MAINTENANCE MANUAL
112
STE 85357
For the mounting of the ball screw spline unit and the stoppers, see
“Para. 3.7.5,
Mounti
ng Ball Screw Spline Unit.”
4)
Temporarily set the axis 4 motor assembly which was disconnected in Step 2)
above to Arm 2 with the four (4) flange head bolts (M4 x 10 x 4 Loctite is not
necessary) after setting the axis 4 timing belt to the axis 4 motor pulley. Be
careful with the motor assembly mounting phase at this time.
Fig. 3.32 Ball screw and axis 4 motor assembly (THL500, THL600, THL700)
5)
While pulling the axis 4 motor plate with the axis 4 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 150 N (because
the tension gets larger by retightening of the flange head bolt). Adjust so that the
tensile value becomes between 150 and 180 N when the flange head bolt is
retightened. After that, gradually tighten the tension adjusting bolt, and fix it
with a nut. If the tension adjusting bolt is not tightened in this step, the tension
adjusting bolt may be disconnected during the robot operation. The values to be
used for the tension meter are as shown in the table below.
Hexagon socket
head cap screws
M4 x 16 x 4 pcs.
(Apply medium
strength Loctite.)
Flange head bolt
M4 x 10 x 4 pcs.
Axis 4 motor pulley
Fasten so that the motor
lead wire faces the direction
of the arrow.
Ball screw
spline shaft
Axis 4 motor assembly
Ball screw nut
Axis 3 timing belt
Axis 4 timing belt
Align the phases and insert.
Stopper