Machinery's Handbook, 31st Edition
V-Ribbed Belts 2593 Table 26. V-Ribbed Belt Sheave and Groove Dimensions ANSI/RMA IP-26, 1977
α
a
d B
r t
h g
r b
S g
S e
Face width = S g ( N g – 1) + 2 S e , where N g is number of grooves
Minimum Recommended Outside Diameter
α Groove Angle ± 0.25 (deg)
r t +0.005, − 0.000 2 a
Cross Section
d B ± 0.0005
h g (min)
a
S g
S e
r b
0.013 +0.000 − 0.005 0.015 +0.000 − 0.005 0.020 +0.000 − 0.005 0.015 +0.000 − 0.005 0.030 +0.000 − 0.010
0.080 +0.020 − 0.010 0.125 +0.030 − 0.015 0.125 +0.050 − 0.000 0.375 +0.075 − 0.030 0.500 +0.100 − 0.040
0.063 ± 0.001 0.005 0.020
H
0.50
40
0.041 0.0469
0.092 ± 0.001 0.008 0.030
J
0.80
40
0.071 0.0625
0.140 ± 0.002 0.010 0.038
K
1.50
40
0.122 0.1093
0.185 ± 0.002 0.015 0.058
L
3.00
40
0.183 0.1406
0.370 ± 0.003 0.030 0.116
M
7.00
40
0.377 0.2812
a Summation of the deviations from S
g for all grooves in any one sheave shall not exceed ±0.010 in. Other Sheave Tolerances a
Radial Runout b Outside Diameter:
Axial Runout b
Outside Diameter Outside Diameter:
0.001 in. per inch of outside diameter
Up through 2.9 in. Over 2.9 in. to and including 8.0 in.
Up through 2.9 in. Over 2.9 in. to and including 10.0 in.
0.005 in. 0.010 in.
± 0.010 in. ± 0.020 in.
For each additional inch of outside diameter over 8.0 in., add ± 0.0025 in.
For each additional inch of outside diameter over 10.0 in., add 0.0005 in.
a Variations in pitch diameter between the grooves in any one sheave must be within the fol- lowing limits: Up through 2.9 in. outside diameter and up through 6 grooves, 0.002 in. (add 0.001 in. for each additional groove); over 2.9 in. to and including 19.9 in. and up through 10 grooves, 0.005 in. (add 0.0002 in. for each additional groove); over 19.9 in. and up through 10 grooves, 0.010 in. (add 0.0005 in. for each additional groove). This variation can 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. b Total indicator reading. All dimensions in inches
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