Stepped Vee Pulley query

Mar 21, 2009 4 Replies
R

When you measure a stepped Vee Pulley, is it the outside diameter that defines the size, or wha?



And is the speed ratio calculated from the relative diameters - or, again, what ?



Thanks



Rob


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R

When you measure a stepped Vee Pulley, is it the outside diameter that defines the size, or wha?

And is the speed ratio calculated from the relative diameters - or, again, what ?

Thanks

Rob

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D

No, there is an "effective diameter" called the PCD or pitch circle diameter, which is always smaller than the overall diameter.

Speed ratio is calculated from the ratio of the PCDs.

Also, you should be aware that there are Vee belts (size A, B and C) and wedge belts (type Z, SPZ, SPZX), and you need to get the right type/size for your pulley.

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R

Thanks guys - I'll be able to progress from that. Rob

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