1. You, too, can avoid astronomical costs by watching stars through a tricked-out cardboard tube. Answer. OF TUBE: INSIDE DIA. The tube has been leveled and is sitting on 4 concrete blocks. OF TUBE: WALL THICKNESS: LENGTH: EST. Asked by Jordan January 7, 2018. The Sonotube Concrete Form Tubes are made of lightweight material designed for pouring footings, round columns and piers. The american Sonotube is finished with wax or other coatings so that concrete does not stick to it - removing that coating is a big pain, so if you can source an uncoated tube that would make the job a lot easier. where do i gte the cardborad roll concrete form tubes? The telescope pier will eventually bolt up to the threaded rod. A few bags of concrete, a little rebar and a sonotube will do the job. 25 September 2005: a view of the 12" sonotube sitting in the pier hole. PM builds one and speaks to John Dobson, the man behind the plans, about the joys of … MIRROR DIAMETERSIZE: OUTSIDE DIA. It is an inexpensive option that saves time and provides professional results. This assembly will be inserted into the 12" sonotube after it is filled with concrete. Richard Berry in his "Build your own telescope" book recommends using a reinforcing ring of ply at top and bottom of the tube. Telescope tubes made of hard-paper. Please call or visit your local Home Depot store for pricing. If you want to build a telescope yourself, you'll soon be on the lookout for a suitable tube. ... Hard paper is indeed "hard paper", however, has nothing to do with the "Sonotubes" made of wrapped cardboard which are used by some U.S. or chinese suplliers. SONOTUBES - TELESCOPE TUBES (APPROXIMATE SIZES) Description. 1. A view of the 3/4" threaded rod and the stud alignment plate. Shipping Dimensions: 48.50 H x 12.00 W x 12.00 D. Shipping Weight: 3.5 lbs. I know, we ATM’s usually use sonotube for telescope tubes, but this is what it is really meant to do, cast concrete. Answer. Dimensions: 4' long. 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