Coupling With Machine - Mitsubishi Electric JR Series Instruction Manual

5. COUPLING WITH MACHINE

(1) Direct coupling (Refer to Fig. 2)
Install the motor so that the center of the motor-shaft and the center of the partner machine's shaft
are aligned.
Place a linear under the motor or machine leg if necessary, and completely adjust.
Fig. 2 Direct coupling with partner machine
[Supplement] Coupling centering procedures
(1) Put a matchmark on the outer periphery of the coupling.
(2) Secure the dial gauge on one side of the coupling.
(3) Turn the shaft by 90°, read the value on the dial gauge, and measure the
gap in the matchmark with a thickness gauge.
(4) Adjust the coupling until the value on the dial gauge and the
measurement of gap conform to Table 1.
(2) Belt drive
a. Set the motor and partner machine so that the shafts are parallel, and so that the centers of
both pulleys are at a right angle on the same line. (Refer to Fig. 3.)
Partner pulley
b. Make sure that the lower side of the belt is the tensed
side. For this, determine the rotation direction of the
partner machine, and determine the motor position.
(Refer to Fig. 3.)
c. Refer to Table 2 for the motor and partner machine
shaft-to-shaft distance.
d. Belt tensioning method
If the belt is too tense, the bearings may be damaged or the shaft may break. If the belt is too
loose, slipping may occur causing the belt to be damaged or to come off. For the flat belt, the
adequate degree is where the pulley rotates lightly when the belt is pulled with one hand.
Calculate the tension of the V-belt with the following expression.
(a) Obtain the span length t of the belt and V-pulley with the following expression or by actual
measurement.
t =
A A
Motor pulley
1.1. <1mm when C is
Belt
1000mm or less
C
2.2. <C<1/1000 when C

exceeds 1000mm
3.3. <1/3°
Fig. 3 Belt guiding method
- D – d
2
2
2 2 (mm)
C
2
Table 1 Allowable mounting dimensions of coupling
Kind of
coupling
Rigid
coupling
Flexible
coupling
C
Motor
Partner machine
- 3 -
Dimension
Dimension A
B
0.03 mm
0mm
or less
Coupling
manufacturer's 0.05 mm
recommendation or less
or less
Matchmark
Allow slackness on top
Partner machine
Tense on bottom
Allow slackness on top
Motor
Tense on bottom
Table 2 Motor and partner machine
shaft-to-shaft distances
V belt Flat belt
Adequate Two times Five to six
distance D + d
Min. Three times
D + d
distance
Dimension
C
0.03 mm
or less
0.04 mm
or less
Dial gauge
times D
D