?

• • A) It controls the depth of cut.

• • B) It determines the color of the chips produced during cutting.

• • C) It affects the cutting speed and ensures the tool doesn't wear out too quickly.

• D) It sets the spindle speed for optimal cutting.

Why is M08 used in this CNC program, and what would likely happen if it were omitted?

• • A) It starts the spindle; omitting it would prevent the spindle from rotating.

• • B) It determines the color of the chips produced during cutting.

• • C) It turns on the coolant; omitting it could lead to overheating of the tool.

• D) It sets the feed rate; omitting it would result in an unspecified feed rate.

Which command is responsible for determining the path offset for the cutting tool relative to the programmed coordinates in this CNC program?

• • A) G17

• • B) G41

• • C) G43

• D) G90

Which combination of commands initiates tool length compensation and sets the spindle speed in this program?

• • A) G41 D01

• • B) G43 Z10 S1500 M03

• • C) G00 X10 Y-10

• D) G21 G17 G90

What is the significance of the G49 command in the context of this CNC program's operations?

• • A) It cancels tool diameter compensation, ensuring the tool moves to the exact coordinates.

• • B) It cancels tool length compensation, resetting the tool’s height reference.

• • C) It ends the program by stopping all movements.

• D) It sets the feed rate to a default value.

Which aspect of the program could lead to incorrect machining if the G40 command is not included at the right time?

• • A) The tool would not retract to a safe height, causing potential damage.

• • B) The tool would not properly follow the programmed path, leading to dimensional inaccuracies.

• • C) The coolant would not turn off, affecting subsequent operations.

• D) The spindle would not stop, posing a safety hazard.