This procedure will show how to replace a drawbar in a DS-30Y (Reboot only) Sub-Spindle. 

Machine Compatibility:

• DS-30Y built from 02/11/22 to present

This procedure applies the following service kit:

• 93-3898 DRAWBAR UPGRADE KIT SEC SPNDL DS30Y 2023

 Note: This service kit will provide an upgraded drawbar that will increase the Sub-spindle bore to 1.8" (45.72 mm) to a depth of 7.2" (182.88 mm)

 Note: This procedure has the front panel removed for illustrative purposes.

If equipped, remove the Sub-Spindle parts ejector [1] from the drawbar. See the Lathe - Sub-Spindle Part Ejector procedure. 

Remove the Sub-Spindle chuck [2] and chuck thread adapter [3]. It is reccomended to attempt to remove the chuck adapter using a strap wrench before resorting to other methods that might damage the threads.

Important : Sub-spindle brake may be actuated to stop the spindle from rotating. C-axis brake can be found in Current Commands > Devices > Mechanisms > Sub-spindle Brake.

[Optional] Remove both the chuck adapter and drawbar together.

Important : Chuck adapter and drawbar are thread locked together so there is a possibility of removing them both at once. If they are removed together, refer to step 7 to install new drawbar and chuck adapter then skip to vibration testing in step 10.

Jog the turret [1] as close to the main spindle as possible and the Sub-Spindle [2] as far from the main spindle as possible.

Press [EMERGENCY STOP] then [POWER OFF].

Set the main circuit breaker to the OFF position.

Lock the main circuit breaker. Use an approved lock with an approved safety tag.

Move the conveyor [1] enough to gain access to the right enclosure panel [2].

Remove the right enclosure panel [2].

Note : The right side access panel [2] is shown in the image. Other enclosure panels may need to be removed for easier access.

Remove Sub-Spindle covers [4] and [2] to gain access to the hydraulic union.

Note : Access is very limited which might require the cover to be removed in sections to access the hydraulic union.

Remove the hydraulic union [1] from the adapter [2]. The drawbar [3] is attached to the hydraulic union. 

Remove [1] the drawbar from the hydraulic union by unscrewing it. 

Note : It is reccomended to use an open ended wrench on the machined flats of the drawbar to unscrew it.

Prep the new draw tube by wire brushing both sides of the thread then wiping it with alcohol and clean cloth.

Apply rust inhibitor on outer drawtube surface to prevent future corrosion

Apply threadlocker all the way around the first 2 threads of the drawbar threads then install [2] into hydraulic union by hand.

Caution : THREADS ARE SHARP! Use caution when threading in drawtube by hand.

Install the hydraulic union [1] with drawbar [3] into the back of the Sub-Spindle and attach it to the adapter [2]. Torque bolt per HAAS TORQUE CHART in a star pattern. C-axis brake may be used to stop spindle rotation.

Important : Make sure that the hydraulic union runout does not exceed 0.0005" TIR.

[POWER ON] the machine

Install the chuck adapter [1] by using the foot pedal in MDI mode to extend the sub-spindle draw bar the pressing [E-STOP] and applying thread lock all the way around the first 2 threads of the chuck adapter. Thread the chuck adapter onto the sub-spindle draw tube until the threads bottom out by hand. Apply CHUCK EEZ grease or any similar chuck grease to the outer threads of the chuck adapter before installing the chuck.

If equipped, install the Sub-Spindle parts ejector [1]. See the Lathe - Sub-Spindle Part Ejector procedure. 

Note : Balancing set screws are placed on the sub-spindle brake assembly [3] so its best to leave it uncovered while balancing. Make sure that the spindle is at the home position and that the access panel is closed for safety purposes.

Important : Prior to balancing the spindle secure the hydraulic and brake lines away from any moving components.

Remove the chuck jaws [1] then warm up the spindle at 25% max speed for a minimum of 10 minutes.

Place vibration sensor on highlighted area [2] then proceed to run vibration test. Refer to Vibration Analysis - Ethernet Interface or Vibration Analysis - RS-232 Interface depending on type of vibration analyzer used for vibration test procedure.

Important : Minimize time of spindle running at max speed prior to fully balancing. 

Torque balancing bolts [3] to 15 ft-Lbs after the spindle is balanced

Note : Displacement values should not exceed 0.08 mil 

Install Sub-Spindle covers  [4] and [2] using hardware [3] and [1]. 

Important : Make sure no cables get pinched or damaged during this process.

Install the right enclosure panel [1] along with any other panels that were removed. 

Move the conveyor [2] back into position. 

Install the chuck adapter [3] and chuck [2].

If equipped, install the Sub-Spindle parts ejector [1]. See the Lathe - Sub-Spindle Part Ejector procedure.