Dave, all:
Jamie is doing a remarkably fine job for an amateur, with the surf board,
and this is because the finished object has a shallow angle at the edge.
Raising a sheet metal object up to 30 degrees is not so difficult, but
acheiving a 90 degrees edge angle will prove impossible, without blowing the
part into a negative mold.
This is at least what this toolmaker thinks, and why he still has his
toroids made at the local metal spinning shop.
Cheers, Finn Hammer
----- Original meddelelse -----
Fra: Dave Leddon <dave@xxxxxxxxxx>
Emne: [TCML] Hydroforming Toroids
The other day I was watching an episode of Mythbusters in which Jamie
used hydroforming to fabricate a pontoon out of stainless steel.
(Sorry I could only find this in Spanish)
https://www.youtube.com/watch?v=sxcOzPzqOi8
Is there any reason that we couldn't use the same technique to create
toroids? It would seem that all one would need is three thick pieces
of steel plate, a large outer ring, a small inner disk and a large
bottom disk. A pressure washer would provide the necessary high
pressure water. What do you think?