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  1. #1
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    Dec 2012
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    Default Electric motor popped

    I purchased an old hollow chisel morticer the other day and in the process of cleaning it up the motor popped and has stopped working. I was trying to put a new cord on and I think I crossed the wires. The capacitor did not blow open but if was quite hot for some time. It does not make a noise. I am enquiring if there is anyone in the Sydney/ Wollongong area that can help me with either fixing it or buying a new one.

    Any help in this matter would be greatly appreciated. I'll add photos of the motor tomorrow.

    Sent from my SM-G950F using Tapatalk

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  3. #2
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    Default

    DISCLAIMER

    No liability is accepted by UBeaut or the Wood Working Forum's administrators
    or moderators for advice offered by members posting replies
    or asking questions regarding electrical work.
    We strongly advise contacting a Licensed Tradeperson for all electrical work.
    WARNING

    Information supplied within posts is not to be considered as detailed formal instructions to complete a task.
    Members following such information do so at their own risk


  4. #3
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    Jan 2007
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    Katoomba NSW
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    Where in sydney?
    Those were the droids I was looking for.
    https://autoblastgates.com.au

  5. #4
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    Quote Originally Posted by NCArcher View Post
    Where in sydney?
    I am located in Wollongong however i work in the Sutherland area


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  6. #5
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    A couple of photos will help and we might be able to direct you what to check. I'm a bit far from the Gong and the Shire though
    Those were the droids I was looking for.
    https://autoblastgates.com.au

  7. #6
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    Dec 2012
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    Quote Originally Posted by Rambozo View Post
    I purchased an old hollow chisel morticer the other day and in the process of cleaning it up the motor popped and has stopped working. I was trying to put a new cord on and I think I crossed the wires. The capacitor did not blow open but if was quite hot for some time. It does not make a noise. I am enquiring if there is anyone in the Sydney/ Wollongong area that can help me with either fixing it or buying a new one.

    Any help in this matter would be greatly appreciated. I'll add photos of the motor tomorrow.

    Sent from my SM-G950F using Tapatalk
    Photos attached.


    Sent from my SM-G950F using Tapatalk

  8. #7
    Join Date
    Feb 2016
    Location
    Perth WA Australia
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    828

    Default

    I think they're after photos of your wiring...

  9. #8
    Join Date
    Nov 2011
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    Sutherland Shire, Sydney
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    71
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    1,301

    Default

    I have used Suann motor rewinders at Caringbah on quite a few occasions, usually for pool pump repairs, but have also had a couple of woodworking machine motors repaired. They have also supplied a 2nd hand 3 phase motor and VFD to convert one of the lathes at my wood club to variable speed operation.

    See Motor Rewinds Sydney| Pump Service Sydney- Suannrewinds for their details.

    Alan...

  10. #9
    Join Date
    Oct 2007
    Location
    Alexandra Vic
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    Looking at the pic of the keyed spindle with a drill chuck attached, I have a fairly strong suspicion that the motor that has failed is not the original, but one that has been slotted in as a make do, possibly in an attempt to convert the machine from 3 phase to single phase. From the name plate, the motor is designed to run at 2850 rpm, and obviously operates in direct drive, having the chuck fitted to the drive shaft as it has. The motor speed is too high for a drill larger than about 2mm drilling into wood, which is why there are few drill presses around rated for 2000RPM or higher. The small 'precision' or 'sensitive' presses that exist and feature higher speeds are primarily intended for drilling fine holes, where the rotational speed is appropriate. I would not like to attempt to create a 1/2in mortice with a mortice bit running at 2850 RPM, I suspect that smoke and ash would be the result.

    I suspect that the unit would have been fitted with an eight pole (about 720RPM) induction motor originally, or some form of fairly low speed universal motor designed to operate at low speeds. Finding a replacement universal motor in that speed range and a suitable size would not be easy I suspect.
    I used to be an engineer, I'm not an engineer any more, but on the really good days I can remember when I was.

  11. #10
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    Default

    Here is a photo of the wiring. Sorry


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  12. #11
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    It looks like a nice old mortiser but as Mal said, not the correct motor.
    The rubber insulation on that lead is cactus and may be the cause of a trip. Either way you would be better off finding a suitable motor rather than repairing the one you have.
    I would suggest a small 3 phase motor with a single to three phase VFD so you can adjust the speed. You may need to get the shaft machined to suit your chuck or buy a new chuck to suit the shaft on the new motor
    Those were the droids I was looking for.
    https://autoblastgates.com.au

  13. #12
    Join Date
    Feb 2006
    Location
    Perth
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    27,756

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    Well spotted on the motor speed Mal and I agree with NCA regarding the rubber insulation.

    If you decide to go with a VFD I'd recommend using a 1450 rpm motor as high pole/lower speed motors will probably be too expensive.

    Motors running on VFDs have lower power at slow speeds so if you start with a 2850 rpm motor and run it at 1/4 speed (720 rpm) using a VFD you will only have 1/4 the power.
    A 1450 RPM motor at 720 will still gave half its original power and should be enough for a mortiser.
    Some of this power can be recovered using a vector drive VFD.

  14. #13
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    Dec 2012
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    Quote Originally Posted by BobL View Post
    Well spotted on the motor speed Mal and I agree with NCA regarding the rubber insulation.

    If you decide to go with a VFD I'd recommend using a 1450 rpm motor as high pole/lower speed motors will probably be too expensive.

    Motors running on VFDs have lower power at slow speeds so if you start with a 2850 rpm motor and run it at 1/4 speed (720 rpm) using a VFD you will only have 1/4 the power.
    A 1450 RPM motor at 720 will still gave half its original power and should be enough for a mortiser.
    Some of this power can be recovered using a vector drive VFD.
    Thank you very much for you input. I have bee. Looking at vfd's and see they are about $165 for cheap ones. I was hoping to get out of this for a little cheaper. (I know it won't be, but at least it will be better)

    The motor that was in there was way to fast and and it did burn and send out a cloud of dust. I'll see if I can find a cheap 1400 rpm motor.

    Sent from my SM-G950F using Tapatalk

  15. #14
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