MEM Co. Ltd Auto Memota Starter circa 1950 Fault

  1. Chris F Member

    Messages:
    30
    Location:
    UK
    Hello,

    I have a circa 1950 Mk1 Kerry Engineering Super 8 pillar drill/drill press.

    I've almost completed restoration and it works perfectly! (There motor pulley is in conta 20201007_202458.jpg 20201007_205111.jpg 20201007_202458.jpg 20201007_205111.jpg 20201007_211501.jpg ct with the mounting bracket, which I'm in the process of fixing). However, the starter appears to be faulty. I cannot find anything really relating to this starter, bar one video on youtube



    I can't figure out what the problem is. One thing I have found is that the contacts must be clean and dirt free. I have stripped and cleaned the main contacts, but do I need to clean up all of the metal?

    Any advice would be really helpful. I'm not an expert in this at all, just a hobbyist fascinated with old machinery.

    I have over 100 photos of the restoration, but here are a few of the starter itself. Any ideas? Here is a video of it so you can see what I mean

     
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  2. Dcal

    Dcal Forum Supporter

    Messages:
    2,362
    Location:
    Antrim Northern Ireland
    The starters are really simple and robust.
    It could be that you are trying to run a 410v coil off 240v and there isn't enough current to pull the contactor in.

    Is it single phase or 3 phase.
    What coil is in it?
    You can get different coils to suit your application.
    I might even have a 410v one which probably isn't what you need.
     
    Chris F likes this.
  3. Chris F Member

    Messages:
    30
    Location:
    UK
    Hello,

    I have read about the 410v coils actually, but there was nothing written on the coil.

    Having said that, the plaque in the starter casing suggests the coil is 380-440 volts. Reckon that is the problem? 20201007_230000.jpg

    It is single phase
     
  4. daleyd

    daleyd Member

    Messages:
    7,107
    Location:
    Wrexham, North Wales
    It says “coil volts 380 -440” so definitely requires that rather than 230v. It “may” work with 230 but will probably be weak at best...
     
  5. Chris F Member

    Messages:
    30
    Location:
    UK
    Ah I see. So essentially I need to swap out the coil for a 230v coil? As per Dcal's logic?
     
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  6. daleyd

    daleyd Member

    Messages:
    7,107
    Location:
    Wrexham, North Wales
    Yeah I’d say so.
     
    Chris F likes this.
  7. Dcal

    Dcal Forum Supporter

    Messages:
    2,362
    Location:
    Antrim Northern Ireland
    The 410v coils have very fine wire.

    You need a set current to pull the contactor in.
    The 410v coil has a higher resistance so when you run it on 240v there is less current draw, so less pull.
    The 240s are lower resistance so end up drawing the same current and will work fine. (if you can get one)
     
    Chris F likes this.
  8. Chris F Member

    Messages:
    30
    Location:
    UK
    Okay great. The good news is you've both been immensely helpful, thank you.

    The bad news is these switches are like rocking horse sh*t.

    Hopefully there is a modern solution/replacement coil that will work.

    Thanks again,
    Chris
     
  9. Dcal

    Dcal Forum Supporter

    Messages:
    2,362
    Location:
    Antrim Northern Ireland
    You could rewind your own?
    Or put a small 240 to 110 transformer in reverse (shaver socket?) and use that to feed the coil,
     
  10. Chris F Member

    Messages:
    30
    Location:
    UK
    I honestly wouldn't know where to start. I'll read up on what you're suggesting and do some learning!
     
  11. Dcal

    Dcal Forum Supporter

    Messages:
    2,362
    Location:
    Antrim Northern Ireland
    I’ve had a looks through my electrical pile and have found a 240v coil and it’s testing OK (270 ohms)
    If you want to swap (so I have a coil if I want to use this again) I can send you the 240v one.

    IMG_3032.JPG

    IMG_3033.JPG


    I can send it to you anyway, if you want to try it and see if it sorts your problem.
     
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  12. barking mat

    barking mat Barking at Pigeons

    Messages:
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    Location:
    Brittany, The Arz Valley.
    Good man!
     
  13. Chris F Member

    Messages:
    30
    Location:
    UK
    Oh my! That would be amazing, you'd do that?! I'd appreciate it I could try yours first and then see. Would be happy to send my coil to you in return. I must admit, my coil doesn't quite look the same in terms of age/style (I'll get a decent photo as you can't really see it in this one).

    This would be brilliant. I'll cover all postage etc.
     
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  14. Dcal

    Dcal Forum Supporter

    Messages:
    2,362
    Location:
    Antrim Northern Ireland
  15. Chris F Member

    Messages:
    30
    Location:
    UK
    Ah, it won't let me view the attachments for some reason, I don't have the permissions.

    I'll be at the workshop tomorrow evening so I'll take mine out and post dimensions.
     
  16. Chris F Member

    Messages:
    30
    Location:
    UK
    Okay so, a friend has found an identical starter online - though it is the 240v version. The motor I have is rated 3.05 amps. If I were to take the coil from this starter and put it in my original starter, would that work? Does the coil have a part to play in the amps? Sorry for the naivety.

    I note that mine is a 44ADS and this one is a 152ADS
     
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  17. brightspark

    brightspark Member

    Messages:
    31,770
    Location:
    yarm stockton on tees
    no the coil pulls the contacts in that's all ,the bimetal coils operate the tripping current
     
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  18. Chris F Member

    Messages:
    30
    Location:
    UK
    Great stuff. Thank you for your patience!
     
  19. Dcal

    Dcal Forum Supporter

    Messages:
    2,362
    Location:
    Antrim Northern Ireland
    It won’t let me view them either, whatever I've done.
    Anyway I'll try again.

    IMG_3040.JPG

    IMG_3041.JPG
     
  20. Chris F Member

    Messages:
    30
    Location:
    UK
    I don't know how helpful this is, hopefully its clear enough
     
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