Wire EDM Machine Operation Chapter 7
Copyright November, 98 Page 7-3 Sodick Inc.
OFFSET VALUE
In the initialization block, you will include an “H” word. This specifies the register the
control will use in the offset file. The H word tells the control how far to keep the wire
away from all surfaces to be cut. For example, if you needed an offset of .0062", it would
be programmed with the H word as H062. Use the following table as a guide, based on
the DIGIT parameter setting in the “SET” “TRAVEL” screen.
4 Digit inch offsets 5 Digit inch offsets Actual amount
H089 H890 .00890
H052 H520 .00520
Driving the wire around the shape
Now that wire radius compensation is properly instated, you will simply program the part
coordinates to drive the wire through its programmed path to cut the workpiece.
CANCELING WIRE RADIUS COMPENSATION
When you are finished with your cutting movements, you MUST remember to cancel the
wire radius compensation (with G40). It is important that you do so in a straight line
cutting command (not G02 or G03). At the end of the cancellation command, the wire’s
centerline will be on the programmed end point of the command.
“APPROACH PATTERN” PARAMETER
The parameter “Approach Pattern” in the “SET” “TRAVEL” screen affects the way in
which the offset is instated on the first move and how it’s cancelled on the last move. It is
recommended that the parameter be set to 1. The figure 7-2 shows the affect it has on
these moves. When “Approach Pattern” is set to 1, the wire approaches at a right angle
to the surface to be offset from. If the parameter is set to 0, then the offset value is
applied and cancelled along the length of the initialization move.
Figure 7-2
Approach Pattern = 1
G41 H062
G01 Y-.250
Approach Pattern = 0
G41 H062
G01 Y-.250
"Approach Pattern" And Wire Offset Initialization
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