Table 33. Variable-Speed Sheave and Groove Dimensions
Standard Groove Dimensions
Variable
Companion
Drive Design Factors
a Closed +0.000 − 0.030
α Groove Angle ± 0.33 (deg)
Min. Recomm. Pitch Diameter
b go Open Max 1.63 2.23 2.71 2.17 3.39 3.75 2.81 3.67 5.13 4.55 5.03 5.51
b g
α Groove Angle ± 0.67 (deg)
2 av Max
Cross Section 1422V 1922V 2322V 1926V 2926V 3226V 2530V 3230V 4430V 4036V 4436V 4836V
S g ± 0.03 1.82 2.42 2.89
b g ± 0.010 0.875 1.188 1.438 1.188 1.812 2.000 1.562
h g Min
S g ± 0.03 1.82 2.42 2.89
CL Min
h gv Min 2.33 3.14 3.78 2.65 4.00 4.41 3.01 3.83 5.23 3.95 4.33 4.72
2 a
22 22 22 26 26 26 30 30 30 36 36 36
0.875 1.188 1.438 1.188 1.812 2.000 1.562 2.000 2.750 2.500 2.750 3.000
22 22 22 26 26 26 30 30 30 36 36 36
0.500 0.562 0.625 0.625 0.750 0.781 0.844 0.875 0.938 0.938 0.969 1.000
2.0 3.0 3.5 3.0 3.5 4.0 4.0 4.5 5.0 4.5 5.0 6.0
0.20 3.88 0.08 0.22 5.36 0.08 0.25 6.52 0.08 0.25 4.26 0.08 0.30 6.84 0.08 0.30 7.60 0.08 0.30 4.64 0.10 0.35 6.22 0.10 0.40 8.88 0.10 0.40 6.32 0.10 0.40 7.02 0.10 0.45 7.74 0.10
2.36 3.58 3.96 2.98 3.85 5.38 4.80 5.30 5.76
2.36 3.58 3.96 2.98 3.85 5.38 4.80 5.30 5.76
2.000 2.750 2.500 2.750 3.000
a The effective width ( b
e ), a reference dimension, is the same as the ideal top width of closed variable-speed sheave ( b g ) and the ideal top width of the companion
sheave ( b g ).
Other Sheave Tolerances
Radial Runout a
Axial Runout a
Outside Diameter
Up through 4.0 in. outside diameter
0.010 in. Up through 5.0 in. outside diameter
0.005 in.
± 0.020 in. Up through 10.0 in. outside diameter
For each additional inch of outside diameter add 0.0005 in.
For each additional inch of outside diameter add 0.001 in.
For each additional inch of outside diameter add ± 0.005 in.
a Total indicator reading.
Surface Finish
Max Surface Roughness Height, R a (AA) ( μ in.)
Max Surface Roughness Height, R a (AA) ( μ in.)
Machined Surface Area
Machined Surface Area
V-Sheave groove sidewalls Rim edges and ID, hub ends and OD
125 500
Straight bores with 0.002 in. or less total tolerance Taper and straight bores with total tolerance over 0.002 in.
125 250
All dimensions in inches, except where noted.
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