By Stephen Tonkin
This e-book presents an advent to the layout of quite a few telescopes, mounts, and drives appropriate for the home-constructor. tasks contain tools that variety from a shoestring price range to expert units that aren't commercially on hand. The ability point of every undertaking is indicated and suggestion is supplied as to what's brilliant to build, given what's commercially to be had. tricks and assistance 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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Additional info for Amateur Telescope Making (The Patrick Moore Practical Astronomy Series)
To the "delight" of my family, testing was accomplished in my kitchen and dining room by traditional Foucault and Ross Null techniques. 2 in (5 mm) took 20 hours of actual grinding time, not including charging with abrasive and cleaning between wets. 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.
This timber supports the end of the tube against deformation while it is drilled. With the timber clamped in a vice, I drilled through the metal and into the wood with a hole-saw and cleaned up the edge of the hole with a small file. I then used tin-snips to cut the tin to the appropriate length. To complete the preparation of the tube parts, I roughed up the internal surfaces with some abrasive paper and gave them a coating of matt-black paint. I had a focuser (see below) from another project.
I rotate the needle, like a drill, between finger and thumb and use very light pressure. I cut the foil with the pinhole into a disc slightly larger than the brass tube. It was simple to stuff it into the tube on the blunt end of a large twist-drill which just fits inside the tube. The foil is held in place by friction. I made a plug for the LED end of the tube by heating the tube with a gas torch and using the heated tube to melt a disc out of the end of a black plastic 35 mm film can. I made the holes for the LED wires with a heated panel pin.