
B-65272EN/04 SPECIFICATIONS FOR THE αi SERIES 4.NOTES ON INSTALLATION
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6 Use an appropriate tension gage to tension the belt.
Examples
Sonic type:
U-305 series manufactured by UNITTA.
Mechanical type:
BT-33-73F manufactured by KENT-MOORE 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.
Tension gage
djustment weight (W kgf)
djustment belt
(onie unit)
Read the value
Tension
kgf
Tension : T=W/2 kgf
T3
T2
T1
M3M2 M1
Tension gage scale
Radial load applied to the motor shaft (kgf) = tension (T kgf)
×
2
×
number of belts
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.
Spindle motor
Spindle
Spindle pulley
Parallelism
Pulley positions
Motor pulley
Spindle pulley
Motor pulley