MAINTENANCE MANUAL
185
STE 85357
Fig. 4.49 Mounting ball screw spline nut (THL800, THL900, THL1000)
10)
Mount the axis 3 motor assembly, then adjust the belt tension. (See “Para. 4.5.3,
Replacing Axis 3 Timing Belt.
”)
11) Arrange the connectors and cables as originally set. (See the pictures you took
beforehand.)
12) Perform home setting for Axes 3 and 4.
When performing home setting for Axis 4, align the stopper split line with the
mating mark on the ball spline nut.
After home setting, remove the mating mark from the old ball spline nut, and
attach it to the new one.
13) Carry out a test operation of Axes 3 and 4 and make sure that each part
operates properly.
14) Mount the arm 2 cover. Now replacement of the ball screw spline unit
completes.
40
Arm 2
Axis 3 timing belt
Ball screw nut
Stopper
Marking on ball spline
nut (number)
Axis 3 bracket
Spline groove
Marking shaft
(number)
Do not pull out.
Ball screw spline shaft
Hexagon socket head bolts
M4 x 12 x 6 pcs.
(Apply medium strength Loctite.)
Stopper split line
Ball screw
groove
The bolt head
must be on the
right side.
Align each stopper split line with the
spline groove on the left of the
bottommost ball screw groove.