Programming & Machine Operation Flashcards

What is the purpose of the M03 command in a CNC program?

Answer: Start the spindle in a clockwise direction

M03 starts the spindle in the clockwise (forward) direction, which is the standard direction for most milling and turning operations.

Which M-code is used to activate flood coolant in most CNC controllers?

Answer: M08

M08 activates flood coolant, while M07 activates mist coolant, and M09 turns all coolant off.

A programmer writes 'S1200 M03' in a CNC block. What does the S-word value represent?

Answer: Spindle speed in RPM

The S-word sets the spindle speed in revolutions per minute (RPM) when the machine is in direct RPM mode.

What does G96 mode do in CNC turning?

Answer: Activates constant surface speed (CSS) control

G96 activates Constant Surface Speed mode, automatically adjusting RPM as the tool moves to maintain a consistent surface speed.

When using G97 in a CNC lathe program, what is being commanded?

Answer: Direct RPM spindle speed mode

G97 sets the spindle to direct RPM mode, canceling any G96 constant surface speed that may have been active.

In CNC turning, what does the address 'F0.012' typically specify when programmed in feed-per-revolution mode?

Answer: Feed rate of 0.012 inches per revolution of the spindle

In feed-per-revolution mode (G99), the F-word specifies how far the tool advances per spindle revolution, directly controlling chip thickness.

What is the function of the M30 code at the end of a CNC program?

Answer: End the program and reset the control to the beginning

M30 ends the program, stops the spindle and coolant, and rewinds/resets the control to the program start for the next cycle.