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Table 2 Groove Dimensions

Standard Groove Dimensions (in.)

Design Factors

Cross

Section

Standard Groove

Outside Diameter

Groove

Angle

±

0.25

Degrees

b g

±

0.005

b

e

Ref.

b

e

h

g Min.

R

B

Min.

d

b

±

0.0005

s

g

±

0.015

s

e

Minimum

Recommended

Outside Diameter 2a 2he

3V,

3VX

Up through 3.71

Over 3.71 to and

including 6.22

Over 6.22 to and

including 1222

Over 12.22

36

38

40

42

0.421

0.425

0.429

0.434

0.350 0.449

0.073

0.076

0.079

0.080

0.3438 0.500

0.375

+0.094

-0.031

3V: 2.87

3VX: 2.42

0 0.218

5V,

5VX

Up through 10.31

Over 10.31 to and

including 16.32

Over 16.32

38

40

42

0.710

0.716

0.723

0.600 0.750

0.172

0.176

0.178

0.5938 0.812

0.562

+0.125

-0.047

5V: 7.42

5VX: 4.72

0 0.320

8V

Up through 16.51

Over 16.51 to and

including 22.92

Over 22.92

38

40

42

01.180

1.191

1.201

1.000 1.262

0.317

0.321

0.326

1.000 1.312

0.844

+0.250

-0.062

8V: 13.02

0 0.524

Summation of the deviations from “S g ” for all grooves in any one sheave shall

not exceed

±

0.031 in. The variations in pitch diameter between the grooves in

any one sheave must be within the following limits:

Up through 19.9 in. outside diameter and up through 6 grooves – 0.010 in.

(add 0.0005 in. for each additional groove).

20.0 in. and over on outside diameter and up through 10 grooves – 0.015 in.

(add 0.0005 in. 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 in.

Outside diameter:

±

0.020 in.

For each additional inch of outside diameter, add...

±

0.005 in.

Radial Runout*

Up through 10.0 in.

Outside diameter:

±

0.010 in.

For each additional inch of outside diameter, add...

±

0.0005 in.

Axial Runout*

Up through 5.0 in.

Outside diameter:

±

0.005 in.

For each additional inch of outside diameter, add...

±

0.001 in.

*Total Indicator Reading

6

V-Belts

Installation Guide