1. #1
    m_c's Avatar
    Lives in East Lothian, United Kingdom. Last Activity: 17 Hours Ago Has been a member for 9-10 years. Has a total post count of 1,831. Received thanks 192 times, giving thanks to others 5 times.
    What's currently available for calculating pulley spacing/belt sizing?

    Or, if somebody happens to have some already installed, and willing to run a few calcs, I currently have a 10:20 L(3/8" pitch) setup linked with a 150L (40tooth 15"/381mm) belt.
    I'm wanting to change to a 16:20 set-up, and need to know the difference in centre distance between the pulleys using the existing belt, and the next commonly availble size up which would appear to be a 187L (50tooth) belt.

    Thanks!

  2. #2
    Try my spreadsheet:

    http://www.mycncuk.com/forums/machin...t-lengths.html

    Changethe 'Belt pitch' to 9.525mm and it'll work.
    Old router build log here. New router build log here. Lathe build log here.
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  3. #3
    m_c's Avatar
    Lives in East Lothian, United Kingdom. Last Activity: 17 Hours Ago Has been a member for 9-10 years. Has a total post count of 1,831. Received thanks 192 times, giving thanks to others 5 times.
    Thanks for that.

    15mm nearer for the same belt, or 30+mm for the longer belt. I'll need to do some measuring in the morning.

  4. #4
    Edit: Ooops ! wrong thread, please ignore.
    Last edited by EddyCurrent; 12-04-2014 at 01:31 PM.
    Spelling mistakes are not intentional, I only seem to see them some time after I've posted

  5. #5
    Ger21's Avatar
    Lives in Detroit, United States. Last Activity: 21 Hours Ago Has been a member for 5-6 years. Has a total post count of 508. Received thanks 68 times, giving thanks to others 0 times. Referred 1 members to the community.

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