Mechanical Adjustments; Y-Belt Tension Adjustment - GRAPHTEC FC8600-60 Service Manual

7.2

Mechanical Adjustments

7.2.1

Y-Belt Tension Adjustment

How to adjust the Y-belt tension
Belt tension adjustment is required to set proper tension of the belt to maintain machine performance, reduce
overshoot, and correct any out-of-phase condition in the Y-axis.
(1) Detach the right side cover (see Subsection 6.1.1).
(2) With the Y-slider on the Y-rail and the belt attached, adjust the Y-tension pulley adjustment screws that
hold the Y-tension pulley onto the left side plate in order to tighten the Y-slider belt. Do not over-tighten.
Move the Y-slider from left to right several times to verify that the tension is set correctly.
(3) Move the Y-slider all the way to the right and pull the belt 20 mm towards the center using a force
gauge. Adjust the Y-tension pulley adjustment screws evenly until the tension reads as follows:
Specification of the Belt Tension
Model Force gauge reading specification
FC8600-60
FC8600-75
FC8600-100
FC8600-130
FC8600-160
Y belt
(4) Verify that the Y-slider belt is centered and does not move up and down when the Y-slider is moved from
left to right several times. The Y-slider belt should not move up and down more than 1.5 mm.
Y-tension pulley
adjustment screws
(5) If the Y-slider belt continues to move up and down or exhibits less clearance, re-adjust the Y-tension
pulley adjustment screws and check the belt tension again.
(6) Reattach the right side cover.
FC8600-UM-251-9370
700 g+50
700 g+50
700 g+50
700 g+50
700 g+50
700 g + 50g
Y idler pulley
7-2
7
Y idler pulley
20 mm
The Y-slider belt should
not move up and down
more than 1.5 mm.
ADJUSTMENT