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  1. #31
    Join Date
    Aug 2008
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    near Rockhampton
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    The bevel gears have arrived and while they need deburring and not the prettiest gears I have ever seen they are better then I was expecting. They appear to actually be correctly cut on a planer.

    I am not sure how to position them relative to each other in the grabbox I have to make.

    20160608_091606.jpg
    Gold, the colour of choice for the discerning person.

  2. #32
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    Aug 2008
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    near Rockhampton
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    No I have not forgotten about this project. So I have done a bit more to it.

    I have mated up the old dead drill gearbox to the motor. I have also devised a way to make the bevel gears fit and mount it all to the rotary table.

    There was a bit of fiddling to make the adapter plate and the input gear is just loctited into the motor shaft.

    Testing proves it works well. The motor has no cooling as it is a treadmill motor, But I think I will be putting a cooling fan onto the rear, probably a high capacity computer fan or something like it so I still get high air flow when the treadmill motor is doing low RPM's.

    20161117_151918.jpg 20161117_151223.jpg 20161117_151209.jpg

    I still have to devise a way to provide lubrication oil to the table ways. It needs a constant flow as it runs on scraped ways.

    I also picked up another magnetic chuck controller off ebay. The magnet sticking works OK, but the release does not. It has a few basic electronic components in it like a triac, caps, resistors. I need Ray for a day to trouble shoot it for me
    Gold, the colour of choice for the discerning person.

  3. #33
    Join Date
    Aug 2010
    Location
    Near Bendigo, Victoria, AUS
    Age
    70
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    2,907

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    Hi Richard,
    did you find that the DC motor makes a strong humming noise when running on the controller you got? I think I have the same controller but I don't like the 50Hz hum it creates. I worry about the permanent magnets in the motor being 'demagnetised' slowly by the 50Hz DC supply....
    I'd be interested in your experience.
    Cheers, Joe
    retired - less energy, more time to contemplate projects and more shed time....

  4. #34
    Join Date
    Sep 2012
    Location
    York, North Yorkshire UK
    Posts
    5,097

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    Hi Joe,

    It sounds like the controller you have is a triac phase switched type. The 50 Hz wont harm the motor, but I agree that it is annoying. The sort of controller you really need is a "PWM" Pulse Width Modulation one. These effectivly switch a constant DC supply on and off at frequencies way beyond those that you can hear. By varying the width of the pulses the effective power to the motor is controlled varying its speed.
    Best Regards:
    Baron J.

  5. #35
    Join Date
    Aug 2010
    Location
    Near Bendigo, Victoria, AUS
    Age
    70
    Posts
    2,907

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    I think you are right, Baron. Mine is identical to the one Richard referred to in post #23: 1000W AC 220V to DC 0-220V Adjustable DC Motor Speed Regulator Controller Board | eBay
    But the one he showed in post #29 looks different. I wonder if that is a PMW controller.
    Cheers, Joe
    retired - less energy, more time to contemplate projects and more shed time....

  6. #36
    Join Date
    Sep 2012
    Location
    York, North Yorkshire UK
    Posts
    5,097

    Default

    Quote Originally Posted by jhovel View Post
    I think you are right, Baron. Mine is identical to the one Richard referred to in post #23: 1000W AC 220V to DC 0-220V Adjustable DC Motor Speed Regulator Controller Board | eBay
    But the one he showed in post #29 looks different. I wonder if that is a PMW controller.
    Hi Joe,

    The one in post 29, uses two TYN412 thyristors. So that is definitly a phase switched controller. Actually it would make a good stage lighting dimmer.

    The Ebay picture shows something different, so that could be either, its very hard to tell from those two pictures.
    Do you have any paperwork showing a circuit diagram ? If so I could take a look at it and try to determine what yours is.
    Best Regards:
    Baron J.

  7. #37
    Join Date
    Aug 2008
    Location
    near Rockhampton
    Posts
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    My speed controller is the same as this one www.ebay.com.au/itm/Input-AC220V-Output-DC-0-220V-Motor-Speed-Controller-1200W-/262557251130

    It says PWM but who knows. It does work and it hums a bit but it makes no different noise to say a variable speed electric drill.

    I have the motor coupled to the rotary table now. I just need to add a support bearing to the shaft that goes into the table drive. I have also added a fan to the motor. I can see now the variable speed is not really going to be that useful. Lets see if I can upload a video. I have never had any luck uploading videos to this site before.

    20161119_120639.jpg
    Attached Files Attached Files
    Gold, the colour of choice for the discerning person.

  8. #38
    Join Date
    Aug 2010
    Location
    Near Bendigo, Victoria, AUS
    Age
    70
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    2,907

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    Thanks for that info Richard and thanks for the video.
    Looksing great. I suspect whe you are machininig something on the RT, you will be glad for the variable speed.
    Cheers, Joe
    retired - less energy, more time to contemplate projects and more shed time....

  9. #39
    Join Date
    Sep 2012
    Location
    York, North Yorkshire UK
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    Hi Guys,

    Richard. Video is just fine. It certainly drives that table at some lick.

    Joe. PM sent.
    Best Regards:
    Baron J.

  10. #40
    Join Date
    Aug 2008
    Location
    near Rockhampton
    Posts
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    I got the last majpr piece of the puzzle for this tool a short time ago. It is an auto lubricator to pump oil to the plain bearing the table spins on.

    I just need pipe and wires now to finish it off. Of course now I find on ebay a chinese seller selling larger bevel gears which would be more suitable for this. I also picked up an extremely powerful computer fan for cooling of the motor.

    20161207_141320.jpg
    Gold, the colour of choice for the discerning person.

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