G71 is a 2-line canned cycle for CNC turning that automatically generates multi-pass longitudinal roughing toolpaths from a simple profile definition, drastically reducing program length.
| Direction | OD / ID turning along Z-axis |
|---|---|
| Cycle Type | Longitudinal Rough Turning Cycle |
| Paired Finish Cycle | G70 P100 Q200 (Executes contour finish pass) |
| Controller Compatibility | Fanuc, Haas, Doosan, Mitsubishi |
Line 1 sets the radial depth of cut (U) and retract clearance (R). Line 2 sets the profile start block (P), end block (Q), X/Z finishing allowances (U/W), and roughing feed rate (F).
Reduces hundreds of lines of point-to-point turning code to just 2 lines, simplifying on-machine programming and troubleshooting.
Type I only supports monotonic profiles (non-recessed); Type II includes X and Z in the starting block to handle pockets and undercut profiles.
Call G70 with P and Q block numbers using a dedicated finishing insert to clean up the U and W stock allowance.
