Gallery, Projects and General > How do I??
Making pulleys (sheaves)
wgw:
I have made V pulleys from sheet, turn half a groove on each sheet. Easier than parting tool and form tool.
philf:
Ade,
I've got a surplus of pulleys. I have 3 off 241mm OD A Section pulleys and a number of smaller A section pulleys 4, 5, 6, 7".
The big pulleys have bearings in a flanged boss which is bolted to the pulley.
When you get round to picking up the machine vice (which I just had to move to get at the pulleys) you can take your pick of the pulleys!
Cheers.
Phil.
John Stevenson:
Dumbell weights make good pulley blanks
Pete W.:
Hi there, Ade,
Rule of thumb: to get the effective diameter of the vee pulley, subtract the thickness of the vee belt from the pulley outside diameter. That's a more accurate figure to use in predicting the effective ratio of a pair of vee pulleys. This assumes the neutral level of the belt wrapping round the pulley is halfway down - in practice, I think it's a bit shallower than that.
I did write 'rule of thumb' - you can get more accurate data from the vee-belt manufacturers' literature. In the 'old days', the name to look for was Fenner (not to be confused with the famous Fenner on Cape Cod!!).
I just got off my chair and dug out 'Belt Drives in the Small Workshop' by "Duplex", published by Percival Marshall (price three & sixpence net!). That title might have been carried forward to the 'Workshop Practice Series'. The best I could find in its pages said the pitch diameter is the OD less the belt thickness as in my opening sentence.
mc:
The easy option to calculate pulleys/belts which will eliminate any guesswork, is to download Gates Design Flex software, put in the figures, select the belt type(s) you'd like to use, and it will come up with various combinations.
Download page is http://www.gates.com/catalogs-and-resources/resources/repository/engineering-business-applications/design-flex
There is a mobile version, but I've never used it, so I have no idea if it's as in depth as the download version.
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