Gee Seven Zero: Finish Turning Canned Cycle
So we have used both G71 and G72 to do some magic but we do still have that finish allowance on the bit we just turned (The U and W finishing allowances from line 2 of the canned cycle specifications). It’s time to get that job down to the final size we want but rather than writing all this bullshit out again we have a very simple option.
First lets go back to the original canned cycle:
- G00 X61.0 Z3.0
- G71 U2.0 R0.5
- G71 P100 Q200 U0.5 W0.5 F0.25
- N100 G00 X21.0
- G01 Z0.0
- G01 X25.0 Z-2.0
- G01 Z-25.0
- G01 X40.0
- G01 X50.0 Z-30.0
- G01 Z-75.0
- N200 G01 X60.5
We already have our shape designed (drawn out) in the N100 – N200 lines so lets use it.
- G70 P100 Q200 F0.08
G70 calls up the finishing cycle
P100 calls the start of the shape
Q200 calls the end of the shape
F0.08 sets the feed rate.
Better still we can continue with the SAME tool we just used or write in another entire block using a different tool with the same cutting data.
What will a basic cycle look like with the same data and tool?
- G00 X61.0 Z3.0
- G71 U2.0 R0.5
- G71 P100 Q200 U0.5 W0.5 F0.25
- N100 G00 X21.0
- G01 Z0.0
- G01 X25.0 Z-2.0
- G01 Z-25.0
- G01 X40.0
- G01 X50.0 Z-30.0
- G01 Z-75.0
- N200 G01 X60.5
- G70 P100 Q200 F0.08
So there that is, boom! rough turn and finish in a few lines that anybody can read and no idiot controls involved.