From: "Marco Miglionico" 
To: "ATM Archives" 
Reply-To: "Marco Miglionico" 


Hello all.

I'm working on a design for a new scope. (12.5in Dob). For the secondary cage
I am going to use the standard  2-ring cage. However, instead of 9mm ply
for the rings, I want to use sandwich construction with aluminium faces
(0.7mm) and poly(somethingniceandlight) core all bonded together. The
problem I am going to have though is how do I cut a 16in OD 14in ID ring(s)
from 0.7mm thick sheet aluminium?

The only thing I can think of,  is to jig-saw it out between thin layers of wood
while turning the piece on a bolt, which isn't ideal because the blade
never seems to want to stay vertical and perpendicular to the surface.

Any better ideas?

Thanks.

Marco Miglionico.

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