bending 28mm tube with spring

[mutley racers]

Is the best way to do this by annealing tube first and cooling with water before insertion of spring and bending?

 

[Howsie]

Good luck with that. Borrow a 28mm bender IMHO.

 

[mutley racers]

Coming from a guy who does not wear knee pads.

Come to think of it, that's probably why you don't wear pads a. Not knackered from using springs

 

[kay-jay]

Anneal it first. Its usual to fill tube with sand.
Anneal it till it glows a nice red

 

[tamz]

The pipe these days is harder than it once was so you will probably have to anneal it. I've never bent 1" pipe with a spring for over 30 years. Fk that.

 

[Reg Man]

Always used a tripod bending machine up to 1"1/2. Wish I had never sold it on, but came off the tools years ago and would never use it, until now, as I have a bit of 28mm to install. OH 'well second best have to buy the expensive fittings.

 

[mutley racers]

Anneal it first. Its usual to fill tube with sand.
Anneal it till it glows a nice red

Fill it with sand, is this so it doesn't kink or something?

 

[mountainman]

Fill it with sand, is this so it doesn't kink or something?

It is.
But I wouldn't try it on 28mm, or for that 22mm either.

 

[tamz]

Fill it with sand, is this so it doesn't kink or something?

Different bending method. If you have a spring heat the pipe until cherry red and cool it. Stick the spring in and pulll your bend. Spend 10 minutes rubbing the heat marks off the pipe if you can see it.
Save up for a 2nd hand bending machine. Much easier and better bends than a hand bender.
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[happyflyer]

Is the best way to do this by annealing tube first and cooling with water before insertion of spring and bending?

What do you think we did before bending machine, sand load it yes, you would then need oxy acetylene to heat it up sand loaded and bend it on a bench, but like you say spring bend is OK, anneal it well till cherry red, you will need a big torch for 28mm copper and I mean big, about 25mm dia at least, cool it down quickly with water, I hope you are not trying a full 90 bend just offsets, if you want tight offsets keep the annealing to a short length or you will end up with long offsets. The copper will work harden fast on the first pull over your knee, you may need to anneal it again to bend further, make sure the spring is a good fit, if its going to ripple 28mm will certainly ripple. If you try and anneal 28mm with a standard Rothenberg bottle nozzle forget it, also anneal it indoors and wind outside won't cool it and you won't get the tube cherry red and in sunlight you won't know if it's cherry red or not. Sand loading any pipe cooper or steel is not for the untrained. If you fancy shelling out £1000 the Rems Curvo bends 28mm like shelling peas

 

[Ermintrude]

Always used a tripod bending machine up to 1"1/2. Wish I had never sold it on, but came off the tools years ago and would never use it, until now, as I have a bit of 28mm to install. OH 'well second best have to buy the expensive fittings.

Solder ring fittings cheap as oot at screwfix if u just need. Few? Or buy a hilmore off eBay/ loads of sparks selling theirs cheap then buy new guide and form , sell it again?

 

[happyflyer]

Blowtorch Max Sievert APH - YouTube Someone video of a Max Seivert petrol blowlamp, I still have mine, this will just about anneal 28mm and I mean just it would take 5 mins a bend in still air.

 

[Billy Bob Bob]

drive over it with a 2 and a half ton landrover.....,no hang on that may not work

 

[Markus]

With the additives in copper pipe now bending 22mm is hard work on a manual bender never mind 28mm and springs, assume you must have your reasons.

 

[AWheating]

ill sell you a 90 bend and 2 28mm end feed couplers if you want?

 

[TerryWaite]

Is there a reason you can't use fittings?

 

[stevetheplumber]

if your realy stuck lee two nineties used as a step up will make any angle

 

[Ermintrude]

Managed a massive offset by hand on 28mm before. 3m length in to scaffy tube bend tiny amount then pull out of tube a tiny bit and bend some more...... Works but its rough!

 

[tamz]

When i was serving my time we had an 1 1/4" spring. You stand on the pipe and pull it.

 

[mutley racers]

Well I bought a spring any way so shall give it a go. It is for a gas pipe so the less fittings the better.

Thanks guys. I shall see how it goes. Hilmor benders are expensive. Don't think my wife will let me buy one:-(

 

[AWheating]

Well I bought a spring any way so shall give it a go. It is for a gas pipe so the less fittings the better.

Thanks guys. I shall see how it goes. Hilmor benders are expensive. Don't think my wife will let me buy one:-(

tell her it will match her yellow bag and shoes.

 

[supper plumb]

he will have to buy the yellow bag a shoes first tho to sweeten the deal