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Thread: Variable speed motor

  1. #1
    Boolit Master
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    Variable speed motor

    I have a brush AC 110v motor, from an air compressor.
    Trying to make it variable speed.
    I tried my router control and it did almost nothing.
    Tried a light dimmer switch, and it did bring it down, but not as much as I need.
    Doind this as cheap as possible.
    Any ideas???

  2. #2
    Boolit Buddy


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    Safest way to avoid motor damage is one of these...

    a VFD (variable frequency Drive)

    Sent from my SM-G960U using Tapatalk
    Last edited by JonB_in_Glencoe; 08-06-2018 at 05:22 PM. Reason: removed ebay link added VFD
    Dignified? I signed up for brave and courageous, not dignified!

  3. #3
    Boolit Master

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    Remember the slower you go the less torque you get. If you need torque for something better to gear it down with pulley and belt.

  4. #4
    Boolit Man
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    Single phase brushed motors can be controlled by a variac ( variable voltage transformer )
    But be certain it is a brushed motor. A brushless motor will burn up rather quickly if it isn't run fast enough to kick out the start windings .

    The router control won't work because it is for a dc motor .

    I went out and took a picture of a variac I have kicking around for visual stimulation.

    I can't say they don't make them , but I have never seen a vfd for a single phase motor
    Vfd's are for three phase motor in general .
    For smaller motors of less then 5hp there are plenty of vfd's out there that convert single phase into three phase making them really easy to use .

    Click image for larger version. 

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    Last edited by redneck1; 08-06-2018 at 06:27 PM.

  5. #5
    Boolit Buddy
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    What are you powering with it? I'm a member of Vintage machinery & Old wood Working Machines http://www.owwm.org/search.php?keywords=treadmill+motor Besides VFD's & Variacs the easiest speed controlled motors can be found for free in basements and bulk pickup piles. Treadmill motors are being used to power drill presses, lathes ect.
    Last edited by NyFirefighter357; 08-06-2018 at 08:36 PM.

  6. #6
    Boolit Master
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    He wants to get one of those .223 case trimmers like a Trim-it, or something like it.
    Thinks a hand drill will not be fast enough.
    He wants something spinning around 3000rpm.
    He saw it on utube.
    I don't think it needs much torque spinning that fast.

  7. #7
    Boolit Buddy
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    Dewalt 3/8" electric hand drill 2,500RPM

  8. #8
    Boolit Buddy
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    I tried putting one in a wood router, DO NOT TRY at full speed, it ripped it out and bent the shaft and flung it across the room. (Ruined it) I put variable speed router control on it and that works
    Electric drill is best option
    Last edited by Adam20; 08-06-2018 at 09:15 PM.

  9. #9
    Boolit Buddy


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    Quote Originally Posted by redneck1 View Post

    I can't say they don't make them , but I have never seen a vfd for a single phase motor
    Vfd's are for three phase motor in general ..
    They do make them, not the cheapest option for what he wants tho.

    Just google "115v single phase VFD"
    Dignified? I signed up for brave and courageous, not dignified!

  10. #10
    Boolit Master
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    I'm thinking 3000rpm is way to fast and dangerous.
    But for some reason he's stuck on that number.
    I've suggested to him many times, if he dead set on getting a trimmer like that, to get it and try different ways to spin it.
    I'm sure a power drill is way fast enough.
    He a newby to reloading, so he want the best.
    Just trying to help him out.

  11. #11
    Boolit Man
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    I use the Lee trimmer with a hand drill quite often , it works much better at lower speeds then it does running the drill wide open .

  12. #12
    Boolit Buddy
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    Easy to get pulleys to get to 3000 if he is hell bent on trying it. You could probably do it with a bicycle mounted on a stationary trainer. The goal should be to show him that he’s wrong at the lowest possible cost and risk, rather than try to build something durable but useless.

    If he wants the best, just have him buy the Giraud, it is a great tool!

  13. #13
    Boolit Buddy varmintpopper's Avatar
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    Perhaps the motor from a commercial sewing machine with the speed controlled with a resistive foot controller, That is what I use.

    Good Shooting

    Lindy

  14. #14
    Boolit Master popper's Avatar
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    At that speed he will burn out the cutter. Even at handheld drill high speed you have to keep the cutter lubed (cooled).
    Whatever!

  15. #15
    Boolit Buddy pete501's Avatar
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    You can find used treadmills often for free. Electric motor is variable speed and comes with the controller.

  16. #16
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    JonB_in_Glencoe's Avatar
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    Quote Originally Posted by popper View Post
    At that speed he will burn out the cutter. Even at handheld drill high speed you have to keep the cutter lubed (cooled).
    I agree...I use a battery drill with Lee tools for case trimming large quantities of cases...I think it works real well, I use the slow speed of the drill.

    Quote Originally Posted by varmintpopper View Post
    Perhaps the motor from a commercial sewing machine with the speed controlled with a resistive foot controller, That is what I use.
    Good Shooting
    Lindy
    I have read about others using a sewing machine motor and foot control for a trimmer station...If I were to make a trimmer station, that is the route I'd try first, because you can find old sewing machines for cheap or free
    ...and If I thought I needed 3000rpm ...I'd use a belt and pulley system...you could probably just reverse the pulleys from the sewing machine and use that belt.
    That's my 2

  17. #17
    Boolit Buddy
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    3000 is WAY too fast even for a carbide cutter. I use a high speed counterbore for a case trimmer and run it 4 to 5 hundred rpm. 3000 rpm will burn up a high speed cutter very quickly. (in just a few parts)

  18. #18
    Boolit Master

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    Look for a DC motor and controller they don't loose power when reducing rpms as bad as AC motors do. He may have the set up to power the cutter already in a table top drill press. A standard 1/4 hp motor and set of step pulleys will do the job and allow for some speed adjustment to experiment with. As will the drill press. run the tool there and see where it needs to run speed wise to maintain smooth cut with no grabing, chatter or stalling.

  19. #19
    Boolit Buddy
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    Quote Originally Posted by pete501 View Post
    You can find used treadmills often for free. Electric motor is variable speed and comes with the controller.
    I got one today. Was all taken apart to be removed out of a bedroom. Just took all the electronics.

  20. #20
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    I use treadmill motors as generators sometimes - 100V output at full speed on the one I used for that. I have found that for PC Board drilling, I can use a carbide drill at more like 4 RPS so 240 RPMs and it's plenty fast for my needs, doesn't have as many problems that way as a faster speed one. Doing something unusual in what I do though.

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