Tolerances for Normal Pulley & Groove Section Dimensions
Conventional Sheave Tolerances
| Outside Diameter | | Under 12.00" | ±.020" | | 12.00" thru 23.99" | ±.040" | | 24.00" thru 57.99" | ±.060" | | 58.00" thru 71.99" | ±.120" | | Over 72.00" | ±.250" | | Outside Diameter Eccentricity | | Under 10.00"P.D. | .010" | | 10.01 "thru 60.00" | .010" plus .0005" | | P.D. | per inch of P.D. | | Side Wobble And Runout | | 20.00" P.D.& Under 20.00" thru 60.00" P.D. |
not to exceed
.001" per inch of P.D.
Add.0005" for each
add 1 inch of P.D.
up to 60.00" |
|  FACE WIDTH OF AND STANDARD SHEAVE
FACE WIDTH =S(N-1)+2E
WHERE:
N=NUMBER OF GROOVES
STANDARD SHEARS
|
Standard Shears
| BELT | MINIMUM
RECOMMENDED
OUTSIDE DIAM. | OUTSIDE
EFFECTIVE
DIAMETER | GROOVE
ANGLE | GROOVE DIMENSIONS |
| W | D | X | S | E |
| 3V | 2.65 | UNDER 3.5
3.5-6
6.01 - 12
OVER 12 | 36°
38°
40°
42° | 0.350 | 0.350 | 0.025 | 0.407 | 0.344 |
| 5V | 7.10 | UNDER 10
10-16
OVER 16 | 38°
40°
42° | 0.600 | 0.600 | 0.050 | 0.688 | 0.500 |
| 8V | 12.50 | UNDER 16
16-22.4
OVER 22.4 | 38°
40°
42° | 1 | 1 | 0.100 | 1.125 | 0.750 |
Standard Shears
| BELT | MINIMUM
RECOMMENDED
PITCH DIAM. | P.D.
RANGE | GROOVE
ANGLE | GROOVE DIMENSIONS |
| W | D | X | S | E |
| A | 3.0 | 2.6-5.4
OVER 5.4 | 34°
38° | 0.494
0.504 | 0.490 | 0.125 | 0.625 | 0.375 |
| B | 7.10 | 4.6-7.0
OVER 7.0 | 34°
38° | 0.637
0.650 | 0.580 | 0.175 | 0.750 | 0.500 |
| A-B | A 3.0
B 5.4 | 3.4-6.8
OVER 6.8 | 34°
38° | 0.612
0.625 | 0.625 | 0.175 | 0.750 | 0.500 |
| C | 9.0 | 7.0-7.99
8.0-12.0
OVER 12.0 | 34°
36°
38° | 0.879
0.887
0.895 | 0.780 | 0.200 | 1 | 0.688 |
