G75 Box Contour Roughing Example (G75InUnFnPn)
See also G74: Box Roughing and G78: Rough Contour

The box cycle starts at the current position, then makes cutting passes parallel to the Z axis at a cutting depth no greater than the I value until the last pass which is a U amount off the part.

The area of material that is removed is rounded by the Z and X axis through the tool start point and the contour from A to point B. At the end of the cycle, the tool is returned to the start point.

The location of the contour code:

• If the P code is present, the contour is defined in a subroutine.
• If the P code is not present, the contour is defined in the following blocks until a block with an "RF" code is encountered.

Worked external example for G75

Above is a part that can be roughed. The code that can be used to generate the contour could be: The program code for the contour can be placed immediately after the G75 (inline) or it can be placed in a sub-routine: In either case, the G75 generates the same toolpath: Practically speaking, you'd want to add G74 code to rough out the area behind the arc: