Table 14. (Continued) Double V-Belt Sheave and Groove Dimensions ANSI/RMA IP-21, 1984
Table 14. Double V-Belt Sheave and Groove Dimensions ANSI/RMA IP-21, 1984 Deep Groove Dimensions c
Drive Design Factors
Minimum Recommended Outside Diameter
S g a ± 0.025
Cross Section
Outside Diameter Range
Groove Angle, α ± 0.33 °
d B ± 0.0005
h g (Min.)
R B (Min.)
2 h d
2 a p
S e
b g
+0.090 − 0.062 +0.120 − 0.065
Up through 5.96
34 38 34 38 34 36 38 34 36
0.589 0.611 0.747 0.774
− 0.009 0.4375
0.750 0.438
3.56
0.310
AA
0.560
± 0.005 0.615
Over 5.96
− 0.008
( 7 ∕
16 )
Up through 7.71
+0.007 0.5625
BB
0.710
0.875 0.562
6.11
0.360
± 0.006 0.730
Over 7.71
+0.008
16 )
( 9 ∕
Up through 9.00 Over 9.00 up to and including 13.01 Up through 14.42 Over 14.42 up to and including 18.43 Over 13.01
1.066 1.085 1.105
− 0.035 − 0.032 − 0.031
0.7812 ( 25 ∕ 32 )
CC
1.250 0.812 +0.160 − 0.070
} ± 0.007 1.055
1.010
10.01
0.610
1.513 1.541 1.569
− 0.010 − 0.009 − 0.008
1.1250 (1 1 ∕ 8 )
1.750 1.062 +0.220 − 0.080
DD
14.43
0.830
} ± 0.008 1.435
1.430
Over 18.43 38 a Summation of the deviations from S
g for all grooves in any one sheave shall not exceed ±0.050 in. The variation 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 0.005 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 be obtained easily by mea- suring the distance across two measuring balls or rods placed diametrically opposite each other in a groove. Comparing this “diameter over balls or rods” measure - ment between grooves will give the variation in pitch diameter. b The a p values shown for the A/B combination sheaves are the geometrically derived values. These values may be different from those shown in manufacturer’s catalogs. c Deep groove sheaves are intended for drives with belt offset such as quarter-turn or vertical shaft drives. Other Sheave Tolerances Outside Diameter Radial Runout a Axial Runout a Up through 4.0 in. outside diameter ± 0.020 in. For each additional inch of outside diameter add ± 0.005 in. Up through 10.0 in. outside diameter ± 0.010 in. For each additional inch of outside diameter add 0.0005 in. Up through 5.0 in. outside diameter 0.005 in. For each additional inch of outside diameter add 0.001 in.
a Total indicator reading. All dimensions in inches.
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