Table 9. Classical V-Belt Sheave and Groove Dimensions ANSI/RMA IP-20, 1988 Deep Groove Dimensions f Table 9. (Continued) Classical V-Belt Sheave and Groove Dimensions ANSI/RMA IP-20, 1988
Design Factors
Datum a Dia. Range Through 7.0 Through 7.99 Over 7.99 to and incl. 12.0 Over 12.0 Through 12.99 Over 7.0 Over 12.99 to and incl. 17.0 Over 17.0
S g b ± 0.025
Cross- Section B, BX
2 h d Ref
α Groove Angle ± 0.33 °
Min Rec. Datum Diameter 2 a p
R B Min
d B ± 0.0005
b g Ref
h g Min
b g
S e
34 38 34 36 38 34 36 38
0.747 0.774 1.066
0.007 0.5625
+ 0.120 − 0.065
B 5.4
0.530
0.875 0.562
0.36
± 0.006 0.730 0.710
BX 4.0
0.008
( 9 ∕ 16 )
− 0.035 − 0.032 − 0.031 − 0.010 − 0.009
0.7812 ( 25 ∕ 32 )
C 9.0 CX 6.8
C, CX
0.757
1.055 1.010
1.250 0.812 + 0.160 − 0.070
0.61
1.085 ± 0.007
1.105 1.513
1.1250 (1 1 ∕ 8 )
1.750 1.062 +0.220 − 0.080
13.0
0.83
D
1.076
1.514 ± 0.008
1.435 1.430
1.569 − 0.008 a The A/AX, B/BX combination groove should be used when deep grooves are required for A or AX belts. b Summation of the deviations from S
g for all grooves in any one sheave should not exceed ±0.050 in. The variation in datum diameter between the grooves in any one sheave must be within the following limits: Through 19.9 in. outside diameter and through 6 grooves: 0.010 in. (add 0.0005 in. for each additional groove). 20.0 in. and over on outside diameter and through 10 grooves: 0.015 in. (add 0.0005 in. for each additional groove). This variation can be obtained by measuring the dis- tance across two measuring balls or rods placed diametrically opposite each other in a groove. Comparing this “diameter over balls or rods” measurement between grooves will give the variation in datum diameter. c Diameters shown for combination grooves are outside diameters. A specific datum diameter does not exist for either A or B belts in combination grooves. d The b d value shown for combination grooves is the “constant width” point, but does not represent a datum width for either A or B belts (2 h d = 0.340 ref). e 2 h d values for combination grooves are calculated based on b d for A and B grooves. f Deep groove sheaves are intended for drives with belt offset such as quarter-turn or vertical shaft drives. Joined belts will not operate in deep groove sheaves. Also, A and AX joined belts will not operate in A/AX and B/BX combination grooves. Other Sheave Tolerances Outside Diameter Radial Runout a Axial Runout a
Through 10.0 in. outside diameter 0.010 in. For each additional inch of outside diameter add 0.0005 in.
Through 5.0 in. outside diameter 0.005 in. For each additional inch of outside diameter add 0.001 in.
Through 8.0 in. outside diameter ± 0.020 in. For each additional inch of outside diameter add ± 0.005 in.
a Total indicator readings. A, AX & B, BX Combin. All dimensions in inches.
Made with FlippingBook - Share PDF online