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Mamod drive-belt tension

How tight should a Mamod drive-belt be ?

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Bob Unitt 128/01/2022 12:24:02
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202 forum posts
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I've acquired some Mamod drive-belt (the screw-together kind) for the governor on my Lady Stephanie, to replace the elastic band used currently. I have no idea of what length of belt I need, so how much tension should there be on the band once it's fitted ?

john halfpenny28/01/2022 14:41:26
232 forum posts
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Not very much, but of course depends on the torque you are trying to transmit/overcome. However it's easy to start slack and snip bit by bit off the female end before re-attaching the (tapered) male end

Former Member28/01/2022 14:49:20
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Bob Unitt 128/01/2022 16:05:26
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Thanks. The guy I bought it from said that once it was screwed together it was impossible to unscrew - is that not the case ?

Former Member28/01/2022 16:11:50
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Roger Best30/01/2022 21:11:18
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369 forum posts
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1/2" is too much to chop off. They are very sensitive to just a few mm plus minus. Just go carefully.

Obviously it varies with size of garter spring, and length required.

i am no longer surprised when I get it wrong.

Bob Unitt 131/01/2022 09:46:46
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Thanks for the info. I have at least 1/2" jockey-wheel adjustment on a length of about 5" - will it be sufficient to make it fit closely but not stretch, and use that adjustment to get the tension right ?

Former Member31/01/2022 10:28:03
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Bob Unitt 103/02/2022 22:28:20
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202 forum posts
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Thanks guys, all done now after 3 attempts - those belts don't join easily, do they ?

If anyone else is making a Lady Stephanie and intends to use the Mamod belt, the length you need is 7.375 inches.

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