How to bend Exhaust Pipes

[srsupertrap]

My friend Mike shared this information with me . . . probably useful for someone on the site

"I'm sand bending the pipes ,first I weld a plate to the end of the 1 1/4in. emt than I fill it with sand ,pack it with a broom stick than put the fitting on the end (it's called a squash pipe)tighten down the bolt to compress the sand than heat it in the wood stove using the heat gun to stoke the flames when it turns red hot it can be bent without kinking it ."

 

[Adler]

Cant post images that exist in email (I assume thats what you did)

 

[srsupertrap]

Same Pics . . . should have known better

 

[chuck hahn]

And does any of the sand get hot enough to melt and adhere to the inside of the pipes????

 

[srsupertrap]

I don't know? But I will find out and report back

 

[still_bluenoser]

Very cool.

Thanks!

 

[boontonmike]

weld one end, bolt other, fire?

 

[chuck hahn]

Dude better be carefull fanning that wood stove too much. Build that super heated flu gasses like that and start a chimney fire, crack the mortar, or melt any metal stove pipes...pretty darn touchy there.

Edit:: Unless outside and just using the pot as the furnace.

 

[tkent02]

And does any of the sand get hot enough to melt and adhere to the inside of the pipes????

Sand melts at much hotter temperatures than steel.
It does not get that hot in this case.
This is an old technique but I didn't know you could bend pipes so sharply using it.

 

[chuck hahn]

Tom.I have also heard of the gunsmiths trick of packing a barrel with sand to straighten like a bent shotgun barrel.My granddad bent one once with his snowmobile ( long but funny story ) and the gunsmith told him he lacked it with sand and ran some sort of gizmo down the bore that straightened it back out. Any gunsmiths around that can add to this??? I was wondering about the sand V metal thing.

 

[Eli69]

is that EMT as in electrical conduit?

 

[brslk]

is that EMT as in electrical conduit?

That looks nothing like EMT. Why would you ask?

Bruce.

 

[Eli69]

"I'm sand bending the pipes ,first I weld a plate to the end of the 1 1/4in. >>>> emt <<<< than I fill it with sand ,pack it with a broom stick than put the fitting on the end .......

that's why......

 

[Guest]

This same process is commonly used to make bends in high pressure boiler tubes, using a bit different heat source. Works very well. Ray

 

[gsiwrite]

i knew someone that used a similar technique to bend chromoly pipes to make roll cages. it's almost a work of art to shape metal like that.