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3.35 Check / Adjusting Ballscrew Endplay
* It is important to read and understand the procedure 3.34 Working with Waycovers, before executing this procedure.
• Tools Required: 0.0001” resolution dial indicator, remote handwheel (manual pulse generator), metric allen
key set, spanner wrench.
• Check Endplay: You will need to access the pulley end of the ballscrew for the axis being worked on. To do
this, remove the left side waycover and the belt cover for the X-axis. Remove the front waycover and belt
cover for the Y-axis. The top end of the z-axis ballscrew is accessible by just moving the head down. Place a
dial indicator needle on the end of the ballscrew. Load and zero the indicator appropriately. Using the remote
handwheel set to x100 for the appropriate axis, change axis direction back and forth and observe any axial
motion shown on the indicator. Endplay should be no more than .0001”. This can also be accomplished by
jogging each axis using the manual panel buttons or manually by using an allen wrench on the end of the
ballscrew.
• Adjusting Endplay: If ballscrew endplay is greater than 0.0001”, it must be adjusted. To do so, loosen the 3
set screws on the ballscrew spanner nut adjacent to the motor coupling. Using a spanner wrench, tighten the
nut. The ballscrew will have to be held stationary with an allen key on the opposite end. Tighten the set
screws and recheck the endplay. Repeat the tightening procedure if necessary. Once the ballscrew endplay
is .0001” or less, re-install any sheet metal or motor covers and re-install the waycover(s) as applicable.
3.36 Check Axis Motor Belts
• The axis motors are connected to the ballscrews via pulley driven belts. Belts should be checked for
excessive wear and proper tension at least every 6 months.
• To access the belts, remove left side belt cover for the X-axis and the front belt cover for the Y-axis.
• The Z-axis belt is located on the top of the column
• Once you have gained access to the belts, inspect them for any visible signs or wear or damage. Once the
belts are considered acceptable, check each belt for proper tension.
• Belt tension is adjusted by loosening the slotted motor plate and sliding the motor-plate assembly to tighten
or loosen the belt as required. Double check all hardware is properly tightened once the belt tension is
correct.
• After the inspection is complete and any adjustments made, re-install the belt covers.
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