Machine Rotary Zero Point (MRZP)

Next Generation Control Mill Operator's Manual

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The Machine Rotary Zero Point (MRZP) Offsets are control settings that define the centers of rotation for the rotary table relative to the home positions of the linear axes. The control uses the MRZP for Tool Center Point Control (TCPC) and Dynamic Work Offsets (DWO) for 4th- and 5th-axis machining. MRZP uses Settings 255, 256, and 257 to define the zero point.

255 – Machine Rotary Zero Point X Offset

256 – Machine Rotary Zero Point Y Offset

257 – Machine Rotary Zero Point Z Offset

The value stored in each of these settings is the distance from the home position of a linear axis to the center of rotation of a rotary axis. The units are in current machine units (as defined by Setting 9).

note: In machines with built-in 4th and 5th axes, such as the UMC-750, the initial MRZP offsets are set at the factory. You do not have to set initial values for these machines.

You do the MRZP adjustment procedures when:

  • You install a new rotary unit in a mill, and you want to use TCPC/DWO.
  • The machine has been crashed.
  • The machine’s level has changed.
  • You want to make sure that the MRZP settings are correct.

MRZP adjustment consists of (2) stages: rough and finish. The rough stage establishes MRZP values that the control uses for the finish stage. Generally, you do the rough stage only at new installations, or when you are not sure if the current MRZP settings are close enough to correct for the finish set procedure.

Both the rough and finish MRZP procedures use the work probe to generate values in macro variables, which you then transfer to the correct settings. You must change the values manually because the setting values cannot be set via macro. This protects them from accidental change in the middle of a program.


These instructions assume that the probe system is installed and correctly calibrated.

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.