Glue for Castings

[Rhyolith]

I broke a small casting, I think iron. As its not that big and the brake is very clean I was thinking I could glue it back together. Whats the best sort of glue for this? Ideally something cheap thats widely available.

 

[Jacob]

Somebody mended a snapped in half spokeshave for me by brazing. Seemed to work very well I've still got it 20 years on. I think glue would only be temporary.

 

[Rhyolith]

I don't know anyone who could do that for me.

 

[DTR]

You could try silver-soldering, which is similar to brazing and is very strong. It can be done at home using a common plumber's blowtorch if it's only a small repair.

 

[marcros]

i snapped a casing on a motor mount for my lathe. I used jb weld, and it did exactly what i wanted it to. I got it from ebay, but i think that motor factors may keep it or similar.

 

[AndyT]

Assuming it's not under stress, isn't this the sort of thing where cyanoacrylate (superglue) works ok? Or else epoxy, if you can clamp it hard enough to get a thin glue line.

 

[Rhyolith]

I don't have any blow torches or welding equipment, the latter is on my long term to get list.

I was thinking maybe some epoxy, but was not sure how well it works on metal. Getting a fine glue line will not be difficult.

 

[ColeyS1]

Following with interest.

J.b weld looks the easiest option so far.
Coley

 

[adidat]

coley that looks like its doomed! i doubt a repair would be strong enough for that, I may be able to knock one up on my milling machine.

adidat

 

[ColeyS1]

coley that looks like its doomed! i doubt a repair would be strong enough for that, I may be able to knock one up on my milling machine.

adidat

Yeah most likely- I'd only just reground and sharpened it, put it down on my bench to do something and heard a click. I'll try jb weld and if that fails just attack a piece of metal with a file.
I use the plane once in a blue moon, handy to have though...
Cheers
Coley

Sent from my SM-G900F using Tapatalk

 

[sunnybob]

Ryolith.
you have to be sure what it is to make a good repair. If its iron a magnet will stick to it.
If the magnet falls off its most likely alloy. Could even be zinc or just potmetal. Show us a picture.

Epoxy 2 part glue will fix either, but it helps to buy the glue thats specific for the metal.

Check on the instructions what the working time is. Most are 5 to 10 minutes, but some are almost instant stick.

Mix up a lot, spread it well into the crack. Squeeze it tight and leave it alone for at least 24 hours. you can clean off excess afterwards (unless its a complicated piece with fine indents, in which case clean of as much as you can before making the final alignment)

 

[garethharvey]

Have literally just finished gluing the posts on my balustrade. This is the stuff I used, it's awesome and incredibly strong. Don't see why it wouldn't work for you: http://www.ebay.co.uk/itm/Loctite-6...al-Adhesive-Retainer-Glue-50-ml-/400322473025

Have used this to glue the top fittings in to the upright posts.

 

[Lons]

I used JB Weld to stick tungston carbide tips to 10mm rod for use as the rear ghuides on my Startrite 352 bandsaw, works perfectly.

 

[Rhyolith]

...Show us a picture.

Untitled by Rhyolith, on Flickr

Don't ask how that happened... save it to say it was stupid #-o

Have literally just finished gluing the posts on my balustrade. This is the stuff I used, it's awesome and incredibly strong. Don't see why it wouldn't work for you: http://www.ebay.co.uk/itm/Loctite-6...al-Adhesive-Retainer-Glue-50-ml-/400322473025

Have used this to glue the top fittings in to the upright posts.

This looks like the kind of thing I am after, though it does say its meant for cylinders. Would this matter?

 

[katellwood]

...Show us a picture.

Untitled by Rhyolith, on Flickr

Don't ask how that happened... save it to say it was stupid #-o

Have literally just finished gluing the posts on my balustrade. This is the stuff I used, it's awesome and incredibly strong. Don't see why it wouldn't work for you: http://www.ebay.co.uk/itm/Loctite-6...al-Adhesive-Retainer-Glue-50-ml-/400322473025

Have used this to glue the top fittings in to the upright posts.

This looks like the kind of thing I am after, though it does say its meant for cylinders. Would this matter?

Have you considered a couple of steel dowels to bridge the break prior to gluing/brazing

 

[Rhyolith]

I am hoping to get away with just some glue.

 

[Inspector]

This looks like the kind of thing I am after, though it does say its meant for cylinders. Would this matter?

The Loctite is meant to hold bushings or pins in a hole. It isn't going to work on your broken crank. I doubt structural epoxy like the JB Weld, Devcon, Araldite and Scotch Weld will hold up to use either. Adding pins to the epoxy may work for a little while but there isn't much material to work with to align and drill. If you can remove the wooden handle Silver Braze/Solder will hold as will Tig welding by someone very experienced with cast iron welding.

Pete

 

[Rhyolith]

This looks like the kind of thing I am after, though it does say its meant for cylinders. Would this matter?

The Loctite is meant to hold bushings or pins in a hole. It isn't going to work on your broken crank. I doubt structural epoxy like the JB Weld, Devcon, Araldite and Scotch Weld will hold up to use either. Adding pins to the epoxy may work for a little while but there isn't much material to work with to align and drill. If you can remove the wooden handle Silver Braze/Solder will hold as will Tig welding by someone very experienced with cast iron welding.

Pete

Well i would need someone to do this for me, i don't know anyone who could or would.

 

[worn thumbs]

It looks unlikely to succeed to my eyes even if you can get a better epoxy than the stuff sold to the public.Brazing might work,if you can find somebody willing to do it.Welding definitely wont work.

 

[-Matt-]

Welding definitely wont work.

I beg to differ and if the OP were closer I would offer to do it for him.