The 1" diameter on the small end may be a problem because most slip rolls
won't go that small. Otherwise something like this should do it:

http://www.harborfreight.com/cpi/cta...temnumber=5907

You could buy a small slip roll instead of than the combination machine but
it probably wouldn't be any cheaper and I don't know if you could find one
with smaller rollers to handle the 1". Plus with the combo machine you get
a shear and that's really handy for that type of work.

Best Regards,
Keith Marshall


"The universe is full of magical things,
patiently waiting for our wits to grow sharper."
-Eden Phillpotts, A Shadow Passes, 1934
"steamer" wrote in message
...
--A friend of mine wants to build some big-ass Hero's turbines. He
wants to have the steam exiting from tapered tubes on either side of the
devices. What we need is a method to roll, or otherwise form oh, say, 18
or 20 ga. steel into tapered tubes; maybe 12" long with 1" dia on the
small end and 2 to 3" on the other end. So how is this normally done; i.e.
do we need to make a mandrel or some conic sections to drop into a custom
roll former, or what?
--TIA,

--
"Steamboat Ed" Haas : Quando Omni
Hacking the Trailing Edge! : Flunkus Moritati
http://www.nmpproducts.com/intro.htm
---Decks a-wash in a sea of words---