I am ringing around for 1 1/4" aluminium tube for the trusses for the 18" Dobsonian project. Two parts to my question:
1. Threaded inserts: Does anyone know of a local supplier for the threaded inserts described in
Kriege's book? If not, and I have to purchase from Obsession Telescopes (which I'm happy to do if necessary), will there be enough tolerance for 1.6mm tube.
2. Aliuminium Tube: All I can find so far is 1 1/4" (32mm) diameter, but 1.6mm thick. Now
Kriege's book, suggests 0.049" (1.24mm) thickness walls. My two local suppliers are
Smart Aluminium and
Williamstown Metal Merchants. I am looking for local suppliers so I can pickup, rather than delivery from interstate, and these two are on my side of Melbourne.
hoo roo,
Steve