Rotary Tables - Backlash Test

HRT Rotary - Backlash Test

This procedure tells you how to do a test for spindle backlash on HRT rotaries.
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.

Machine Compatibility

This backlash test applies to HRT rotaries.

Tools Required

Dial Indicator with Magnetic Base
Aluminium Pry Bar (1" x 1/2" x 18")

Step 1

Disconnect the air supply to the rotary.

Put the dial indicator on the rotary as shown in the illustration.

Use an aluminium pry bar to push down the spindle [1] at about 15 ft-lb (20 N-m), and then release. Set the indicator dial to 0.

Use an aluminum pry bar to push up the spindle [2] at about 15 ft-lb (20 N-m), and then release.

If the indicator shows more than 0.0005" (0.01 mm), the adjustment of the spindle backlash is necessary.

For this adjustment you must send the rotary to a certified rotary repair facility.

For instructions on where to find a rotary repair facility and how to send your rotary unit, go to www.haascnc.com.

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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