From: root{at}mauve.demon.co.uk
To: atm{at}shore.net
Reply-To: root{at}mauve.demon.co.uk


> 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?

Scissors around the outside.
With that thin aluminium, you can use scissors for the inside too. Cut an
octagon or something out, then bending the aluminium as you go, follow the
inside line.

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