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Balancing<br />
Steel pulleys that have been machined on all sides do not need to<br />
be balanced if the circumferential speed is below 30 m/s. Grey<br />
cast iron pulleys for medium speeds should be statically balanced<br />
as follows:<br />
Section Number of teeth Static balance [N]<br />
3M all 0.04<br />
5M all 0.08<br />
8M ≤ 130 0.08<br />
> 130 0.16<br />
14M<br />
≤ 72 0.08<br />
> 72 0.16<br />
Timing pulleys which are used for circumferential speeds in excess<br />
of 30 m/s, must be balanced dynamically to 1.8 · 10 -5 Nm.<br />
Timing pulleys<br />
Dimensions and tolerances<br />
Parallelism<br />
The teeth are to be aligned in parallel to the axis of the bore, with<br />
a variation of no more than 0.001 mm per millimetre width.<br />
Taper<br />
The taper across the pulley face may not exceed 0.001 mm per<br />
millimetre of the face width and at the same time may not exceed<br />
the permissible outside diameter tolerance indicated on page 64.<br />
65
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