Hi guys,

i need to have a section of RHS 20 x 1.5 bend half a circle with radius 80 mm.
Any suggestions-idea's other than impossible please?

Does it have to be strong/structural?
If not you could cut slits into one side and bend it, then weld it back together.

What part is it for.

It would be stronger to make up 2 'C' shaped bits of plates used as the upper and lower, and bend some 1" strap to make the sides. I don't think you could bend down to such a tight raduis without some serious bulges/splits.

80mm is a very tight bend cita... doing it marks way wouldnt be that hard either.

Professional fabricators use a special bending tool that neatly collapses the sides, allowing the piece to bend. Have a look at a stacking chair made of square steel to see what I mean (if it's got nice rounded bits, that is! )

David

Hi Cita,

Why don't you try Martin Keenan @ MK Engineering. He's pretty handy at bending tube and box section. The Indy and GT chassis both feature some nicely bent box sections.

HTH

Nick

It's a fair old trek to MK from Belgium.

quote:

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Originally posted by David Jenkins
Professional fabricators use a special bending tool that neatly collapses the sides, allowing the piece to bend. Have a look at a stacking chair made of square steel to see what I mean (if it's got nice rounded bits, that is! )

David

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80mm is doable for that size of tube with a square upsetting die, but the only problem is, 80mm is not a standard size; 75 is the closest.
If you have a tube bender, then you could turn a temporary die for it out of maple or beech which would last for quite a few bends.
You may be able to find an engineering works that could do it for you. As David Jenkins hinted, a steel furniture maker may be a good starting point.

Hi All,

As Mark suggests, make them from sheet.

I'v used 8 off 90deg bends on my chassis.
4 for the rear corners, 4 for the scuttle.
I made 2 rings, and after welding & cleaning up,
cut each ring into 4.The advantage of welding a
ring is that it does't distort out of shape.


Paul G
Rescued attachment RHS bend 005s.jpg

quote:

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Originally posted by 907
Hi All,

As Mark suggests, make them from sheet.

I'v used 8 off 90deg bends on my chassis.
4 for the rear corners, 4 for the scuttle.
I made 2 rings, and after welding & cleaning up,
cut each ring into 4.The advantage of welding a
ring is that it does't distort out of shape.


Paul G

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Thank you Rorty.

Paul G

ps You have just made me think of a new signature.

That is a very nice bit of work, I'd be dead proud of that!

Bloody hell!!! (sorry guys)

Paul THAT is a nice bit of metal working!!!

I never can get to that with my skills so instead i will try to bend the tube...probably without succes.