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pulley measurements

RobinRobin Member Posts: 1,228 ✭✭✭✭✭
edited May 2009 in General Discussion
Hello folks,
I am restoring an old Craftsman jointer. I picked up a 1/2 hp electric motor. A reprint of the old manual calls for a 5" pulley for a 1/2" V belt. How are these pulleys measured? Is it the diameter, circumference or something else

Edit: Thanks for the information, so a 5" pulley would have a 4 1/2" OD diameter if the belt is 1/2". The guy at the hardware store doesn't know how to measure pulleys.
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Comments

  • dheffleydheffley Member Posts: 25,000 ✭
    edited November -1
    The outside diameter and the width of the vee at the widest point.
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  • dheffleydheffley Member Posts: 25,000 ✭
    edited November -1
    No, the pulley diameter is the largest diameter. In otherwords, if you wanted to know the diameter of a pulley for a 1/2" belt, you would lay the belt in the pulley and measure the diameter over the top of the belt.

    The velbet is measured at the widest width, not the thickness. Most 1/2" belts are 1/2" wide at the widest point, and about 5/16" at the thinest point and about 5/16 wall thichness.
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  • AlpineAlpine Member Posts: 15,093 ✭✭✭✭
    edited November -1
    Here is everything, and more, that you could want to know about pulley, sheaves, and belts:

    http://www.gizmology.net/pulleysbelts.htm
    ?The problem with socialism is that you eventually run out of other people's money.?
    Margaret Thatcher

    "There are three kinds of lies: lies, damned lies and statistics."
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