Spindle - 40-Taper - Belt Drive - Drawbar Assembly - Replacement

Applies to machines built from: 
December, 1989
AD0278 Rev B

Spindle - 40-Taper - Drawbar Assembly - Replacement

This procedure tells you how to replace the drawbar assembly.

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.

Prerequisites

This procedure is applicable to (5) different kits. You use only (1) of the kits from the "Parts Included" section.

Parts Included

KIT
93-30-3410C
QTY: 1
DRAWBAR, 40T BELT DRIVE, 900 - 1300 LB
KIT
93-30-2406A
QTY: 1
DRAWBAR, 40T BELT DRIVE (15K), 900 - 1300LB
KIT
93-30-3410D
QTY: 1
DRAWBAR, 40T BELT DRIVE, 1000 - 1200 LB
KIT
93-30-3415F
QTY: 1
DRAWBAR, 40T BELT DRIVE, 1000 - 1200 LB
KIT
93-30-3415H
QTY: 1
DRAWBAR, 40T TSC BELT DRIVE, 1750 - 2100 LB

Tools Required

Gearbox machines: hoist that has a 200 lb (91 kg) capacity

Step 1

Push EMERGENCY STOP when you do maintenance on the machine.
Put a toolholder without a tool in the spindle. Close the primary air valve to the machine. Remove the tool release piston (TRP) assembly [1]. Remove the retaining ring [2] from the spindle shaft. Install the TRP assembly [1]. Open the primary air valve to the machine. Remove the toolholder from the spindle. Close the primary air valve to the machine. Remove the TRP assembly [1].

If the machine has a gearbox: Remove the (6) screws [4] from the gearbox base. Use the hoist [5] to lift the gearbox and spindle motor assembly [6] until you can easily remove the drawbar [3].

Remove the used drawbar assembly [3]. Clean the bore of the spindle shaft. Make sure the balls [7] or o-rings from the used drawbar assembly [3] did not fall into the bore of the spindle shaft.

Make sure the (5) balls [7] are fully in position at the end of the replacement drawbar [3]. Lightly push the drawbar [3] to install it into the spindle shaft.

caution: Install the drawbar [3] with light force so you do not damage the o-rings. Do not use a tool to hit the drawbar into position.
Install the TRP assembly [1]. This lets you put a toolholder into the spindle. Open the primary air valve to the machine. Put a toolholder without a tool in the spindle. Close the primary air valve to the machine.Remove the TRP assembly [1]. Install the retaining ring [2] onto the spindle shaft.

If the machine has a gearbox: Install the (6) screws [4] into the gearbox base. Make sure the drive belts are moderately tight. If the belts are too tight, they make noise at high speeds. If the belts are too loose, they vibrate. If you cannot adjust the drive belt tension, speak to your local HFO. Torque the screws [4] on the gearbox base to 25 ft-lbs.

Install the TRP assembly [1]. Torque the screws to 45 ft-lbs.

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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