G71 I.D. Stock Removal Example

Classic Control - Lathe Operator's Manual

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note: Make sure the start position of the tool is positioned below the diameter of the part you wish to start roughing out, before you define a G71 on an I.D. with this cycle.

G71 I.D. Stock Removal Example

note: This example program and illustration assume that the workpiece starts with a 0.75" through-hole for the boring bar to enter.
% o60713 (G71 ID ROUGHING) ; (G54 X0 is at the center of rotation) ; (Z0 is on the face of the part) ; (T1 is an ID cutting tool) ; (BEGIN PREPARATION BLOCKS) ; T101 (Select tool and offset 1) ; G00 G18 G20 G40 G80 G99 (Safe startup) ; G50 S1000 (Limit spindle to 1000 RPM) ; G97 S500 M03 (CSS off, spindle on CW) ; G00 G54 X0.7 Z0.1 (Rapid to clear position) ; M08 (Coolant on) ; (BEGIN CUTTING BLOCKS) ; G71 P1 Q2 U-0.01 W0.002 D0.08 F0.01 (Begin G71) ; (Negative U indicates ID roughing) ; N1 G00 X4.1 Z0.1 (P1 - Begin toolpath) ; G01 Z0 ; X3. ,R.25 F.005 ; Z-1.75 ,R.5 ; X1.5 ,R.125 ; Z-2.25 ,R.125 ; X.75 ,R.125 ; Z-2.375 ; N2 X0.73 (Q2 - End of toolpath); G70 P1 Q2 ; (BEGIN COMPLETION BLOCKS) ; G00 G53 X0 M09 (X home, coolant off) ; G53 Z0 M05 (Z home, spindle off) ; M30 (End program) ; %

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