MAINTENANCE MANUAL
50
STE 85357
4)
Disconnect the axis 3 timing belt.
Fig. 2.30 Replacing axis 3 timing belt (THL300, THL400)
5)
Mount the new timing belt.
6)
Hang the timing belt to the axis 3 motor assembly which was previously
removed in 3), and temporarily secure it to Arm 2 with four (4) flange head bolts
(M4 x 8, application of Loctite not necessary). Move the ball screw spline unit
up and down to make it fit in. Apply tension using two (2) axis 3 tension
adjustment bolts (M3 x 12, application of Loctite not necessary).
While pulling the axis 3 motor plate with the axis 3 tension adjustment bolts,
measure the tension with a tension meter. Tighten the flange head bolt at the
location where the tension reaches a value slightly smaller than 48 N (because
the tension gets larger by retightening of the flange head bolt). Adjust so that
the tensile value becomes between 48 and 64 N when the flange head bolt is
retightened. If the bolt is not tightened any further, the bolt will come out while
the robot is in operation. Next, fasten with the hexagon nuts.
The values to be used for the tension meter are as shown in the table below.
Axis 3 timing belt