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DIY variable speed disc grinder

Discussion in 'Shop Talk - BladeSmith Questions and Answers' started by autogateman, Jan 13, 2018.

  1. autogateman

    autogateman Rod Braud Knifemaker / Craftsman / Service Provider

    162
    Jan 6, 2017
    In my quest for flatness without a surface grinder, I bought a HF 12” disc sander a few months ago against the popular advice to not get a single speed. Well, although it’s orobably the most well made tool I’ve bought from HF, it removes material way too fast. I own a company that installs security gate systems and I come across small DC motors and gearboxes all the time and thought I’d try to build my own disc sander with one. I started off with this 1/2 hp 24vdc motor I got off of a used gate operator. B71E5CF1-BF97-4CE2-8102-31D3C9D1B9E5.jpeg
    I then found an 8” disc sander disc on eBay that only needed a shaft bushing to fit on the motor. 66740DB9-62E2-4280-B2B8-460B78A6FAC7.jpeg
     
    Natlek likes this.
  2. autogateman

    autogateman Rod Braud Knifemaker / Craftsman / Service Provider

    162
    Jan 6, 2017
    CB29C275-2A52-49BE-B969-5BC70ED4727B.png 67006B4E-B1B3-48BA-816D-193637A9BB87.png I found a power supply and PWM on Amazon and got them all wired up.
     
  3. autogateman

    autogateman Rod Braud Knifemaker / Craftsman / Service Provider

    162
    Jan 6, 2017
    The PWM has the speed control made in to the front and also has a brake.
     

    Attached Files:

  4. autogateman

    autogateman Rod Braud Knifemaker / Craftsman / Service Provider

    162
    Jan 6, 2017
    EBFF6045-EB3A-4AB6-ACEB-B7FEC12B84F6.jpeg For right now it’s bolted to my bench top but eventually it will be on a stand. Total investment $60 and it works beautifully!!
     
    Ken H> likes this.
  5. Ken H>

    Ken H>

    Dec 31, 2011
    Good job - Sounds like you did a good job.
     

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