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Motor Speed reduction gearbox

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  • Motor Speed reduction gearbox

    I’m looking for a speed reduction gearbox to reduce the rpmof a ¼ hp AC 1725 rpm motor to about 40 rpm. I have searched online and pricesare amazing.
    The application is a sand muller for my foundry. Anyone know a good source for said gearbox?Anyone have plans that a novice could follow to build one?
    Chuck

  • #2
    www.surpluscenter.com

    Or make one using v-belts, I would guess you will need at least a double reduction for that.

    http://www.surpluscenter.com/40-1-RA...ProductDetails
    Last edited by Shade; 10-04-2013, 09:00 AM.

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    • #3
      Gear boxes with that big a reduction are by the nature going to be expensive unless you can find one in
      military surplus somewhere. It's too large for a reasonable belt drive reduction. So that leaves a "home
      built" reducer. A worm drive would be my solution. A 1/4 HP would not be too difficult to build. Still
      will cost a bit for the gears.
      ...lew...

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      • #4
        If you have to buy gears it would be cheaper to buy finished product. I have bought and used the reducers from Surplus center found nothing wrong with the reducers. Have also cut my own gears and made reducers, but by the time you add in the case, bearings, gears and time Surplus Center is cheap.

        Bob

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        • #5
          Lots on ebay, some of the ideal ones are planetary by Bayside or Alpha gear etc.
          Max.

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          • #6
            Transmission from an old wringer washing machine.

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            • #7
              All the old wringer washing machines around here have been made into power hacksaws!

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              • #8
                Depending on how much space you have for the pulleys, a pair of 2" and 12" would give you 47.5 rpm.
                Kevin

                More tools than sense.

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                • #9
                  Unless you need to go straight through, look for a 'right angle drive'. They are compact and use a worm/wheel arrangement, and are often sold surplus for under $50. A 40:1 ratio is fairly common and would get you close.
                  Last edited by chipmaker4130; 10-05-2013, 01:07 AM.
                  Southwest Utah

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                  • #10
                    a used car windsheild wiper motor and gear box assembly, certainly cheap !!! might be able to use just gear box, as motor is 12V.or just use a 120V to 12V inverter.Or try a FWD self propeled lawn mower gear box,most already come with one pulley mounted.Both of these are dirt cheap and continuous duty use.
                    Last edited by madokie; 10-05-2013, 01:14 AM.
                    FORD BEATING JAP CRAP SINCE 1941!! CAROLYN JONES(1930-1983 actress)may this lady never be forgotten.

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                    • #11
                      For a sand muller Id just go with the belt reduction. Keep it simple. Its a dirt op JR
                      My old yahoo group. Bridgeport Mill Group

                      https://groups.yahoo.com/neo/groups/...port_mill/info

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                      • #12
                        If you have the space for it and don't mind a junkyard solution, you can get a large speed reduction using an old car engine flywheel and the pinion from the matching starter. I saw that done once to gear down the drive on a bandsaw for metal cutting, worked great. The most direct route is still likely an ebay or surplus center worm drive though.

                        Let's see pictures when you have you muller done!

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                        • #13
                          Originally posted by JRouche View Post
                          For a sand muller Id just go with the belt reduction. Keep it simple. Its a dirt op JR
                          A 43:1 reduction with multi stage belts would not be all that simple!

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                          • #14
                            Originally posted by cameron View Post
                            A 43:1 reduction with multi stage belts would not be all that simple!
                            Either 2x 6.5:1 reduction, or 3x 3.5:1 reduction.
                            1601

                            Keep eye on ball.
                            Hashim Khan

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                            • #15
                              One of the problems with a multi stage belt reduction would be the torque to be handled on the slower stages. The suggestion of alanganes of using a starter pinion and flywheel is a good one. One belt reduction to drive the pinion at the required speed.

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