Wire EDM Machine Operation Chapter 3
Copyright November, 98 Page 3-1 Sodick Inc.
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Part of the second key concept involves understanding something called “program zero”.
This feature allows the programmer to choose a convenient point to work from.
You, as the operator / programmer, have total control of where you would like your
program zero point to be. Some EDM operators like to choose the start point of the wire
as their program zero point. But a much more logical program zero point would be the
point on the part print where all (or most) of the dimensions are coming from. Using this
technique, dimensions going into the program will match the dimensions on the print.
When you work from program zero, it is called working in the “absolute” mode of
programming. That is, all dimensions come absolutely from program zero. This differs
from another style of programming called incremental programming, where each position
is taken from the last position of the wire (not from program zero).
Here are two drawings that show how to determine your program zero point:
Figure 3-1
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