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Sheave Dimension Information - According to ARPM (RMA)
Standard IP-20 (2007) (A, B, C, AX, BX, CX, AA, BB, CC)
SHEAVES
Groove Dimensions:
Groove angles and dimensions for sheaves shall conform to Table I-1 and Figure I-1.
Face Width of Sheaves:
Face width of sheaves for multiple belt drives shall be in accordance with Table I-1 and
Figure I-1.
Keyways for Sheaves:
Keyways in the hubs of sheaves shall conform to the dimensions and tolerances shown in
MPTA-B1 - Bore and Keyway Tolerances for V-Belted Sheaves.
Balance:
Sheaves shall be balanced to conform to MPTA-B2C - Standard Practice for Sheave/Pulley Balancing.
Finish:
The machined surface finish of various areas of transmission sheaves shall conform with MPTA-B4 - Standard
Surface Finish for Transmission Pulleys.
These standards are available at
www.mpta.org.OTHER SHEAVE TOLERANCES
Outside Diameter:
Up through 8.0 inches outside diameter ± 0.020 inches. For each additional inch of outside
diameter, add ±0.005 inches.
Radial Runout**:
Up through 10.0 inches outside diameter 0.010 inches. For each additional inch of outside diameter,
add 0.00
05 inches.Axial Runout**:
Up through 5.0 inches outside diameter 0.005 inches. For each additional inch of outside diameter,
add 0.001 inches.
Face Width of Standard and Deep Groove Sheaves:
Face Width = S
g
(N
g
-1) + 2S
e
Where: N
g
= Number of Grooves
**
Total Indicator Reading
SHEAVES
Groove Dimensions
. Groove angles and dimensions for
sheaves shall conform to Table I-1 and Figure I-1.
Fac Width of Sheaves
. Fac width of sheaves for multiple belt
drives shall be in accordance with Table I-1 d Figure I-1.
Keyways for Sheaves
. Keyways in the hubs of sheaves shall
conform to the dimensions and tolerances shown in
MPTA - B1
-- Bore and Keyway Tolerances for V-Belted Sheaves.
Balance
. Sheaves shall be balanced
to conform withMPTA -
B2C -- Standard Practice for Sheave / Pulley Balancing.
Finish
. The machined surface finish of various areas of
transmission sheaves shall conform with
MPTA - B4 -- Standard
Surface Finish for Transmission Pulleys.
These standards are available at
www.mpta.org.
OTHER SHEAVE TOLERANCES
Outside Diameter:
Up thru 8.0 inches outside diameter ±0.020
inches. For each additional inch of outside diameter add ±0.005
inches.
Radial Runout**:
Up thru 10.0 inches outside diameter 0.010
inches. For each additional inch of outside diameter add 0.0005
inches.
Axial Runout**:
Up thru 5.0 inches outside diameter 0.005
inches. For each additional inch of outside diameter add 0.001
inches.
Face Width of Standard and Deep Groove Sheaves:
Face Width = S g (N g -1) + 2S e
Where: N g = Number of Grooves
**Total Indicator Reading
b d
All rights reserved. The contents of this publication may not be reprinted
or otherwise reproduced in any form without the express written permission of RMA.
Figure I-1 - GROOVE DIMENSIONS
RMA IP-20 (2007)
Part 1 (Inch-Pound Units)
TECHNICAL DATA
POWERING GLOBAL INDUSTRY
TECHNICAL DATA
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