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BJ5-615 Chapter 5: Maintenance 41 of 85
Checking the tension force of the V-belt
1. Remove the V-belt cover.
2. Measure the distance between the roller centers.
3. Determine the belt sag force F for each belt at 16 mm sag if sag "b" is
equal to 1 m distance between roller centers. Do this by measuring the
distance between roller centers at a right angle to the V-belt.
Force required for 1m distance between
roller centres and 16mm sag
Profile section Efficiency of x in
mm
P in Newton P in lbs
SPA 100 - 132 20 - 27 4,4 - 5,9
SPA 140 - 200 27 - 35 5,9 - 7,7
SPB 160 - 224 35 - 50 7,7 - 11
SPB 236 - 315 50 -65 11 - 14,3
SPC 224 - 355 60 - 90 13,2 - 19,8
SPC 375 - 560 90 - 120 19,8 - 26,4
XPB 224 - 250 25 - 35 5,5 - 7,7
4. Compare determined value with the value in the above table. If the value
lies below the lowest tolerance limit, the V-belt must be re-tensioned. If
the value lies above the highest tolerance limit, the V-belt must be relaxed.
Re-tensioning and relaxing the V-belt
Enlarging or decreasing the centre distance “A” tensions or relaxes the V-belt.
1. Loosen the tensioning screw.
2. Shift the drive motor as required onto the sliding rails.
a: Distance between
roller centers.
b: Sag
F: Force (direction)