Copper Tube Bending

[Bluechip]

Hi Troops

Just sorting out my home brew tube bender.

Few tweaks to do, but ....

Is there any laid down info re: Tube OD; Tube SWG ( AWG ); and minimum bend radius ??

Pic is of 5/16" OD x 18 SWG annealed copper tube.

It is 0.310" OD measured and the tube bend is 'flattened' to 0.316".
This is with a bend radius of 0.687".
ie the "U" bit is a 1 3/8" half circle. Or, at least the middle of the tube is ...

All sorts of stuff re: boiler tube dimensions, WP etc. but nowt about bend radii acceptable ??

Any pointers from the boiler geezers ??

Dave BC

 

[Bernd]

Try looking HERE Might help.

Bernd

[Bluechip]

Hi Bernd

Thanks for the link ..

Some very interesting info. on there.

One bit seems to explain why my tube tends to 'creep' a small distance in the direction of the bend.

BC

[dsquire]

Try looking HERE Might help.

Bernd

Bernd

Lot of good information on bending in there. I'll file that one away. Thanks 

Cheers 

Don

[Bernd]

Try looking HERE Might help.

Bernd

Bernd

Lot of good information on bending in there. I'll file that one away. Thanks 

Cheers 

Don

Hey I do surprise myself sometimes on finding good tid-bits like this.    Google is my freind, sometimes.

Bernd