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Wanted - Brass tube bending

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nick mordin14/11/2021 17:25:48
1 forum posts

Hi there - for a small project I'm working on, am wondering if someone has the skill and kit to bend 1m brass tube (12mm diameter with 0.5mm wall thickness). It isn't precision work that is required, just don't want it to kink.

I have the brass tube already and a simple picture is as follows:


thanks in advance, Nick

ega15/11/2021 10:08:53
2399 forum posts
196 photos

nick mordin:

Forgive me for not wanting to click on an unrecognized link from a first-poster, but could you put your drawing into JPG format (if not already so) and post it?

Requests of this sort are more likely to bear fruit if there is some indication of where you are - say, UK county.

I note you naturally want to avoid kinking but can you tolerate a slight necking effect? Those more knowledgeable than I would want to know the type of brass you have in mind.

pgk pgk15/11/2021 10:18:11
2431 forum posts
293 photos

12mm is within microbore plumbing size and the pic shows a decent radius (as opposed to many of the tight and weird shapes used for steam engines). It may well be more expedient to ask a local plumber to bend it for you for a drink.


Werner Schleidt15/11/2021 11:09:37
143 forum posts
179 photos

I think you have to fill it with fine sand and close the ends. It should be on the bended end for 10 centimeters longer to span it. And then you can bend it.


Bob Stevenson15/11/2021 13:13:55
579 forum posts
7 photos

There are five methods used in the brass musical instrument business;....

1) anneal the tube and then use finger pressure to bend around a plywood profile of the bend if the curve is not too extreme.

2) Fill with soap solution and freeze then bend as above.

3) Fill with molten lead, bend, then melt out the lead.

4) use a spring the closely fill the pipe while bending as does a plumber.

5) use a dry medium such as fine glass granules or sand, as mentioned....stopping the ends can be tricky.

Martin Connelly15/11/2021 13:38:34
2017 forum posts
214 photos

I have seen another method used in brass instrument tube bending. After the initial bend form is made the part is put in a mould and ball bearings are pushed through to push the tube into the mould walls. The first ball is to maximum size and subsequent ones are slightly under size so they fall out easily.

Martin C

bernard towers15/11/2021 14:04:35
398 forum posts
102 photos

Just fill with woods or fields metal , bend and melt out filler ,job done.

Nicholas Farr15/11/2021 15:42:05
3148 forum posts
1434 photos

Hi Nick, this might just do the job 12mm internal bending spring however, your pipe will need to be in the annealed state before you bend it by any method.

Regards Nick.

John Reese16/11/2021 00:31:04
1016 forum posts

Most brass tubing I have seen was hard drawn. Annealing would be in order before bending. The radius of the bend looks large enough to allow bending without the need for filling with sand, ice, Woods metal, etc. As the radius of the bend is not specified tbis is my best guess.

Robin17/11/2021 21:38:43
513 forum posts

I made a few bassoon style crooks at college, we used Wood's metal, worked a treat.

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