What I actually want to do is make a neck in the tube, ie make a short
part of the tube much thinner, perhaps in the lathe using some type of
round-nose pliers and lots of grease to squeeze it down, while the rest
of the tube remains the original diameter.
Any hints, etc?
-- Peter F
I am not sure that I understand - do you need a thinner wall thickness
reduced o.d.? If it is a reduced o.d. consider: the following
How long is the piece you want to neck? If it is only a few inches
long you "might'
be able to do it in a press as rifle cartridges are necked. Several
sets of dies and
lots of annealing will be needed. If that doesn't work there is always
but that isn't normal workshop kit, and I have no idea who would do it
in the UK.
On Mon, 03 Mar 2008 05:40:42 +0000, Peter Fairbrother
I've not tried this but would a pipe cutter with the blade and rollers
replaced with something more suitable do?
Also casting my mind back to that video of that fellow who made his
own valves. He seemed to use a device to neck the glass that rotated
one end of the tube and rotated the other end slightly slower.
Obviously some serious heating would have to be applied in your case,
but former could be used to get a good finish.
Adolphe Sax? It's not as OT as you think.
Ferrees Tools comes instantly to mind!
My wife plays contra bass clarinet, contra alto clarinet and bass
As Morecombe and Wise put it 'Not necessarily all at the same time'
It's only lateral thinking! And I know a world authority on steam
engine loco gears who mends the things.
'And one man in his time plays many parts'
King John and Henry IV Part one ?
You can't tell me that 'model engineering' is your only forte?
'A poor life this if full of care,
we have to no time to stand and stare'
The original question was 'how to thin tubbing' or 'swage it out'.
It was a situation which has been developed over the centuries- and I
had sufficient knowledge to be able to pinpoint where the sellers of
the best repair equipment was situated.
Everyone else- went off a tangent.
Use the information or don't- Sans Feree anne to me.
A possibility if you have a solid bar would be to use EDM as a two part
operation. A simple die sinker ought to work, with one shape turned to
the external and the other to the internal. (I did something similar on
steel, just to see if it would work, using a local college machine)
You might want to drill a hole previously so that you can improve the
flow of dielectric to the internal shape.
Machining the electrode (graphite / aluminium / copper) should be a lot
less difficult than machining the Inconel!
You could try heating and pulling whilst rotating. Thats how glass
tube can be necked down iirc.
If you've ever made detailed models think of streching sprue for raido
Of course you'll ned to get it really *quite hot* for inconel.
Polytechforum.com is a website by engineers for engineers. It is not affiliated with any of manufacturers or vendors discussed here.
All logos and trade names are the property of their respective owners.