Installation
−8−
Maximum rotational torque (moment)
Keep the rotational torque received by the rack to or below the permissible value, as applicable, specified in
the table below.
Linear head model
Permissible rotational torque (moment) on rack
2LS
type
0.3 N·m (2.6 lb-in) or less
4LS
type
0.5 N·m (4.4 lb-in) or less
Note
If the rack receives excessive rotational torque, the rack bushing will wear quickly.
Gap between rack and rack bushing
There is a slight gap between the rack and rack bushing of the linear head. Initial values of the backlash
generated from the gap would be as follows.
A
B
D
C
Backlash generated from gap
•
A, B directions: About 2 mm
•
C direction: About 0.5 mm
•
D direction: About 0.5°
*
The above gap dimensions in directions A and B are measured at
500 mm (19.69 in.) from the end face of the case on the linear head.
As the rack is operated repeatedly, the rack bushing will wear, and also this backlash will increase.
If you have concerns about the backlash, install a guide and others.
3.4 Assembling the motor
The assembly method varies between the
2LS
type and
4LS
type.
Note
•
When assembling the motor, do not damage the motor shaft and gear. Noise will occur.
•
In the case of a motor of the terminal box type, assemble the motor in a manner
preventing the terminal box from contacting the limit switch.
2LS
Type
1.
Affix the gear case and rack case using an adhesive
tape, etc., so that the two will not separate from each
other.
2.
Remove the screws and washers assembling the
gear case and rack case.
3.
Assemble the motor, and affix the motor, gear
case and rack case using the screws and washers
removed in the preceding step.
Tightening torque: 1.8 N·m (250 oz-in)
4LS
Type
Affix the motor to the gear case using the supplied screws.
Tightening torque: 3.8 N·m (530 oz-in)
