Author Topic: Bending small copper pipe.  (Read 531 times)

Offline Gas_mantle

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Bending small copper pipe.
« on: September 01, 2017, 05:47:37 PM »
Hi,

Can anyone please offer tips on how they accurately bend small copper pipe ?

I'm trying to put a few 90o bends in 5/32 pipe and although I'm using bending springs every bend seems to have a slightly different radius  :(  I'm heating the copper to ensure it is soft but still struggle to get matching results.

Is it simply a case of practice improves the results or is there some aid / technique that would help ?

Thanks
Peter.
« Last Edit: September 01, 2017, 06:09:32 PM by Gas_mantle »

Offline Bluechip

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Re: Bending small copper pipe.
« Reply #1 on: September 01, 2017, 06:05:20 PM »
Some time ago a set of nifty but very effective benders for small dia. tube were shown by, I think, Chuck Fellows.

Not too sure, maybe someone else remembers them or perhaps PM chuck.

Dave




Offline mklotz

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Re: Bending small copper pipe.
« Reply #2 on: September 01, 2017, 06:11:19 PM »
---
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Online b.lindsey

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Re: Bending small copper pipe.
« Reply #3 on: September 01, 2017, 06:14:56 PM »
Here are some plans that George Britnell posted a while back also:

http://www.modelenginemaker.com/index.php/topic,6789.msg138982.html#msg138982

Bill

Offline Gas_mantle

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Re: Bending small copper pipe.
« Reply #4 on: September 01, 2017, 06:32:32 PM »
Thanks guys,

I looked at the kind of thing Marv suggested but the usual big sellers in the UK don't seem to have much below about 6mm dia - there are a few brake pipe benders but nothing to suit 5/32. If I can find something at a reasonable price I'll buy one but if not I'll look at trying to make something as suggested.

Offline Bluechip

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Re: Bending small copper pipe.
« Reply #5 on: September 01, 2017, 06:57:11 PM »
I think this refers:

http://www.modelenginemaker.com/index.php/topic,9.msg3413.html#msg3413

But it's got the PB problem ...  :Mad:


Dave

Online b.lindsey

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Re: Bending small copper pipe.
« Reply #6 on: September 01, 2017, 07:08:24 PM »
Try Marv's recommended fix  that he posted today tor firefox. It just worked for me.I did something very similar to what Chuck did when bending the 1/16" OD copper tubes for the half scale Rudy's Radial build and it worked perfectly for me.

Bill
« Last Edit: September 01, 2017, 07:11:47 PM by b.lindsey »

Offline simplyloco

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Re: Bending small copper pipe.
« Reply #7 on: September 01, 2017, 07:19:13 PM »
Some years ago I designed and built a versatile bender that would bend any tube, up to 1/8" steel strip and sq section, provided a simple former was made for each application. It was well received on the MECH forum, and was published as a paid article in Model Engineers Workshop magazine.
I've got a pdf somewhere of the drawing if anyone wants to have a go at it!

Bender by inkaboat, on Flickr

benderBase by inkaboat, on Flickr


John
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Offline Bluechip

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Re: Bending small copper pipe.
« Reply #8 on: September 01, 2017, 07:43:22 PM »
Try Marv's recommended fix  that he posted today tor firefox. It just worked for me.I did something very similar to what Chuck did when bending the 1/16" OD copper tubes for the half scale Rudy's Radial build and it worked perfectly for me.

Bill

Not working for me  :'(      I'm on FF 55.0.2  says for 57+  :headscratch:

What level do you have?

D.

« Last Edit: September 01, 2017, 07:47:05 PM by Bluechip »

Offline Baron

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Re: Bending small copper pipe.
« Reply #9 on: September 01, 2017, 08:14:35 PM »
Try Marv's recommended fix  that he posted today tor firefox. It just worked for me.I did something very similar to what Chuck did when bending the 1/16" OD copper tubes for the half scale Rudy's Radial build and it worked perfectly for me.

Bill

Not working for me  :'(      I'm on FF 55.0.2  says for 57+  :headscratch:

I'm on 53.30 and it works just fine for me.  Debian Jessie, TDE desktop.


What level do you have?

D.
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Offline Ye-Ole Steam Dude

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Re: Bending small copper pipe.
« Reply #10 on: September 01, 2017, 08:15:44 PM »
Some years ago I designed and built a versatile bender that would bend any tube, up to 1/8" steel strip and sq section, provided a simple former was made for each application. It was well received on the MECH forum, and was published as a paid article in Model Engineers Workshop magazine.
I've got a pdf somewhere of the drawing if anyone wants to have a go at it!



John

Yes, I would like a copy of the .pdf when you find it.
Thanks
Thomas

Offline mklotz

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Re: Bending small copper pipe.
« Reply #11 on: September 01, 2017, 09:40:02 PM »
Working just fine on 55.0.3.
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Offline derekwarner_decoy

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Re: Bending small copper pipe.
« Reply #12 on: September 02, 2017, 01:59:50 AM »
Dubro brand ......5/32" and 1/8" OD tube benders......about $15.00 each......for brass and copper tube.....multiple totally repeatable bends for any steam plant ....[the pre annealing  :Mad: is absolutely critical]

Brass, anneal 2 or 3 times during a 90 degree bend.....crinkle free.....
[I found the K&S x 0.014" wall brass tube to have this ~~90 degree limitation before crinkle deformation]
Copper, anneal 2 or 3 times during a 180 degree bend.....crinkle free....

The aluminium handles unscrew from the former body to allow for two close spaced compound bends

Worth ever penny  :Love:

Derek
« Last Edit: September 02, 2017, 02:04:09 AM by derekwarner_decoy »
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Offline simplyloco

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Re: Bending small copper pipe.
« Reply #13 on: September 02, 2017, 07:33:42 AM »
Those look very handy indeed!
John
Hon. Sec. Southampton Society of Model Engineers
Thankfully, I don't have to do much!