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  1. #1
    Join Date
    Aug 2006
    Location
    Melbourne
    Age
    47
    Posts
    2

    Default Cast iron repair for table saw arbor arm

    Hi All,

    I've found a fault in arbor arm in a table saw I purchased second hand which is causing a blade misalignment. For details on the fault look here.

    The only mechanism I can think of to fix the problem is to cut the component in half, bolt some steel plate onto it to get the alignment correct, then weld it back together.

    I realise that welding cast iron is quite a different animal to steel, but, can it be done with basic arc gear? I'm confident welding large section steels with my existing stuff, is it a simple matter of the right rods and a little cooling caution, or should I consider a different solution first?

    Dave.
    "Human beings, who are almost unique in having the ability to learn from the experience of others, are also remarkable for their apparent disinclination to do so."
    - Douglas Adams

  2. #2
    Join Date
    Jul 2010
    Location
    Melbourne
    Posts
    9,088

    Default

    Hi Dave
    I wouldn't cut the casting. I would bore it out and then sleeve it or make an oversized shaft to fit the new oversized bore.
    Welding cast can be done, but it my just move on you anyway and put you right back where you started.
    You're sure it isn't meant to be like that?(I cant see it you can) going back won't be easy.
    Stuart

  3. #3
    Join Date
    Aug 2006
    Location
    Melbourne
    Age
    47
    Posts
    2

    Default

    Quote Originally Posted by Stustoys View Post
    You're sure it isn't meant to be like that?(I cant see it you can) going back won't be easy.
    I'm sure it's not meant to be that way. This is the only critical dimension in the whole table that can't be adjusted by conventional means or with home workshop tools, it's also one of only two critical components that really need to be right from the factory, everything else can be corrected easily enough.

    I was thinking of having the bearing housing re-bored and fitting either sleeves or over-sized bearings, but the expense of this sort of operation could quickly outweight the original purchase price. Cutting and welding is attractive because it's cheap.

    If there's a better option I'm all ears.
    "Human beings, who are almost unique in having the ability to learn from the experience of others, are also remarkable for their apparent disinclination to do so."
    - Douglas Adams

  4. #4
    Join Date
    Jan 2008
    Location
    Murwillumbah Nthn NSW
    Age
    68
    Posts
    118

    Default

    I,ve brased cast iron with oxergen and LPG its easy enough but never tried with the arc . Did see some arc rods in Trade tools the other day for cast iron be interesting to here from someone that arc welds cast sometimes .

  5. #5
    Join Date
    Aug 2006
    Location
    Melbourne
    Age
    47
    Posts
    2

    Default

    The welding idea got ditched becasue it's too dangerous for the part. I've hacked 'engineered' another solution any way.
    "Human beings, who are almost unique in having the ability to learn from the experience of others, are also remarkable for their apparent disinclination to do so."
    - Douglas Adams

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