3mm brass pipe banding question

I banded a 3mm brass pipe.

I bent over to do a 90 degree banding, but this is what happened.

I tried banding with heat, but the result was the same.
I want to do inner R3mm outer R6mm banding but it's hard

I need the help of model users.

Zitat von PAPA MUERTE

To bend that small radius, you need a special bendingtool.

Like this one here: https://fechtner-modellbau.de/1-Rohrbieger-f…m-Rohr-Alu/6868

Otherwise it will kink like in your pic.

First of all, thank you for providing valuable information~ But I tried that product. But I didn't get a good result.

Zitat von Southeast Trucker

Hi Braunie,

Fill the tube with sand and close the ends, and then use the bending tool and see the result.

Bernd

Thank you for your good opinion. A few others recommended the method as well. So I bought very fine sand to test the method. I will share the test results soon

Zitat von Braunie

Hei,

I had exactly the same issues. I also tried the Fechtner tool but it didnt work. Same result as you had.

I used a 6mm drill shaft and forced the pipe around it. But not in one go, more like every mm I bent a bit, moved it another mm , bent a bit and so on.

But still I didnt achieve a r6.

Greets braunie

It's so nice to be able to talk like this with the same problem as me. The pipe I have has an outer diameter of 3mm and an inner diameter of 2.3mm and a wall thickness of 0.35mm is very thin, so it seems to deform easily.