OT: how to attach broken cast iron part

[Spud]

Are you sure its not cast Al or Mag? Would make alot more sense.

Never crossed my mind it was something else. Now that it has been mentioned it could be some other metal it seems very likely it isn't cast iron as it doesn't weigh what a cast iron part would.

 

[L Vanice]

Never crossed my mind it was something else. Now that it has been mentioned it could be some other metal it seems very likely it isn't cast iron as it doesn't weigh what a cast iron part would.

A magnet is a handy thing to have when you wonder if something is iron or magnesium.

Larry

 

[Spud]

A magnet is a handy thing to have when you wonder if something is iron or magnesium.

Larry

So now that is seems very likely to be die-cast Magnesium, is brazing still the best option?

Is there an adhesive that while not as good as brazing would still be quite effective?

 

[richard newman]

Before you go gluing this thing back together, gotta ask how it got broken? Any reason not to expect that to happen again?

 

[Mtndew]

So now that is seems very likely to be die-cast Magnesium, is brazing still the best option?

Is there an adhesive that while not as good as brazing would still be quite effective?

I would consult your local welding shop and ask them if it's possible, or if they even recommend it.

 

[just Dave]

E 6000 glue (available anywhere) and a binder like steel wool or some glass cloth, will stick it on and allow some gentle use.

 

[Spud]

Before you go gluing this thing back together, gotta ask how it got broken? Any reason not to expect that to happen again?

No idea how it was broken. I bought it like this. There isn't any other damage, bending or warping to the saw. This is the only damage.

 

[Scottl]

JB Weld on a suitably cleaned and roughened surface. I would also add some tiny countersunk screws into tapped holes in the reinforcing piece. After a full 72 hour cure it should be tougher than original.

One hint - I always bevel or round the edges of the reinforcing piece to prevent stress raisers at the edges. JB Weld will flex somewhat where a steel bar wouldn't.

 

[m-lud]

A piece of 1/8" aluminum plate on the underside with some countersunk screws tapped up into the meaty part of the broken piece. Then three button head screws down both sides through the cover. Some nice rivets wouldn't look to bad either.
Aso super glue or JB weld on assembly.

 

[john.k]

Magnesium goes dark grey on sanding ,aluminium stays shiny white........magnesium alloy is quite easy to weld with TIG,and can actually be oxy acetylene welded .......pre WW2 ,mag.was often used for massive car components ,such as worm drive diff housings,and crankcases.

 

[mattthemuppet]

A piece of 1/8" aluminum plate on the underside with some countersunk screws tapped up into the meaty part of the broken piece. Then three button head screws down both sides through the cover. Some nice rivets wouldn't look to bad either.
Aso super glue or JB weld on assembly.

yep, just what I said