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  1. #1
    Junior Member
    Join Date
    May 2019
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    What causes backing plate failure

    I was using the Groits Garage 3” tool with 5000 grit sand paper. Plenty of soap and water for lube. Thing just came apart too hot to touch. I realise heat is what caused the failure but there was not much drag with 5000 grit sand paper considering I was using water and soap and keeping things wet.

  2. #2
    Senior Member
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    Sep 2018
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    Re: What causes backing plate failure

    Heat, forces and age.

    Take your pick. Two are caused by technique, the other can’t be avoided.

  3. Likes Paul A. liked this post
  4. #3
    Senior Member Paul A.'s Avatar
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    Dec 2007
    Tampa Florida
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    Re: What causes backing plate failure

    I have found torque and excessive heat. I have ripped out quite a few and know it was certainly my fault every time. It happens. I now keep several of each kind in my inventory.

    I know I exert a little too much pressure when trying to coax a little more cut out of a compound every now and then and because of age, it might tear a bit inside. Even though you say you weren't using much pressure it may have had a fatique failure inside a bit.

    I have now adjusted my technique to machine weight ONLY for ALL passes. I let those abrasives and pads work to do what they were intended to do. They don't need any
    coaxing by me.

    What was the brand of BP?

  5. Likes PaulMys liked this post

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