G28 Return to Machine Zero Point (Group 00)

Classic Control - Mill Operator's Manual

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The G28 code returns all axes (X, Y, Z, A and B) simultaneously to the machine zero position when no axis is specified on the G28 line.

Alternatively, when one or more axes locations are specified on the G28 line, G28 will move to the specified locations and then to machine zero. This is called the G29 reference point; it is saved automatically for optional use in G29.

G28 also cancels tool length offsets.

% G28 G90 X0 Y0 Z0 (moves to X0 Y0 Z0) ; G28 G90 X1. Y1. Z1. (moves to X1. Y1. Z1.) ; G28 G91 X0 Y0 Z0 (moves directly to machine zero) ; G28 G91 X-1. Y-1. Z-1 (moves incrementally -1.) ; %

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.