Fretting about a fret saw!!!

Discussion in 'General Electronics Chat' started by vane, Mar 14, 2010.

  1. vane

    Thread Starter Active Member

    Feb 28, 2007
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    A while a go my dad's fret saw's switch snapped off, just taken it out, turns out it is a 'J-NOBLE U85DR' which due to a quick google search, does not seem to be buyable. It says it is '6A/96A 250v'

    I am wondering whether anyone has heard of it, I will get some pics up.
     
  2. vane

    Thread Starter Active Member

    Feb 28, 2007
    181
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  3. bertus

    Administrator

    Apr 5, 2008
    15,649
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    Hello,

    I have taken one of the photos and enhanced the contrast so I could read the text on it.

    It is a 10K potmeter with a double pole swtich.

    [​IMG]

    Greetings,
    Bertus
     
  4. vane

    Thread Starter Active Member

    Feb 28, 2007
    181
    0
    Well it is mains, i am not sure what current it is, would it be the same as what the fuse in the plug says?
     
  5. vane

    Thread Starter Active Member

    Feb 28, 2007
    181
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    What we could do is seperate it, have a switch and a seperate potentiometer for the speed.
     
  6. SgtWookie

    Expert

    Jul 17, 2007
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    1,728
    Do you still have the part of the shaft that snapped off?

    If so, consider attempting to repair the switch/pot that you have. If not, you could substitute a piece of 1/4" hardwood dowel , or brass or aluminum rod stock.

    Were I to attempt such a repair, I would use a short piece of 1/8" round brass rod stock, and use coarse sandpaper on it to roughen up the exterior. Then using a drill press, drill a hole in the exact center of the broken halves of the shaft, being careful to not drill more than 1/4" into the pot/switch half. Then, use a small amount of suitable adhesive applied inside the drilled holes, insert the brass rod (it must be very clean, use isopropyl alcohol to remove finger oils) and allow to cure.

    A suitable adhesive may be Locktite, the type used for permanently securing screws. I have used this adhesive for many purposes, even including repairing leaky plastic carburetor floats.
     
  7. vane

    Thread Starter Active Member

    Feb 28, 2007
    181
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    we did have the original part but it seems to have gone walkies :s
     
  8. SgtWookie

    Expert

    Jul 17, 2007
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    Well then, you could substitute a piece of hardwood dowel, aluminum, etc. or even saw the shaft from another pot and drill it.

    The important thing here is to get the holes perfectly centered so that the two parts of the shaft when joined will be in perfect alignment. If the outer shaft is not aligned properly with the inner shaft, it will bind where the shaft enters the housing, and you won't be able to depress it far enough to engage the switch. Also, take care to not slop the adhesive on the outside of the shaft, or it will lock the pieces together.
     
  9. vane

    Thread Starter Active Member

    Feb 28, 2007
    181
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    Ah, i've found it, so what adhesive would you recommend? cause this will have to put up with push and pull force as well as just torque.

    We've got epoxy, super glue etc
     
  10. vane

    Thread Starter Active Member

    Feb 28, 2007
    181
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    Used some special plastic superglue, seems to have done the job for now, thank you for all your help!
     
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