Re: [ATM] Cutting the sonotube for a dobsonian

["Nils Olof Carlin" <nilsolof.carlin@telia.com>]

One variety that I fancy is using thin plywood to make a square 
cross-section tube. The flat sides resist movement well - I make a "diagonal 
cage", a square frame to fasten the trunnions to, and a square mirror cell.

This is light and fairly easy to use - and the material can be 1/8" or 
thinner (since this is essentially a "closed" box - the rocker box needs vey 
much sturdier material since it isn't - but a light OTA helps).
http://web.telia.com/~u41105032/33217b04.jpg
This would be useful for any size where a sonotube might be contemplated - 
i.e. up to some 10".

Nils Olof 


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