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Brother CS-80 sewing machine bobbin winder not winding.

Discussion in 'Electronic Repair' started by David Farber, May 7, 2012.

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  1. David Farber

    David Farber Guest

    I don't know much about sewing machines but this does not seem like a
    complicated problem.Here are the pictures of the problem:

    The symptom is when you maually engage the bobbin winder assembly on the top
    of the machine and press the button to activate it, you can hear the motor
    turning inside but the winder does not turn. The first two photos show the
    faulty drive assembly removed from the machine. The last photo shows the
    assembly loosely installed in the machine. There is some mysterious black
    slime (could it just be lubricant?) which I thought must have been some kind
    of belt or idler that started disintegrating from age but the machine is
    only about 5 years old. The main belts are in very good condition so it
    doesn't make sense to me how this could have happened. If you poke the slime
    with a small screwdriver it doesn't make a really big mess on everything it
    touches like an old rubber belt does. You can see in the third picture that
    the area surrounding the part is fairly clean. I think that small black mark
    on the large gear to the left happened when I removed the part. By the way,
    the part in question is mounted on a plate that can be manually shifted up
    against the main gear assembly to get it to turn. I searched around for a
    parts diagram for this model but no luck. I know some of you that frequent
    this board have delved into sewing machine repairs and was wondering what
    this part is and how it interfaces with the drive mechanism to make the
    winder rotate.

    Thanks for your reply.
  2. David Farber

    David Farber Guest

    Hi Jeff,

    This machine was never opened before so I'm going to say that the wheel was
    made as cheaply as possible. It was stored for a while and maybe sitting
    around in the garage may have exposed it to temperature extremes. In any
    case, thanks for the great links. That allowed me to search for the rubber
    ($4 + $3.25 shipping) instead of the whole assembly (~$19 + $11 shipping).

    Thanks for your reply.
  3. N_Cook

    N_Cook Guest

    I've never sen te like of that, gooey rubber plenty of times.
    So all that model will go the same way. Presumably the result of
    over-plasticised plastic rather than a rubber formulation as you say it is
    non tacky. Whenever that happens with rubber then there seems to be a
    contagion that affects all the rubber bands in a piece of kit, perhaps not
    the case with what you have there
    I would get some small neoprene O rings and stretch 2 or 3 over the pulley
    to take up the width , if not enough diameter then 1 or 2 more stretched
    over that underlying layer.
    Then perhaps look out for a proper replacement
  4. David Farber

    David Farber Guest

    Hi Jeff,

    I actually did a bit more research after my last post to make sure I was
    getting the correct part. This place lists the tire as compatible with the
    CS80 model so I purchased it there.

    I really don't expect Brother, like many other companies, to make it easier
    for you to buy one small part off of an entire assembly when it can make
    more money selling the whole thing. This has been going on in the service
    industry since the beginning of time. I don't consider myself being really
    cheap. I consider it being smart. Speaking of cheap, how cheap was it of
    Brother to use a tire like that in the first place?

    Thanks for your reply.
  5. David Farber

    David Farber Guest

    I may have to resort to a home made repair as you suggested if the $4 tire I
    bought isn't a good fit.

    Thanks for your reply.
  6. N_Cook

    N_Cook Guest

    And is the "proper" replacement going to be plastic also?
    If you burn a bit of the gooed original is it a rubber or plastic smell?
  7. David Farber

    David Farber Guest

    I assume before the tire morphed into the tacky mess, it was made of rubber.
    The replacement I ordered will also be made of rubber. After a bit more
    research, this is the website where I placed my order.

    I already cleaned off the mess so I don't have any sample left to burn. The
    plastic pulley that supports the tire looks good and does not appear be
    deformed in any way.

    Thanks for your reply.
  8. N_Cook

    N_Cook Guest

    About 2 weeks ago an audio cassette recorder returned for repair. It was
    made in 1986 and I repaired it about 15 years ago using a 2 cents O ring,
    stretched onto the take-up spool pulley. Not bad for about 3 hours use a
    day, someone who never moved away from cassettes . That O ring had
    eventually split but no gooey mess, replacement one a bit thicker and a bit
    larger diameter
  9. Winston

    Winston Guest

    N_Cook wrote:

    I repaired 16 mm motion picture projectors in my yout.
    A *very common* problem was transmogrification of the
    neoprene drive wheels and belts into a gooey mess.

    A quick replacement, but a slow cleanup first. :)

  10. David Farber

    David Farber Guest

    When I first started out in the business (mid 1970's), I had an Ampex reel
    to reel machine come in for repair. Probably this exact model:
    I opened it up and I had to ask my boss what the gooey black stuff was
    inside the machine. To me, it looked like somebody had spilled sludgy motor
    oil into it. None of the belts were recognizable. I soon learned to stay
    away from those Ampex machines as every one of them had the same problem.
  11. did you work for NASA or some other goverment organization?
  12. This math is as nonsense as those "calculators" from places that do
    backups and datarecovery where you type in numbers and they claim you lose
    10% of your annual revenue per minute your computers are down or whatever.

    The only way it costs $75 to ship a box is if you factor in your 100
    million dollar failed SAP installation as part of your "billing costS" or
    whatever, and then blame the box for the expense.
  13. this would sound more reasonable, but it all depends on what the business
    does. Airlines barely function when their computers are running, shut them
    all off and they they just don't work at all.

    If your business is a tuckpointing company, it's doubyful you'd even know
    if your own website was down.
    this has to be a joke. If you're not from NASA, it's got to be lehman
    brothers, enron or arthur anderson to say with a straight face that it
    costs $300 to ship an iphone because the retail price is $500 and the
    phone costs $200 to make.
  14. David Farber

    David Farber Guest

    The new tire arrived and it fit perfectly. The dimensions of the unmounted
    tire are:

    16.5mm o.d.
    9.8mm i.d.
    3.7mm tire thickness
  15. So again, stating it costs $75 or $300 to ship an empty box is just pure
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