From: George Anderson 
To: Marco Miglionico 
CC: ATM Archives 
Reply-To: George Anderson 


How about a router and a trammel?

George Anderson
Montreal Canada

Clear skies and good health

Marco Miglionico wrote:
>
> 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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