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Gluing circular saw aluminium casing

Discussion in 'Tools and Materials' started by not_a_plumber, 30 Nov 2018.

  1. not_a_plumber

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    Hello,

    I have a Hitachi C9U circular saw which I dismantled for another (now abandoned) project but in the process I had to saw off part of the aluminium case.

    The attached pic shows the approximate line of the cut in red.

    c9u.jpg

    The casing is aluminium and the gap left by sawing is probably < 1mm.

    I now want to reattach it and was wondering if something like 'J-B Weld' or 'Araldite Metal Repair' would be strong enough?

    Any advice or comments would be very welcome.

    Thank you,
     
  2. HERTSDRAINAGE2010

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    Do you like your fingers?

    Andy
     
  3. not_a_plumber

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    Thank you Andy. Have you had any experience of gluing aluminium?
     
  4. Burnerman

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    A difficult repair, that one especially with the roll pin doing something.
    Epoxy adhesives are as good as it gets if the joint is clean. Give the stuff plenty of time to cure of course.
    Any way of fabricating a bracket to help things along?
    John :)
     
  5. not_a_plumber

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    Hi John,

    The joint is recently cut, it is clean and rough (sawn finish) and can roughen up some more. I have plenty of clamps to help while the adhesive is curing but not real way of adding a brackets to help strength when glued.

    I have no experience of these mega-adhesives so it was more a question of whether they are are good as they claim to be.

    Thank you,
     
  6. lostinthelight

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    Forget glues, I use Lumiweld for such jobs but there are other alloy brazing kits.

     
  7. not_a_plumber

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    Hi lostinthelight,

    That's great, thank you. I had never heard of Lumiweld 'till now.
     
  8. Burnerman

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    I guess loads of practice would be needed here......aluminium just tends to collapse without warning when its heated like that......I can weld it (just) but it sure is an art!
    I think I'd be looking for a replacement casting in this case.
    John :)
     
  9. lostinthelight

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    I've been welding since the 60's and never really got consistent results welding alloy but been using lumiweld to braze it for 30years without a problem..it flows before alloy collapses. If you get it slightly out of line it can be reheated and taken apart.
     
  10. HERTSDRAINAGE2010

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    No experience with gluing aluminium, but loads of experience with other tradesmen who have lost a bit of an end of a finger or thumb due to careless with power tools.

    Andy
     
  11. big-all

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    thats the pivot point for the saw plunge action by the looks off it so quite a heavy load
    look up ebay for the exact same model spares or repair with something like a switch or electrical repair
     
  12. mattylad

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    forget glue, make a bracket that is bolted to both pieces or get a replacement - your life is not worth bodging it with glue.
     
  13. Tigercubrider

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    There are a couple as spares on ebay and one on cashconverters site for less than £50
    Factor in time and I'd buy something and repair by using a donor
     
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  14. JobAndKnock

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    That pin is the pivot point for depth setting and potentially takes a fair amount of load. If you use the saw to cut out, say, a floor and hit some metal or a hard knot in the cut the shock of a kickback like that could cause a glued (epoxy or other) joint to just fracture with "interesting" consequences, especially if you were dumb enough to be directly behind the saw at the time. Either replace the component with a new one, or get hold of a donor too and do a swap.
     
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