Bending tubing

[fatboy999]

How do you bend 1.90mm brass tubing to a 90 degree bend without cinking or colapsing the tubing?

[patmat2350]

As usual, it all depends!
Commercial bending tools have dies and wipers that support the tube while bending. You can buy hand tools for the job, usually down to 1/4" though. The coil spring things have never worked for me.
In bigger tubes, you can fill with salt or sand, solder the ends, then bend.
Here:
http://www.shipmodels.info/mws_forum/viewtopic.php?f=13&p=256694#p256432
(2nd picture) I bent 1/8" tubing, but:
- Annealed it first (red hot then cool),
- Then bent it around a large radius.

[steveciambrone]

Dubro makes two bending tools, work very well, the small one is 1/8".

The main trick is to anneal the brass to make it soft for bending, must be heated until red hot with a torch, then let cool. It will then bend easy.

Steve