Page 2 of 2

Re: 1" U in 1/4" copper tube

Posted: Wed Jul 11, 2018 2:10 pm
by gwrdriver
LivingLegend wrote:
Wed Jul 11, 2018 6:02 am
Keeps the ice from cracking.
My guess would be that the detergent doesn't freeze and provides a lubricant to allow slip movement between the ice and the tube as the bend is made.
I'll be that somewhere in the Blogoshpere there'is a YouTube on "How Horns are Made."

Re: 1" U in 1/4" copper tube

Posted: Wed Jul 11, 2018 3:23 pm
by Harold_V
Thanks. Interesting subject.
I once was successful in a bid for making several fuel lines from ½" aluminum tubing (defense contract).
Fuel line.JPG
A fixture was built that allowed the bends to be created without filling the tubing. I also built several formed tubes for the Bell helicopter helmet gunsight, which required two bends (offsets) that didn't distort the tubing, so this subject has been of interest to me.

H

Re: 1" U in 1/4" copper tube

Posted: Wed Jul 11, 2018 4:11 pm
by LivingLegend
DianneB wrote:
Wed Jul 11, 2018 9:25 am
LivingLegend wrote:
Wed Jul 11, 2018 6:02 am
....They also freeze the ice to around -60 or -70 degree range.....
I don't have dry ice in stock either and don't know how else you could get -60 or -70!!
Table salt is more finely grained than most sand.... Try sealing one end of the tube then fill it FULL of table salt instead of sand. Pack the salt tightly and then seal the other end of the tube. You'll want as little internal void (like none) in the tube as possible once it's sealed.

LL

Re: 1" U in 1/4" copper tube

Posted: Wed Jul 11, 2018 4:38 pm
by LivingLegend
Fender wrote:
Wed Jul 11, 2018 10:43 am
Depending on the degree of bending, one might need to anneal the tube, fill with solution, freeze, bend, rinse, repeat....😀
Nope. Regardless of what they use as a filler in the tubing of the instrument.... Cerrobend, pitch, or ice, they do the bend in one move.... Even complex compound curves.

LL

Re: 1" U in 1/4" copper tube

Posted: Wed Jul 11, 2018 8:05 pm
by John Hasler
Harold_V wrote:
Wed Jul 11, 2018 1:46 am
LivingLegend wrote:
Tue Jul 10, 2018 8:07 pm
They pour the soapy water into the tubing, freeze the tube, and then bend the tube around a form to the radius/curve/shape desired.
Any idea what function is performed by the addition of soap?

H
I think that the soap will cause the solution to gell rather than crystallizing as pure water would.

Re: 1" U in 1/4" copper tube

Posted: Thu Jul 12, 2018 7:44 am
by gwrdriver
Here you go . . . https://www.google.com/search?q=making+ ... #kpvalbx=1
The pertinent part begins at 3:18.

Re: 1" U in 1/4" copper tube

Posted: Thu Jul 12, 2018 8:45 am
by Fred_V
I've seen a video of trumpet making using pitch too.

Re: 1" U in 1/4" copper tube

Posted: Thu Jul 12, 2018 9:18 am
by SteveM
LivingLegend wrote:
Wed Jul 11, 2018 4:11 pm
Table salt is more finely grained than most sand
Popcorn salt is even finer grain.

Steve

Re: 1" U in 1/4" copper tube

Posted: Thu Jul 12, 2018 11:10 am
by Builder01
Fred_V wrote:
Thu Jul 12, 2018 8:45 am
I've seen a video of trumpet making using pitch too.
Pitch is so they get the notes correct!

David

Re: 1" U in 1/4" copper tube

Posted: Thu Jul 12, 2018 11:12 am
by BAdams
:wink: That's a "sharp" comment that could fall "flat". :D

Re: 1" U in 1/4" copper tube

Posted: Thu Jul 12, 2018 4:00 pm
by Harold_V
gwrdriver wrote:
Thu Jul 12, 2018 7:44 am
Here you go . . . https://www.google.com/search?q=making+ ... #kpvalbx=1
The pertinent part begins at 3:18.
Thanks for that. It's something I'd never seen, and answered a lot of questions.

H