By Stephen Tonkin
This ebook offers an advent to the layout of quite a few telescopes, mounts, and drives appropriate for the home-constructor. initiatives contain tools that diversity from a shoestring price range to expert units that aren't commercially to be had. The ability point of every undertaking is indicated and suggestion is supplied as to what's brilliant to build, given what's commercially on hand. tricks and guidance are integrated, in addition to listings of respected mail order assets of fabrics and elements.
Read Online or Download Amateur Telescope Making (The Patrick Moore Practical Astronomy Series) PDF
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Extra info for Amateur Telescope Making (The Patrick Moore Practical Astronomy Series)
00 at a local hardware store. I sealed the disc with high-quality epoxy left over from a boat project. After it was dry to the touch, I epoxied 2 in (5 cm) square ceramic tiles to the surface of the stone. 2 in (5 mm), the tiles eventually became too thin at the edges and I had to secure fresh tiles across the total surface. The cost of grinding and polishing was fairly low because I split with three other amateurs a bulk purchase of grinding and polishing materials. I polished with paper pads and then finished with pitch.
On the end of each bolt, I secured with Loctite a plywood knob and T-nut assembly. With the mirror in the sling, four pieces of broomstick prevent lateral movement. This technique was first described by David Kreige in Telescope Making no. 35. Each dowel has an off-centre hole bored end to end which allows lateral adjustment of each dowel in order to barely clear the mirror's edge. A nut and bolt secure the dowel to the tailgate. The mirror does not touch the dowels. Four mirror clips are fastened on top of each Shoestring Telescopes dowel.
Apply a final coat of the matt-black. This is best done with a sponge and a gentle dabbing motion. Once this coat has dried your tube's interior will be wonderfully dark - so much so, that any missed areas will be glaringly obvious. Once the tube interior is completed, it's time to look after the remaining baffling issues. How much remains to be done depends upon the specifics or your telescope, but there are three oftenneglected problem areas. The first of these is the miscellaneous hardware inside the tube - the shiny nuts and bolts used to mount the focuser, mirror cells, or what have you.