Axis Servo Motor - Set Grid Offset Parameter

Axis Grid Offset - Introduction

This procedure tells you how to set the parameters for the grid offset for each axis. These parameters set the number of encoder counts necessary to move the axis from the home switch to the motor zero-channel after you use ZERO RETURN.

Do this procedure if you have one of the conditions:

  • a servo motor, a ball screw, or a proximity switch was replaced
  • you have one of these alarms:
    • AXIS ZERO RETURN MARGIN IS TOO SMALL
    • AXIS ZERO RETURN MARGIN IS TOO LARGE

 

Safety Notes
Caution: When you do maintenance or repair on CNC machines and their components, you must always follow basic safety precautions. This decreases the risk of injury and mechanical damage.

Do these steps before you do work in the machine or in the control cabinet:
  • Set the main circuit breaker to the OFF position.
  • Use an approved lock with an approved safety tag. Always follow lock-out procedures in accordance to local government rules.
  • After turning off the machine, wait at least 5 minutes before working in the control cabinet, to allow power to dissipate. Wait for the voltage indicator LED on the vector drive to go off completely.
  • Always turn off the main air supply when you work on any part of the pneumatic system.
  • Make sure to rest the spindle head on a block of wood when work is done on a vertical axis. This will prevent any unintended movement that could result in the axis falling.
  • Never alter any safety circuits on the machine.
You should not do machine repair or service procedures unless you are qualified and knowledgeable about the processes. Serious damage to the machine components can result in costly repairs. The service technicians at your Haas Factory Outlet (HFO) have the training and experience, and are certified to do these tasks safely and correctly. The repair and service work performed by your HFO is protected with a limited warranty.
danger: Some service procedures can be dangerous or life-threatening. DO NOT attempt a procedure that you do not fully understand. If you have any doubts about doing a procedure contact your Haas Factory Outlet (HFO) and schedule a service visit.

Axis Grid Offset

Step 1

Set Setting 7, Parameter Lock, to OFF.

Find the parameters for the GRID OFFSET you will change.

Axis X Y Z A B
Parameter - Grid Offset 125 126 127 128 170
Parameter - Ratio (Steps/Units) 5 19 33 47 155

For example, to set the grid offset for the X Axis, find Parameters 125 (X GRID OFFSET) and 5 (X RATIO [STEPS/UNIT]):

Set the correct GRID OFFSET parameter to 0. For example, for the X Axis, set Parameter 125 to 0.

Push ZERO RETURN. Push the letter of the correct axis, for example X. Push SINGLE.

Step 2

Push POSIT.

Do these calculations to get the grid offset for the correct axis:

• Subtract 0.118 from the DIST TO GO.

EXAMPLE: X-Axis DIST TO GO = 0.1961 [1]

0.1961 - 0.118 = 0.0781

• Multiply the result by the value of the RATIO (STEPS/UNITS) parameter.

EXAMPLE: X Ratio (Parameter 5) = 665846 [2]

0.0781 x 665846 = 52002.57

• Round the result to (5) digits. EXAMPLE: 52003.

Push EMERGENCY STOP.

Set the correct GRID OFFSET parameter to the calculated value. For this example, set Parameter 125 to 52003 [3].

Release the EMERGENCY STOP. Push RESET.

Push ZERO RETURN. Push the letter of the correct axis, for example X. Push SINGLE.

Conclusion

If you change the GRID OFFSET for the Z Axis, make sure to adjust Parameter 64, Z TOOL CHANGE OFFSET. For VMCs, refer to one of these procedures:

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.

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