
2 - 28 Basic NC G Codes
704-0115-307
WinMax Lathe NC Programming
Turn Threading - Inner Diameter and Outer Diameter
The type of thread cut (Inner or Outer Diameter) is defined by the signs of the X and J
parameters. The X parameter specifies the radius or diameter at the start of the final
thread pass. The J parameter specifies the total depth of the thread.
•
If X and J are of the same sign (both positive or both negative), an OD
(outer diameter or external) thread cut will be implemented.
•
If X and J are of the opposite sign (one positive and one negative), an ID
(inner diameter or internal) thread cut will be implemented.
Clearance, Lead In and Lead Out Parameters
These parameters have default values and may not need to be programmed.
Example—OD Thread with Offsets U and W
The following figure illustrates the use of U (X return clearance) and W (Z clearance)
parameters:
Figure 2–12. OD Thread with Offsets U and W Example
If the sign of X+J is not the same as the sign of X, the macro is
aborted. The X-axis is not allowed to cross the spindle centerline
when cycling a threading macro.
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