4.4. Belt Adjustment
This section applies to stages equipped with foldback motor options. On foldback stages, the motor
torque is transferred to the ball screw via a timing belt. Belt tension is critical to stage performance
and accuracy.
Check the belt tension when you clean or lubricate the stage. Deflection in the belt should be within
±10% of 1.5 mm when applying a 5 N downward force directly between the pulleys. If the deflection
exceeds this value, you will need to adjust the belt tension.
You will also need to apply lubricant to the inside flanges of the pulleys if the flanges are dry. The
flanges should have a thin film of lubricant to reduce belt wear as the belt contacts the flanges. Use
Parker Super O-Lube (silicone-based) for standard polyurethane belts.
DANGER
:
Rotating Machinery Hazard!
Fingers and loose articles can get caught in the foldback belt or pulleys.
Belt Tension Adjustment Procedure
1. Remove power to the stage.
2. Remove the four mounting screws for the foldback cover (
).
3. Check that the pulleys are tight on their respective shafts (
).
a. Each pulley is held in position with two set screws.
b. Ensure that the set screws are tight and centered over the shaft flats.
4. Check the tension in the belt to determine if adjustment is necessary.
5. If adjustment is required, loosen (but do not remove) the mounting screws for the idler pulley
mounting bracket.
6. Remove the M4 set screw to gain access to the tapped hole above the idler pulley mounting
bracket.
7. Insert an M4 screw or threaded stud long enough to contact the idler pulley mounting bracket.
8. Use the threaded stud to drive the idler pulley mounting bracket downward and increase belt
tension.
9. Tighten the mounting screws for the idler pulley mounting bracket.
10. Measure the belt deflection again and repeat the previous steps until the belt tension adjustment
is complete.
11. Check the pulley flanges for lubrication.
12. Add small amounts of Parker Super O-Lube lubricant around the circumference of both pulley
flanges (
).
13. Replace the foldback cover and mounting screws.
14. Restore power to the stage and resume normal use.
ECO165SL Hardware Manual
4.4. Belt Adjustment
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