Peter Simpson 3 | 25/12/2021 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 B | 25/12/2021 16:32:43 |
![]() 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 3 | 25/12/2021 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. |
peak4 | 25/12/2021 17:40:05 |
![]() 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. |
Peter Simpson 3 | 25/12/2021 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. |
DMB | 25/12/2021 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 3 | 25/12/2021 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 Connelly | 26/12/2021 09:12:33 |
![]() 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. 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 Neighbour | 26/12/2021 11:04:34 |
135 forum posts 1 photos | You can also use this formulae Outer² - Ø / wall thickness = min bend radius
|
duncan webster | 26/12/2021 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 Farr | 27/12/2021 09:18:03 |
![]() 3988 forum posts 1799 photos | Hi Duncan, I take Outer² - Ø to mean outside diameter squared. Regards Nick. |
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