M code 28 Oct 2024

What is the difference between M07 and M08 in terms of coolant control?

• A) M07 turns on flood coolant, and M08 turns on mist coolant

• B) M07 turns on mist coolant, and M08 turns on flood coolant

• C) Both M07 and M08 turn off coolant

• D) Both M07 and M08 turn on mist coolant

Which M-code is typically used to halt coolant flow temporarily in a CNC program?

• A) M07

• B) M08

• C) M09

• D) M98

In what scenario might you use the M98 code in a CNC program?

• A) To turn on mist coolant

• B) To initiate a subprogram for repetitive machining tasks

• C) To stop the machine entirely

• D) To end the main program

If M98 is used to call a subprogram, what additional information is typically required?

• A) The coolant type

• B) The program end command

• C) The subprogram number or name

• D) The tool change code

How does M09 differ from M99?

• A) M09 stops coolant, and M99 returns to the main program

• B) M09 calls a subprogram, and M99 ends the main program

• C) M09 turns on coolant, and M99 stops the machine

• D) M09 ends the main program, and M99 initiates a new one

Which M-code should you use to return to the main program after completing a subprogram?

• A) M07

• B) M08

• C) M09

• D) M99

In a CNC program, where would you typically place M07 or M08 codes?

• A) At the start to initialize the program

• B) After a tool change, to control coolant flow for the specific tool operation

• C) At the very end, to clean up the machine

• D) Directly before M99

What effect does M09 have if used in the middle of a CNC operation?

• A) It will reset the entire program

• B) It will stop the spindle

• C) It will turn off all coolant immediately

• D) It will call a subprogram

If a CNC machine is performing a repetitive task that requires multiple executions of a subprogram, which M-code sequence could be used?

• A) M07 followed by M09

• B) M98 with a loop count parameter

• C) M99 followed by M07

• D) M08 with multiple repetitions

What is a typical use for M99 when not within a subprogram?

• A) To end a loop in the main program

• B) To shut down all coolant

• C) To initialize a tool change

• D) To stop spindle rotation