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circular saw brushes sparking

Discussion in 'Hobby Electronics' started by [email protected], Aug 28, 2006.

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  1. Guest

    Hi there. I'm trying to fix a (Skill) circular saw . There are loud (&
    bright) sparks coming from the brushes (so noisey I can no longer use
    it). I pulled out the brushes & there is lots of carbon so they are
    both still good.
    Any ideas of what the problem could be. Could it be faulty supression
    caps??
     
  2. Nigh on certain there are 'shorts' in the armature windings. To test for
    that requires a 'growler' which you will find at any reputable repair shop.
     
  3. two bob

    two bob Guest

    Hi there. I'm trying to fix a (Skill) circular saw . There are loud (&
    Sounds like a stuffed armature. Being a skill, just throw it away and buy
    another one. Skill are the 'Bic' of power tools.
     
  4. Kr

    Kr Guest

    Unless you have an extreme build up of carbon dust etc in there (which
    is very unlikely to do this) then you most likely have shorts in the
    motor windings, which create these sparks from the large current being
    drawn when the brushes pass over those sections..

    If this is a regular hand held circular saw, I would consider tossing
    it and buying a new one, as its unlikely to be viable to have it
    repaired, or motor re-wound. In my recent experience, DeWalt make
    excellent power tools (if you want to spend the $$)
     
  5. John Dunkley

    John Dunkley Guest

    If you was a handy man and wanted to try a fix you could remove the armature
    and use a hacksaw blade ground down on one end to a 'hook' and clean between
    the armature brass segments with this.

    Not for the faint hearted, but could work.

    JD
     
  6. atec77 #

    atec77 # Guest

    Very much depends how much use it gets , I might use my circular twine a
    year , so far the $38.00 on special GMC is going fine .
     
  7. Terryc

    Terryc Guest

    How many years for how many $$$$

    They look to be a lot of money for something that turns up alongside all
    the cheap chinese brands in all the local tool shops. where are they made?
     
  8. Cant say I've ever seen a brass commy :) but that aside, most modern gear
    (last 15yrs at least) has "flush" insulation designed to be worn away by the
    brushes.
     
  9. Mr.T

    Mr.T Guest

    ...
    Only worthwhile for tradesmen who will use them often enough IMO.
    (I have one of their routers, but I doubt I'll ever get my moneys worth out
    of it unfortunately :)
    So the shops offer you the alternative. What's your point?
    Nobody who has ever used one, would really compare them to the Chinese
    brands.
    However cheap tools do have their place for weekend handymen.

    MrT.
     
  10. two bob

    two bob Guest

    In my recent experience, DeWalt make
    DeWalt is only a viable tool for tradesmen, or people who have too much
    money. If you want a good saw, I would suggest Makita, closely followed by
    Ryobi for the home handyman who does a fair amount of work. If it is
    required for the once or twicw a year job, then go for the BMG or Skill.
     
  11. Terryc

    Terryc Guest

    It is hard to see any difference to justify their high price when
    compared to the other brands (ignoring yum cha's). I vaguely remember
    someone explaining they were asian made now.

    I've met a few tradesman who don't feel that way and just find it more
    economical to buy middle quality and use them up, then replace them. YMMV.

    That is always an interesting exercise; looking at just how badly made
    they are.
     
  12. Terryc

    Terryc Guest

    My high torque (triple geared) wrist snapper is Makita and it was/is
    worth the money. AEG, Ryobi, ???, ??, ??.

    The B&Ds were disasters.
     
  13. Guest

    The cheap Ryobi seems to be the same item as some of the Cheapy
    supermarket
    special, just a few cosmetic changes. The Ryobi drill press I have is
    Exactly the same as the Generic brand apart from 2 small bits of
    plastic.

    I'll probhably just buy a cheapy replacement. It only gets used 3 or 4
    times a year.
    The NZ Kmart advertising paower tools (incl saws) for NZ$25. Just how
    can they make them that cheap
     
  14. Kr

    Kr Guest

    True.

    I bought a DEwalt cordless drill in 1995 for about $450. Its still
    running well now, in spite of 11 years of regular use, being dropped
    etc. The drill also has a much better feel, and better control than
    the cheap ones I had used before and since the time.



    At the time they were advertised as being US made. I dont know about
    now. I would be very surprised if they (or anything else) werent made
    in china.
     
  15. two bob

    two bob Guest

    So the shops offer you the alternative. What's your point?
    Most of the tradies I know use Makita tool. With the battery drills, they
    use them til the batteries are knackered and buy a new replacement. Then
    they keep the new batteries and give the drill away.
     
  16. two bob

    two bob Guest

    The cheap Ryobi seems to be the same item as some of the Cheapy
    I think GMC were ownde by Ryobi at one stage to sell their lower end tools
     
  17. AIUI, the Ryobi brand was bought by a German who moved manufacturing
    to China, and as such the modern Ryobi stuff has no relation to the
    older.
     
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