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Post by RichK on Fri Nov 01, 2019 6:23 pm

As you are finding it will be hard to get big radius on those benders as the bend radius is dictated by the  benders. Just take it very carefully with lots of little bends as unless the pipe is the exact size of the formers it will kink and crease.
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Post by BotleyBouy on Fri Nov 01, 2019 6:35 pm

After a bit of experimenting I marked off the outside radius of the tube in 50mm segments and a 50mm limit on the side of the former. I then moved the tube along one segment at a time and moved the bending arm to the mark on the former. I found that to get the radius to change I needed three marks on the edge of the former.
The tube I'm experimenting with is thin wall alloy and creases very easily on the inside radius. Each "mini bend" has a corresponding crease on the inside.
I'm now looking for some 25mm steel tube to practice with.

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Post by RichK on Fri Nov 01, 2019 7:11 pm

Looking at your picture are you using it with the alloy former on top of the pipe as the picture just shows the wheel on top of the pipe ?
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Post by BotleyBouy on Fri Nov 01, 2019 7:24 pm

The alloy former is fixed to the frame, the tube sits in this and the roller on the bending lever moves over the outside radius of the tube. Does that make sense?

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Post by RichK on Fri Nov 01, 2019 8:24 pm

You are a piece missing there should be a former which is usually alloy which has the curve of the pipe which goes on top of the pipe and that roller on the handle part turns down on to the flat top. That's why you are getting creases, also if the bender is 22mm or 28mm etc it will only bend properly those size pipe, you cannot put a 25mm pipe in a 28mm former, well you can but will crease and buckle.
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Post by RichK on Fri Nov 01, 2019 8:31 pm

If you look at the below link it shows the curved piece the pipe goes in and the former which goes on top.


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Post by BotleyBouy on Fri Nov 01, 2019 9:26 pm

Excellent. I'll source one. Many thanks  Smile

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Post by thomas winner on Mon Nov 04, 2019 10:53 am

I had a similar problem while making some for my boat, an Elysian 27. I too thought thin wall tube would be best.
I found each time I stopped the bend it left a crease .
By trial and error i found how much overbend was needed for each bend and went for it in one hit per bend . Got good results using tihs method but  can't gaurantee it. I would have thought by now you too would have a scrap lenght or two with which to practise.

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