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  1. #16
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    Hi Ray, The voltages have changed a bit since the initial measurement.

    The OCV is around 130V.

    Operating voltage is 100V. Amps is 2.3 which is about right as the magnet is a 240W

    demag voltage is what the rheostat changes, but it is around 14V and goes lower from there.
    Gold, the colour of choice for the discerning person.

  2. #17
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    That all sounds about right, when you said it was 50V instead of the 100V, I was thinking the power supply might have been underrated for the chuck.

    All good.

  3. #18
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    In the quest for a motor to drive the table I have settled on one of these

    NEW Healthmate 2 Wire 500W 240V Constant Drive Brush Motor Treadmill Belt | eBay

    to be controlled by one of these

    Kemo M012 Power Control 110 240VAC 1200VA KI8346 | eBay

    The I just need a worm drive to gear it down to around 60-70rpm.
    Gold, the colour of choice for the discerning person.

  4. #19
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    plus a rectifier and maybe some capacitors and a choke, I imagine?
    Cheers, Joe
    retired - less energy, more time to contemplate projects and more shed time....

  5. #20
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    Possibly Joe. I chose this sort of motor after finding there is a fair bit of info about this style on the internet.
    Gold, the colour of choice for the discerning person.

  6. #21
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    Quote Originally Posted by .RC. View Post
    Possibly Joe. ...
    It's a DC motor, isn't it? The controller you linked to is AC in and AC out.
    Cheers, Joe
    retired - less energy, more time to contemplate projects and more shed time....

  7. #22
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    I see what you mean Joe. I have founds heaps of info on the net about these treadmill type motors, so will see how I go.
    Gold, the colour of choice for the discerning person.

  8. #23
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    I am always surprised as to what sort of electronic components are out there easily available on ebay.

    Have found all these controllers out there with varying voltage outputs, some do 220V, some do 180V some do 90V

    1000W AC 220V TO DC 0 220V Adjustable DC Motor Speed Regulator Controller Board | eBay
    Gold, the colour of choice for the discerning person.

  9. #24
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    So the 220V DC 500W Permanent Magnet motor turns up today. Looks pretty good actually. As usual these days the armature has not been varnished or dipped in anything. Is it worthwhile getting it varnished? Or paint it myself?

    20160314_175054.jpg
    Gold, the colour of choice for the discerning person.

  10. #25
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    Mmmm - the blue blobs are indicators of dynamic balancing. If you dip it, that will change the balance.... I'd be hesitant, unless you have access to re-balancing. On the other hand, the coils are clearly machine wound and tight. Maybe its not necessary for them to be 'glued' together. The downside of dipping is that there is more mass generating more centrifugal/centripedal force, pulling on the coil strands....
    In summary, I'd leave it alone.
    Cheers, Joe
    retired - less energy, more time to contemplate projects and more shed time....

  11. #26
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    Yes I thought they would be to do with a highly technical balancing technique of putting blue epoxy putty to balance

    I will leave it alone, and look into the worm gearbox next.
    Gold, the colour of choice for the discerning person.

  12. #27
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    Brisbane
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    G'Day RC,
    In regards to your worm drive quest, I have two worm drives from a Holden electric seat adjusting mechanism. I don't know what model.
    They are motor driven and the output shaft has a coarse thread on it. I think you could modify one of these to drive your chuck.
    I have been looking at them as I thought that someone who wants to make a power feed for a mill drill X or Y axis would be able to use them.
    Just have not gotten around to offering them on this site yet.
    Unfortunately I am overseas at the moment and will probably be away for another 3 weeks so I can't post a photo.
    You are welcome to them when I return if you want them, or since you probably want to continue with your project you might want to check out some of the wreckers in your area. I think the worm drive of these might be ideal for your project.

  13. #28
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    Thanks for the offer pcx. I think I will end up making the gearbox as of yet I am not sure what speed the DC motor I bought will do and am waiting on the controller to arrive from China. Then I can measure the speed and work out the reduction to get about a 60-70rpm output.
    Gold, the colour of choice for the discerning person.

  14. #29
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    The electric motor speed controller arrived. I connected it to the motor and testes it out and it works very well.

    The amount of torque the motor produces at low speeds is impressive, however I think some sort of cooling fan will be required.

    Top speed is 4500rpm, which I need to reduce to about 80.

    20160406_083053.jpg
    Gold, the colour of choice for the discerning person.

  15. #30
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    Things have progressed on the theoretical front. I have dug out an old heavy duty drill that had a burnt out armature. It has a double reduction in it and I have worked out it should put out something like 120rpm if connected to the motor.

    I have looked at bevel gears on ebay and picked a small 2:1 bevel reduction set from China. Bevel Gear Metal Gear 90° Angle 1 2 1 5M Modulus 15T 30T Teeth Bore 5 6 8 10 12 | eBay I expect quality to not be fantastic but at a slow RPM I hope they are adequate. Who would have thought they call them umbrella gears. I could have cut parallel depth bevels but I only own one single gear cutter and gear cutters are more expensive then the gears.
    Gold, the colour of choice for the discerning person.

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