DC Motor Power Supply/Controller?

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  • oznabrag
    Historical Illiterate
    • Nov 2008
    • 40801

    DC Motor Power Supply/Controller?

    OK, so the tinkering bug has bit, and I've decided to build a sander/grinder.

    Of course, I'd like to build a Jeremy Schmidt, but my metalworking mojo is simply not there.

    Yet.

    I scored a treadmill offa Craigslist for the steel and the motor/drive.

    It was free because it only runs for a few seconds before it displays an ErroR and shuts down.

    I have no electronics skills whatsoever, so I have stripped off the circuit boards.

    The way I see it, I should be able to get an adapter and a motor controller for dirt cheap if only I knew what I was looking for!

    The motor is 1.5 HP, 120VDC, and I need to run it off 120VAC. Variable speed is pretty much mandatory, IMO.

    I spent an hour on Google, Amazon and Ebay last night, and what I came up with ranged between $2k and $4K.

    A little rich for my blood.

    Do I need to wait for another treadmill that works right?

    What sort of gizmo should I be looking for? I have found that one can find just about anything on Google if only one knows what search terms to use.
    Rattling the teacups.
  • Paul Pless
    pinko commie tree hugger
    • Oct 2003
    • 124839

    #2
    Re: DC Motor Power Supply/Controller?

    Simpler is better, except when complicated looks really cool.

    Comment

    • oznabrag
      Historical Illiterate
      • Nov 2008
      • 40801

      #3
      Re: DC Motor Power Supply/Controller?

      Excellent!
      Rattling the teacups.

      Comment

      • Paul Pless
        pinko commie tree hugger
        • Oct 2003
        • 124839

        #4
        Re: DC Motor Power Supply/Controller?

        grainger has a good searchable database with multiple filters for input/output volts and amps, etc. . .
        you may find it useful to narrow your search

        When it comes to DC Motor Speed Controls, you can count on Grainger. Supplies and solutions for every industry, plus easy ordering, fast delivery and 24/7 customer support.
        Simpler is better, except when complicated looks really cool.

        Comment

        • oznabrag
          Historical Illiterate
          • Nov 2008
          • 40801

          #5
          Re: DC Motor Power Supply/Controller?

          Thanks, Paul.
          Rattling the teacups.

          Comment

          • Paul Pless
            pinko commie tree hugger
            • Oct 2003
            • 124839

            #6
            Re: DC Motor Power Supply/Controller?

            so is this gonna be a knife grinder/linisher?
            Simpler is better, except when complicated looks really cool.

            Comment

            • oznabrag
              Historical Illiterate
              • Nov 2008
              • 40801

              #7
              Re: DC Motor Power Supply/Controller?

              Originally posted by Paul Pless
              so is this gonna be a knife grinder/linisher?
              Yes . . .

              I guess.
              Rattling the teacups.

              Comment

              • bluedog225
                Tom
                • Mar 2009
                • 12124

                #8
                Re: DC Motor Power Supply/Controller?

                That item you linked is incredible.

                Comment

                • oznabrag
                  Historical Illiterate
                  • Nov 2008
                  • 40801

                  #9
                  Re: DC Motor Power Supply/Controller?

                  Originally posted by bluedog225
                  That item you linked is incredible.
                  You mean the Jeremy Schmidt 2 x 72 sander/grinder?

                  Yes.

                  A thing of beauty.

                  That kid keeps making attachments for it, too.

                  AND, it's not like they're 'attachments', you know?

                  He can go from a vertical platen to a horizontal in about 2 seconds. From the platen to a contact wheel or to any other configuration in about 10 seconds.

                  VERY carefully made, EVERY part adjustable . . . If I were rich, I'd buy one to stand in the corner of the living room.

                  With all the 2" bar stock he's got in that thing, with the stand and all, I'll bet it goes over 300 pounds.

                  Plans are now available for an improved "Gen 2" version of this belt grinder. You can read about Gen 2 and buy the plans (in metric or inch) here: http://jer...
                  Rattling the teacups.

                  Comment

                  • Stiletto
                    Grant S
                    • Jan 2003
                    • 11238

                    #10
                    Re: DC Motor Power Supply/Controller?

                    What was the power source for the original device at 120V DC?
                    There is nothing quite as permanent as a good temporary repair.

                    Comment

                    • oznabrag
                      Historical Illiterate
                      • Nov 2008
                      • 40801

                      #11
                      Re: DC Motor Power Supply/Controller?

                      Originally posted by Stiletto
                      What was the power source for the original device at 120V DC?
                      Uhhhh . . .

                      I plugged it into 120VAC, the circuit board did its electromagical dance, and the dang thing started turnin'!
                      Rattling the teacups.

                      Comment

                      • Paul Pless
                        pinko commie tree hugger
                        • Oct 2003
                        • 124839

                        #12
                        Re: DC Motor Power Supply/Controller?

                        you should be getting plenty of advertisements for ac/dc tranformersand motor controllers scrolling across the bottom of your woodenboat screen today

                        i know i am
                        Simpler is better, except when complicated looks really cool.

                        Comment

                        • oznabrag
                          Historical Illiterate
                          • Nov 2008
                          • 40801

                          #13
                          Re: DC Motor Power Supply/Controller?

                          Originally posted by Paul Pless
                          you should be getting plenty of advertisements for ac/dc tranformersand motor controllers scrolling across the bottom of your woodenboat screen today

                          i know i am
                          I should unblock the ads, just to see what's what!

                          I grabbed another treadmill offa Craigslist, BTW, this one wants 135VDC and makes 2.5 hp. Its controller is working just fine.


                          One unexpected bonus from this little adventure is the little gear motors that elevate/lower the incline.

                          They are 120VAC, and make 400 pounds of thrust. Complete with jack screw.

                          Another bonus is the treadmill belts. They are going to make EXCELLENT drawer liners!
                          Rattling the teacups.

                          Comment

                          • Paul Pless
                            pinko commie tree hugger
                            • Oct 2003
                            • 124839

                            #14
                            Re: DC Motor Power Supply/Controller?

                            Originally posted by oznabrag
                            Another bonus is the treadmill belts.
                            you might make a shop built veneer thickness drum sander

                            you know, for the future luthier in you
                            Simpler is better, except when complicated looks really cool.

                            Comment

                            • oznabrag
                              Historical Illiterate
                              • Nov 2008
                              • 40801

                              #15
                              Re: DC Motor Power Supply/Controller?

                              Originally posted by Paul Pless
                              you might make a shop built veneer thickness drum sander

                              you know, for the future luthier in you
                              If someone tells you or someone you love to 'find what you love and make a living at it', please give them a solid, right hook to the head for me, yes?

                              The thought of making just about anything out of wood makes me physically ill, anymore.
                              Rattling the teacups.

                              Comment

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