80 96-8000
June 1999
OPERATION
3.5 PROGRAMMING W ITH C ODES
A program is written as a set of instructions given in the order they are to be performed. The instructions, if
given in English, might look like this:
LINE #1 = SELECT CUTTING TOOL.
LINE #2 = TURN THE SPINDLE ON AND SELECT THE RPM.
LINE #3 = TURN THE COOLANT ON.
LINE #4 = RAPID TO THE STARTING POSITION OF THE PART.
LINE #5 = CHOOSE THE PROPER FEED RATE AND MAKE THE CUT(S).
LINE #6 = TURN OFF THE SPINDLE AND THE COOLANT.
LINE #7 = RETURN TOOL TO HOLDING POSITION AND SELECT NEXT TOOL.
and so on. But our machine control understands only these messages when given in machine code.
Before considering the meaning and the use of codes, it is helpful to lay down a few guidelines:
1) Codes come in groups. Each group has an alphabetical address. The universal rule here is that
except for G codes and macro calls, Codes with the same alphabetical address cannot be used
more than once on the same line.
2) G codes come in groups. Each G code group has a specific group number. G codes from the
same group cannot be used more than once on the same line.
3) There are modal G codes groups which, once established, remain effective until replaced with
another code from the same group.
4) There are non-modal G codes groups which, once called, are effective only in the calling block, and
are immediately forgotten by the control.
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