Page 5 - Goodyear2011PTMaintenanceManual

5
V-Belt
INSTALLATION GUIDE
3V
3VX
5V
5VX
8V
3V
3VX
5V
5VX
8V
Summation of the deviations from “S g ” for all grooves in any one sheave
shall not exceed ±0.031 inch. The variations in pitch diameter between
the grooves in any one sheave must be within the following limits:
Up through 19.9 inches outside diameter and up through 6 grooves –
0.010 inches (Add 0.0005 inches for each additional groove.)
20.0 inches and over on outside diameter and up through 10 grooves –
0.015 inches (add 0.0005 inches for each additional groove.)
This variation can easily 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.
Deep groove sheaves are intended for drives with belt offset such
as quarter-turn or vertical shaft drives. (See Power Transmission Belt
Technical Information Bulletin IP-3-10) They may also be necessary where
oscillations in the center distance may occur. Joined belts will not operate
in deep groove sheaves.
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.....±0.0005 inches
Axial Runout**
Up through 5.0 inches outside diameter.....±0.005 inches
For each additional inch of outside diameter add.....±0.001 inches
**Total Indicator Reading
Industry Standard Groove Dimensions for Hy-T Wedge ® Belt Drives
Face Width of Standard
and Deep Groove Sheaves
Face Width = Sg (Ng –1) + 2Se
Where: Ng =Number of Grooves
TABLE 2 GROOVE DIMENSIONS —INCHES