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Thread: Need size of belt for ShopSmith Mark 5

  1. #1
    Join Date
    Sep 2006
    Location
    Shenandoah Valley in Virginia
    Posts
    396

    Need size of belt for ShopSmith Mark 5

    My grandson has an older ShopSmith Mark5 ser 358532 and want to replace the belt...
    Intend to put a PowerTwist on it so he does not have to disassemble the unit...

    Can anyone please advise the width of the belt 3/8" or 1/2"
    and the length of it so I can order it ???

    He does not live close by, so unable to measure it in person...

    Any help very much appreciated...

    Thanks,
    Ed Aumiller

  2. #2
    I'm not sure a powerTwist will work with the variable diameter sheaves the SS uses to change speeds. In any case, I don't believe you need to disassemble the unit to replace the belt, although there is a fair amount of fiddling.

    Here are the instructions for changing the Mark V belt from the shopsmith web site: https://www.shopsmith.com/ownersite/...eplacement.pdf

    Their web site has exploded drawings and parts lists for everything. They may tell you what size belt it uses, although I didn't see that info with a quick check.

  3. #3
    Join Date
    Jan 2013
    Location
    Pittsburgh, PA
    Posts
    756
    You might also check out this guy’s store. He sells the belts you need.

    https://jacobs-repair-shop.myshopify.com/

    He also has a lot of instructional YouTube videos worth a look.

    Bill
    Too much to do...Not enough time...life is too short!

  4. #4
    Join Date
    Nov 2007
    Location
    NW Indiana
    Posts
    2,307
    Jacobs Repair Shop is great with the videos. He also does great repair work. I shipped him my Mark V head a year ago and he completely rebuilt it. I am very pleased with his work.

  5. #5
    Join Date
    Sep 2006
    Location
    Shenandoah Valley in Virginia
    Posts
    396
    Thank you for replies...

    Do not know why a PowerTwist belt would not work.. same as a regular v-belt..
    Has anyone done this ??

  6. #6
    Quote Originally Posted by Ed Aumiller View Post
    Thank you for replies...

    Do not know why a PowerTwist belt would not work.. same as a regular v-belt..
    Has anyone done this ??
    The PowerTwist belt is really NOT the same as the regular v-belt. The sheaves in the Shopsmith speed control (a Reeves drive) depends on the angled sides of the v-belt to move up and down against the angled sides of the sheaves to change speeds. PowerTwist belts are great for drives that use single pulley, but I wouldn't put them on a Reeves drive like the Shopsmith or the old Delta or Powermatic 45/90. Granted, I have not tried it, but I've owned two Shopsmiths and worked on their speed controls a bunch. I don't see how it could possibly work. And changing the belts is about a 5 - 10 minute exercise, following the instructions from Shopsmith.
    Dave

    Nothing is idiot-proof for a sufficiently ingenious idiot!

  7. #7
    Join Date
    Mar 2019
    Location
    Greeley, CO
    Posts
    53
    Quote Originally Posted by David Dockstader View Post
    ...And changing the belts is about a 5 - 10 minute exercise, following the instructions from Shopsmith.
    10 minutes would be increadibly fast for the v belt. Replacing the gilmer/poly v belt requires pulling the main arbor. 10 minutes would be spectacular for both. By the time I go to the trouble of replacing worn belts it's been 30 years so I do all the bearings too.

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