Single-Point Thread Milling Example

Classic Control - Mill Operator's Manual

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This program is for a 1.0" diameter hole with a cutter diameter of .500" and a thread pitch of .125 (8TPI). This program positions itself in Absolute G90 and then switches to G91 Incremental mode on line N7.

The use of an Lxx value on line N10 allows us to repeat the thread milling arc multiple times, with a Single-Point Thread Mill.

% O60025 (G03 SNGL PNT THREAD MILL 1.5-8 UNC) ; (G54 X0 Y0 is at the center of the bore) ; (Z0 is on top of the part) ; (T1 is a .5 in dia thread mill) ; (BEGIN PREPARATION BLOCKS) ; T1 M06 (Select tool 1) ; G00 G90 G40 G49 G54 (Safe startup) ; G00 G54 X0 Y0 (Rapid to 1st position) ; S1000 M03 (Spindle on CW) ; G43 H01 Z0.1 (Activate tool offset 1) ; M08 (Coolant on) ; (BEGIN CUTTING BLOCKS) ; G91 G01 Z-0.5156 F50. (Feed to starting depth) ; (Z-0.5 minus 1/8th of the pitch = Z-0.5156) ; G41 X0.25 Y-0.25 F20. D01 (Cutter comp on) ; G03 X0.25 Y0.25 I0 J0.25 Z0.0156 (Arc into thread) ; (Ramps up by 1/8th of the pitch) ; I-0.5 J0 Z0.125 L5 (Thread cut, repeat 5 times) ; X-0.25 Y0.25 I-0.25 J0 Z0.0156 (Arc out of thread) ; (Ramps up by 1/8th of the pitch) ; G40 G01 X-0.25 Y-0.25 (Cutter comp off) ; (BEGIN COMPLETION BLOCKS) ; G00 Z0.1 M09 (Rapid retract, Coolant off) ; G53 G49 Z0 M05 (Z home, Spindle off) ; G53 Y0 (Y home) ; M30 (End program) ; %

Specific line description:

N5 = XY at the center of the hole

N7 = Thread depth, minus 1/8 pitch. Switches to G91

N8 = Enable Cutter Compensation

N9 = Arcs into thread, ramps up by 1/8 pitch

N10 = Cuts full thread, Z moving up by the pitch value

N11 = Arcs out of thread, ramps up 1/8 pitch

N12 = Cancel Cutter Compensation

N13 = Switches back to G90 Absolute positioning

Be aware: Many service and repair procedures should be done only by authorized personnel. The service technicians at your Haas Factory Outlet (HFO) have the training, experience, and are certified to do these tasks safely and correctly. You should not do machine repair or service procedures unless you are qualified and knowledgeable about the processes.

Danger: Some service procedures can be dangerous or life-threatening. DO NOT attempt a procedure that you do not completely understand. Contact your Haas Factory Outlet (HFO) and schedule a service technician visit if you have any doubts about doing a procedure.