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Table 2 Groove Dimensions
Standard Groove Dimensions (in.)
Design Factors
Cross
Section
Standard Groove
Outside Diameter
Groove
Angle
±
0.25
Degrees
b g
±
0.005
b
e
Ref.
b
e
h
g Min.
R
B
Min.
d
b
±
0.0005
s
g
±
0.015
s
e
Minimum
Recommended
Outside Diameter 2a 2he
3V,
3VX
Up through 3.71
Over 3.71 to and
including 6.22
Over 6.22 to and
including 1222
Over 12.22
36
38
40
42
0.421
0.425
0.429
0.434
0.350 0.449
0.073
0.076
0.079
0.080
0.3438 0.500
0.375
+0.094
-0.031
3V: 2.87
3VX: 2.42
0 0.218
5V,
5VX
Up through 10.31
Over 10.31 to and
including 16.32
Over 16.32
38
40
42
0.710
0.716
0.723
0.600 0.750
0.172
0.176
0.178
0.5938 0.812
0.562
+0.125
-0.047
5V: 7.42
5VX: 4.72
0 0.320
8V
Up through 16.51
Over 16.51 to and
including 22.92
Over 22.92
38
40
42
01.180
1.191
1.201
1.000 1.262
0.317
0.321
0.326
1.000 1.312
0.844
+0.250
-0.062
8V: 13.02
0 0.524
Summation of the deviations from “S g ” for all grooves in any one sheave shall
not exceed
±
0.031 in. The variations in pitch diameter between the grooves in
any one sheave must be within the following limits:
Up through 19.9 in. outside diameter and up through 6 grooves – 0.010 in.
(add 0.0005 in. for each additional groove).
20.0 in. and over on outside diameter and up through 10 grooves – 0.015 in.
(add 0.0005 in. for each additional groove).
This variation can easily be obtained by measuring the distance across two
measuring balls or rods placed in the grooves diametrically opposite each
other. Comparing this “diameter over balls or rods” measurement between
grooves will give the variation in pitch diameter.
Deep groove sheaves are intended for drives with belt offset such as quarter-turn
or vertical shaft drives (see Power Transmission Belt Technical Information
Bulletin IP-3-10). They may also be necessary where oscillations in the center
distance may occur. Joined belts will not operate in deep groove sheaves.
Other Sheave Tolerances
Outside Diameter
Up through 8.0 in.
Outside diameter:
±
0.020 in.
For each additional inch of outside diameter, add...
±
0.005 in.
Radial Runout*
Up through 10.0 in.
Outside diameter:
±
0.010 in.
For each additional inch of outside diameter, add...
±
0.0005 in.
Axial Runout*
Up through 5.0 in.
Outside diameter:
±
0.005 in.
For each additional inch of outside diameter, add...
±
0.001 in.
*Total Indicator Reading
6
V-Belts
Installation Guide