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finish cycle

This G70 code word on a CNC lathe calls a finishing operation after a G71 roughing cycle. This is an automated macro-type contouring cycle that is defined by the same series of XZ coordinates that defined the G71 cycle. The cycle will finish the part as dictated in the code blocks for the roughing cycle.

The P word tells the controller the number of the first block of the contour
The Q word tells the controller the number of the last block of the contour
The F word is the feedrate
The S word is the spindle speed

N500 G70 P120 Q200 S2000 F.012
(see the code that is descibed in the G71 example)

Note the red line in the animation represents the "stay away" zone defined by in the roughing cycle. The finish pass shown is what G70 accomplishses.