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Bending styrene piping

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Pierre02/02/2011 16:31:27
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Hi
Anyone have any tips for bending thin styrene tubing without distorting the bend?
I've tried filling the pipes with salt but this didn't seem to work very sucessfully.
TIA
Pierre
neil howard-pritchard02/02/2011 18:09:52
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depends on the inside diameter, but if it's not to big..say 3mm or less......i tend to aneel some brass wire on the gas cooker, wait for it to go cold and then slide into the tube, and then bend it...........it doesn't crease or shatter.... thats even when bent through 180.( that's only when I don't need the tube to allow anything to pass through, such as goose neck vents etc.
 
I havent as yet tried it with a diameter of more than that on the inside.
neil
 

Edited By neil howard-pritchard on 02/02/2011 18:11:40

Colin Bishop02/02/2011 18:38:38
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It might be worth warmingt the pipe in boiling water as you bend it although you would still probably need a wire insert as Neil suggests.
 
Colin
Bob Abell02/02/2011 18:53:41
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Try thick cord?
 
Bob
Pierre02/02/2011 19:49:14
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Thanks Neil, Colin and Bob
I like the idea of using annealed brass wire and hot water. Will try as soon as possible. Not sure how one would push string through a small bore styrene pipe though!
Trying to make goosenecks for my SDM tug which is finally close to reaching completion.
Pierre
Telstar02/02/2011 23:36:07
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Hi Pierre
This extract is from Squires Tool catalogue don't know if these sizes would be helpful
 
MINIATURE TUBE BENDING SPRINGS a set of 5 springs which can be used for brass, copper and aluminium tubing from 1/16"-3/16" outside diameter. When the spring is placed around the outside of the tube it will support the tube and create a neat kinkless bend. Spring sizes:- 1/16", 3/32",1/8", 5/32" and 3/16".
 
CODE TYPE PRICE
MTBS15 Mini Tube Bending Springs Set of 5..................... £4.99
 
Cheers Tom
neil howard-pritchard03/02/2011 09:49:42
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they don't work on styrene though!,
 
and sadly don't work too well on brass and alli either........had some for years, and seldom use them as they tend to crimp the metal!!
 
and by wanting to bend the styrene ( or metal for that matter) in a form of 180 degrees the external spring benders would be absolutely USELESS as ( as stated in the instructions suppled with them, they will only bend to 90 degrees or just over, or the springs will not release from the tubing!
 
 
sorry to contradict you telstar, and for fear of yet another tonguelashing from you....I again speak from my own experience and passing that knowledge on for the help of others!!!.
 
 

Edited By neil howard-pritchard on 03/02/2011 09:55:08

Bob Abell03/02/2011 11:27:35
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Still think thick cord (washing line?) will do the trick........and it can be pulled out easily
 
If you coat the end with superglue....it can be tapered for easy insertion too
 
Bob
Peter Fitness03/02/2011 22:06:32
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I managed to bend some 12mm styrene tube for the RIBs on my patrol boat doing as Colin Bishop suggested. I used boiling water to soften the styrene, and carefully bent the tube by hand until the right angle was achieved. A lot would depend on how acute an angle was needed. As can be seen from the photo, I didn't have to bend the styrene very sharply.
 
Peter.
 

 
ashley needham04/02/2011 19:46:22
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7323 forum posts
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Perhaps, on the hot water front, a former could be filed up in wood, to the radius required, but with a semi-circular channel in it, like the curved formers on a full-size tube bender...this may assist in keeping the tube from creasing ??
 
Ashley

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