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Thread: Why Are Tool Post Grinders Belt Driven?

  1. #1
    Join Date
    May 2009
    Location
    N.W. Missouri
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    1,539

    Why Are Tool Post Grinders Belt Driven?

    I'm thinking of making a mount to use my Foredom rotary tool with the collet hand piece as a tool post grinder. All commercially made grinders are belt drive. Is there a reason for this?


    John

  2. #2
    Join Date
    Jan 2009
    Location
    Wichita Kansas
    Posts
    122
    Cost. A powered spindle suitable for use a a grinder would be $$$$$$$$$$.

    Bill

  3. #3
    They're belt driven to make it easy to change pulleys and speed, and still get full power.
    "Anything seems possible when you don't know what you're doing."

  4. #4
    Two reasons:

    1. You can change speeds by changing the belt pulley ratio(s).
    2. Vibration isolation. There are two reasons to be using a toolpost grinder: the first is to hit a very specific size, and the second is to obtain a good to very good finish.

  5. #5
    Biggest reason is so the motor is not in the way....

  6. #6
    Join Date
    Sep 2016
    Location
    Modesto, CA, USA
    Posts
    1,304
    Most are single phase so the belt drive helps smooth out the pulses which can be visible in the work.
    Bil lD

  7. #7
    Join Date
    Sep 2006
    Location
    L.A. (Lower Alabama)
    Posts
    210
    Also to get the motor drive out of the way and provide space.

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