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Minimum bending radius

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Peter Simpson 325/12/2021 15:47:33
122 forum posts
2 photos

Hi does anybody know what the minimum bending radius for 6 mm OD x 1mm wall thickness Stainless steel tube ?

Jan B25/12/2021 16:32:43
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43 forum posts
11 photos

My RIDGID tube bender for 6mm tubes has a bending radius of 16 mm. The radius is measured to center of tube. When I make my own tube bender, I use a radius of 3x tube diameter and that works fine.

Jan

Peter Simpson 325/12/2021 17:29:07
122 forum posts
2 photos

Cheers Jan. I was hoping for a a bit tighter radius. I will have to do some silver soldering.

peak425/12/2021 17:40:05
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2207 forum posts
210 photos

Just out of curiosity, as I didn't know the answer myself, I highlighted the relevant part of your question, and right clicked-search.
"minimum bending radius for 6 mm OD x 1mm wall thickness Stainless steel tube"

It took me straight here, to a pdf download which suggests 2x tube diameter.
https://www.listertube.com/links/tube-bending-design-guide/

Interesting document, overall, but see P14 to start

Bill

Peter Simpson 325/12/2021 17:53:11
122 forum posts
2 photos

Hi Bill I eventually found that page myself. So minimum "U" bend would be 30 mm OD. Still too wide for superheat tubes as the Super heater flue tube is just less than 25mm diameter.

DMB25/12/2021 21:07:41
1585 forum posts
1 photos

Peter, are you talking about the firebox end of the superheater? My commercially supplied stainless one has a large ish rad on both tubes which appear to have been welded to a spear point.

John

Peter Simpson 325/12/2021 21:19:05
122 forum posts
2 photos

Hi John,

Thanks for the reply, My 5" gauge Don Young BR Standard 2 has 1" OD Super heater flue tubes. The super heater tubes are 7/32 OD. Looking at min radius of the tubes I will have to go for silver soldered copper or stainless steel spear head super heaters.. I have never silver soldered Stainless steel but using the correct flux should not be a problem. I have a Mig welder but would not be confident welding them.

Martin Connelly26/12/2021 09:12:33
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2549 forum posts
235 photos

The bend radius you can achieve depends on how you bend it, supported or unsupported internally, as well as wall thickness, outside diameter and material.

This was the cardboard computer I used at work to decide what tooling needed buying if a new part was designed outside of the existing product designs.

img_20171110_165435.jpg

img_20171110_165500.jpg

img_20171110_165519.jpg

I can't find it at the moment but you can figure out from the pictures what would be possible for an unsupported bore. Beyond that there are a number of ways to support the internal bore to avoid wrinkling that have been covered in a number of threads.

Martin C

Steve Neighbour26/12/2021 11:04:34
135 forum posts
1 photos

You can also use this formulae wink

Outer² - Ø / wall thickness = min bend radius

duncan webster26/12/2021 16:24:50
5307 forum posts
83 photos
Posted by Steve Neighbour on 26/12/2021 11:04:34:

.......

Outer² - Ø / wall thickness = min bend radius

Ø =?????

Nicholas Farr27/12/2021 09:18:03
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3988 forum posts
1799 photos

Hi Duncan, I take Outer² - Ø to mean outside diameter squared.

Regards Nick.

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