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Thread: sander woes-part two

  1. #1
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    Nov 2006
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    Delton, Michigan
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    sander woes-part two

    well when i had peter here, we diagnosed the ROS sander that dies on me.. we have come to the conclusion that its the winding.. so here is what it does.. you start it up and winds up to speed ok. but as soom as you place on the wood it has no power, this is a 2 amp motor and the other one is a 1.7 amp motor and they both have alot of hours on them but the 1.7 actually has more as it was the first one here.. so you sparkies out there what gives a motor power and is this fixable? the armature and brushes look ok got a little blacking on the armature but peter said it was normal..
    If in Doubt, Build it Stout!
    One hand washes the other!
    Don't put off today till tomorrow!

  2. #2
    Join Date
    Jan 2011
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    Spitting distance north of Detroit Michigan
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    Larry, I don't believe it's a motor problem. The sanding pad rotation is free-floating. The sanders motor has no direct connection to make the sanding pad spin. The sander motor turns a counter-weight (eccentric housing), which the sanding pad is attached by a ball bearing (or bearings on some models). That bearing is mounted off-center to the axis of the counter-weight. As the motor rotates the counter-weight, the center of the sanding pad moves in a small circle around the axis of the counter-weight. The sanding pad is free to rotate on the ball-bearing, in reaction to friction created between the pad and the work piece. Some models also include a pad brake feature to limit maximum pad speed. This brake consists of an o-ring that provides resistance to pad rotation.

    I've fixed 2 different brands in the past by simply replacing the belt{actually an o-ring imo}, they stretch due to use &/or heat {usually caused by too much applied pressure during use}, and occasionally dust build-up on the ring can cause them to glaze over and allow slippage. Anyways take this with a grain of salt until those with more experience chime in.
    The perception of perfection is perfectly clear to everyone else

  3. #3
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    Nov 2006
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    well ken i have replaced the belt and the pad and it still wont work.. i will bring it along next time i am in your area, which looks like the wknd of the 7th. and you can see if yu can get it working..
    If in Doubt, Build it Stout!
    One hand washes the other!
    Don't put off today till tomorrow!

  4. #4
    Join Date
    May 2007
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    Re: sander woes-part two

    Sorry Larry, What are the brands and models of the sanders?

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    Darren

    To a small child, the perfect granddad is unafraid of big dogs and fierce storms but absolutely terrified of the word “boo.” – Robert Brault

  5. #5
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    Nov 2006
    Location
    Delton, Michigan
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    darren its a pc333, the motor winds up and then wont have power..
    If in Doubt, Build it Stout!
    One hand washes the other!
    Don't put off today till tomorrow!

  6. #6
    Join Date
    Jan 2011
    Location
    Spitting distance north of Detroit Michigan
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    I'd be glad to look at it for you Larry, if your antsy or bored you might also check out the lower bearing...part 11A here they have a tendency to freeze up and once in a while a good cleaning & lube will get things turning again...no, not that kind of turning
    The perception of perfection is perfectly clear to everyone else

  7. #7
    Join Date
    Jun 2008
    Location
    GTA Ontario Canada
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    Re: sander woes-part two

    Isnt there a time when these things find themselves in the garbage bin.

    I see i nice refurbed Bosch in your future. Checkout CPO bosch

    http://www.cpotools.com/bosch-recond...efault,sc.html

    Their recond machines are good and cheap. $60 is the most expensive one and i think they having free shipping.


    Sent from my MB860 using Tapatalk 2
    cheers

  8. #8
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    Nov 2006
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    Delton, Michigan
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    my problem rob isnt that i need to have this sander running its that i got paper for it and its brother i already have a couple bosch sanders that i use regulary but this sander is good for job site use..
    If in Doubt, Build it Stout!
    One hand washes the other!
    Don't put off today till tomorrow!

  9. #9
    Join Date
    May 2007
    Location
    Kansas City, Missouri
    Posts
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    The brushes look like they move ok in their slots? I've had grinders that would wind up and lose power, as the brushes were hanging up and not making full contact. Other than that, you'd need to test the coils on the armature with a meter to see if there is damaged windings...
    http://www.groschopp.com/how-to-check-a-motor-armature/
    Darren

    To a small child, the perfect granddad is unafraid of big dogs and fierce storms but absolutely terrified of the word “boo.” – Robert Brault

  10. #10
    Join Date
    Nov 2006
    Location
    Delton, Michigan
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    thanks darren, the brushes seem to move fine good length left and spring power, i am assuming it must have a bad armature.. will have to play sparky later
    If in Doubt, Build it Stout!
    One hand washes the other!
    Don't put off today till tomorrow!

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