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Need a new motor for South Bend

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  • #16
    Originally posted by RB211 View Post

    You can wire your new drum switch to control the VFD as well.
    I did this on my mill and used the factory fwd/rev switch on my Clausing lathe which was essentially some linkage leading to a drum switch.

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    • #17
      If you are new to this kind of stuff.....
      It is difficult to communicate to somebody
      that a single phase motor is a motor that
      USUALLY runs with a lot of noise and vibration.
      The ones that do not, are the very small minority.
      MOST single phase motors are noisy and vibrate.
      You really have to see a single phase motor and
      a 3 phase motor running side by side to appreciate
      the difference. I have seen a single phase motor
      running down on a concrete floor, and because of
      the hummm and vibrations, it actually very slowly
      moved sideways, ever so slowly. After a minute it
      might have moved 6". A three phase motor is very
      smooth. None of this hummmm and drum.
      Even had a piece of machinery running, say like
      a cheap single phase drill press or something?
      Do this test.... Turn it on and listen to it rattle and
      hummm. (Not the U2 record album). Then turn off
      the power switch. Instantly and before the pulleys
      coast to a stop, the noise goes away. The noise
      is not a mechanical racket, it is electrically derived.
      The evidence is that the machine gets measurably
      quieter the instant that you switch it off.
      (Most) single phase motors are horrible. Once you
      have seen the light, it will be obvious when someone
      turns of a single phase machine. Now wood working
      tools are generally loud anyways, and you rarely notice
      the extra noise and vibration from a single phase motor.
      But a more refined machine, like a metal working lathe
      or a precision grinder, sometimes a more violent mannered
      single phase motor can make a precision machine almost
      unusable. Ever use a single phase bench grinder that
      just had that back and forth drone? That is why your
      better engineered bench grinders, like Baldor, use capacitor
      run induction single phase motors. There is no start winding
      just a capacitor run main winding. These motors seem to
      be devoid of this 60 cycle resonant harmonic drone.
      They also have almost zero starting torque, but that's OK
      for a bench grinder. Of course 3 phase grinders don't have
      the drone. So get hip to the compromises that exist with
      single phase induction motors and get hip to how great that
      3 phase motors are, especially for machine tools.
      Yes using a VFD is totally worth the price if you don't have
      three phase. Some rotary phase converters are really
      crappy, but that is a whole nother deep subject.

      --Doozer
      DZER

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      • #18
        It is a known fact that one cannot get through life without a 3-phase workshop anymore than you could survive without an electric tooth brush.

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        • #19
          I recently upgraded my Jet 1024 from a 1ø motor to 3ø + VFD and am very pleased.

          I've always heard that used but usable 3ø motors are plentiful and cheap, but I haven't found that to be the case, at least for fractional HP motors. You may have to hunt if you want a bargain. Look for one locally on Craigslist. If you look on eBay, you'll find some with reasonable asking prices but unreasonable shipping costs, often greater than the price. But there's a merchant called Congruos eBay Stores that is reasonable on shipping. I bought a new 3/4 HP, 3ø motor for $55 and $30 shipping, which I thought was a bargain. Stocks vary of course, so you may have to watch for a while. (They have no suitable motors listed today, April 28, I just checked.)

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          • #20
            I've never seen a used 3 phase motor local to me, and if I did, I'd probably get a better deal on a new one.

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            • #21
              Originally posted by Tincamp01 View Post
              .................................................. ......... Would any 1725 rpm motor of 3/4 hp be able to run backward with the reversing switch? I was warned about that issue in the past by a guy who repaired electric motors.
              yes, there are some motors that are not reversible- they do not give access to the start winding .
              usually they have a shaft at both ends .. The name plate should show rev confections !
              Rich

              Green Bay, WI

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              • #22
                Originally posted by RB211 View Post
                I've never seen a used 3 phase motor local to me, and if I did, I'd probably get a better deal on a new one.
                The Junk yards that take in industrial scrap usually have a selection of 3 phase motors, all sizes... at least here in Wisconsin

                Rich
                Green Bay, WI

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                • #23
                  You can’t find cheap used 3 phase motors anymore because cheap VFDs that convert single phase to 3 phase made them much more valuable. At a previous job I designed small state of the art wastewater treatment plants and ran them on single phase with VFDs and 3 phase motors. We got one job because the competitors needed 3 phase and the power company wanted 500K to bring it to the site and nothing to get single phase!

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                  • #24
                    Originally posted by Doozer View Post
                    If you are new to this kind of stuff.....>>crappy, but that is a whole nother deep subject.--Doozer
                    Dang, Doozer. You musta swallowed a 'nice' pill this afternoon. Great writeup!

                    Southwest Utah

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                    • #25
                      Originally posted by Rich Carlstedt View Post

                      The Junk yards that take in industrial scrap usually have a selection of 3 phase motors, all sizes... at least here in Wisconsin

                      Rich
                      And you can't get in to them to buy anything.
                      CNC machines only go through the motions

                      Comment


                      • #26
                        Originally posted by The Artful Bodger View Post
                        It is a known fact that one cannot get through life without a 3-phase workshop anymore than you could survive without an electric tooth brush.
                        I’ve been fortunate over the years as I have had great success with 1ph motors on my Farm.I have ran across the odd one that did not run smooth.My 18x60 Lathe was equipped with 10HP 3ph and I installed a 5hp 1ph that has worked flawless.I had the Machinist come out to give me some advice that operated this Lathe at the Tool&Die Shop where I purchased it,he could not tell the difference with the 1ph motor.The old Doall I refurbished had a 1ph motor and I had it running on the floor when the owner showed up,he got down on hands&knees to see it ,as it was virtually silent.
                        Last edited by Tundra Twin Track; 04-29-2022, 10:20 AM.

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                        • #27
                          Originally posted by J Tiers View Post

                          And you can't get in to them to buy anything.
                          It is called making friends.
                          Every time I go to the scrap yard,
                          the guy who unloads me, I give him
                          $10 gratuity. Then I ask if he has some
                          steel or whatever, such and such a size.
                          I am never refused the opportunity to
                          look around and buy something out of
                          their yard. Try it. It works.

                          -Doozer
                          DZER

                          Comment


                          • #28
                            Originally posted by chipmaker4130 View Post

                            Dang, Doozer. You musta swallowed a 'nice' pill this afternoon. Great writeup!
                            Nope. Not really.
                            Just another opportunity for me to bitch about ignorant people and their
                            unwillingness to actually accept new information.(if you read between the lines)

                            --D
                            DZER

                            Comment


                            • #29
                              Originally posted by Doozer View Post

                              It is called making friends.
                              Every time I go to the scrap yard,
                              the guy who unloads me, I give him
                              $10 gratuity. Then I ask if he has some
                              steel or whatever, such and such a size.
                              I am never refused the opportunity to
                              look around and buy something out of
                              their yard. Try it. It works.

                              -Doozer
                              Yep - and you've got to speak the right "language". If you come across as some looky-loo or weekend warrior that is likely to stub their toe and then sue the place, they'll never let you in.

                              Comment


                              • #30
                                Many SB9s had motors with 3/4" shafts. Those aren't easy to find, being a non-NEMA shaft size.
                                I vote you fix the motor you have. You might learn something.

                                metalmagpie

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