Related Resources: belt design

Timing Belt Pulley Tolerances per. ANSI RMA IP-24

Belt Drive Design and Engineering
Mechanical Gear Design and Engineering

Synchronous Timing Belt Pulley Tolerances per. ANSI RMA IP-24, ISO 5299 and IS 9804.

Synchronous Timing Belt Pulley Mechanical Tolerances

Mechanical Tolerances Timing Belt Pulley Table
Outside
Diameter Range
Outside
Diameter
Tolerance
Pitch to Pitch Tolerance
Adjacent
Grooves
Accumulative Over
90 Degrees
Up thru 1.000
+0.002
−0.000
±0.001
±0.003
Over 1.000 to and including 2.000
+0.003
−0.000
±0.001
±0.004
Over 2.000 to and including 4.000
+0.004
−0.000
±0.001
±0.005
Over 4.000 to and including 7.000
+0.005
−0.000
±0.001
±0.005
Over 7.000 to and including 12.000
+0.006
−0.000
±0.001
±0.006
Over 12.000 to and including 20.000
+0.007
−0.000
±0.001
±0.007
Over 20.000
+0.008
−0.000
±0.001
±0.008

 

Radial Runout1 Axial Runout2
For outside diameters 8.0 in. and under 0.005 in.
For each additional inch of outside diameter add 0.0005 in.
For outside diameters 1.0 in. and under 0.001 in.
For each additional inch of outside diameter up through 10.0 in., add 0.001 in.
For each additional inch of outside diameter over 10.0 in., add 0.0005 in.

1Flange outside diameter equals pulley outside diameter plus twice flange height
2 Total indicator reading.

Related:

Synchronous Belt Standard Pulley Diameters ANSI/RMA IP-24

References:

ANSI / RMA IP-24
ISO 5299
IS 9804.

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