M21/M22 Tailstock Advance/Retract (Optional)

Classic Control - Lathe Operator's Manual

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M21 and M22 position the tailstock. M21 uses Settings 106 and 107 to move to the Tailstock Hold Point. M22 uses Setting 105 to move the tailstock to the Retract Point.


ST10 does not use any settings (105, 106, 107).

Adjust pressure using the valves on the HPU (except ST-40, which uses Setting 241 to define hold pressure). For information on proper ST tailstock pressure, refer to Hydraulic Tailstock and Servo Tailstocks.

caution: Do not use an M21 in the program if the tailstock is positioned manually. If this is done, the tailstock backs away from the workpiece and then repositions against the workpiece, which may cause the workpiece to drop.

Set Screw Hold Pressure Valve: [1] Locking knob, [2] Adjustment knob.

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.