
B–65152E/03
4. NOTES ON INSTALLATION
BCATLTLON EOT TFC α
35
CAUTION
5 The tension of the belt is reduced as a result of abrasion during the initial several hours of
operation. To transfer torque normally after this reduction in tension, the initial tension before
operation should be set to a value 1.3 times the actually required tension T.
Recommended belts: Liveace manufactured by BANDO.
Livestar manufactured by MITSUBOSHI.
6 Use an appropriate tension gage to tension the belt.
Examples Sonic type: U–305 series manufactured by UNITTA.
Mechanical type: BT–33 series manufactured by Borroughs of the United States
A mechanical type tension gage may give a false reading depending on the belt’s number of
peaks and length. To overcome this problem, hang an object of a known weight on the belt, read
the tension value, then adjust the tension gage.
7 Reduce the deviation between the positions of the motor and machine pulleys in the shaft
direction as much as possible and ensure that the center lines of the shafts are as parallel as
possible.
Tension of
the belt
(kgf)
T
T1.3
0 Around 1 to 3 hours Operation time (h)
Tension kgf
T3
T2
T1
M1 M2 M3
Tension gage
Adjustment belt
(one unit)
Read the value
Tension: T = W/2 kgf
Tension gage scale
Adjustment weight (W kgf)
Radial load applied to the motor shaft (kgf) = tension (T kgf) x 2 x number of belts
Spindle pulley Spindle pulley
Spindle
Parallelism
Pulley positions
Spindle motor
Motor pulley Motor pulley