By Stephen F Tonkin
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Extra info for Amateur telescope making
I squeezed silicone glue into the holes, and used pennies as spacers, and with a vice levelling the plywood, I lowered the diagonal, back side down, onto the silicone blobs. After a 24-hour curing period, I completed the installation of the diagonal and twovane spider assembly. 5 in (38 mm) aluminium angle to the focuser board on opposite sides to allow attachment of the two-vane spider assembly. 5 in (38 mm) wide strip to shape. Strips of wood clamped to the strip facilitated controlled and defined bending.
Thinner tubing would suffice and without much doubt eliminate the need for counterbalancing. Rather than two knobs, one knob per lower spar tube is likely to be sufficient to firmly lock each tube into the mirror box. All things considered, the project is a success. 00. 00 could have been saved from the project. In addition to owning a real-time window to the deep sky, the project generated a feeling of accomplishment. There is also a sense of satisfaction from using simple tools and economical materials to make an instrument capable of viewing reaches of the universe as they appeared millions of years ago.
If it is, you'll want to take care of this, since a substantial amount of light originating from this location can reach the focal plane. A ring of cardboard painted matt-black will usually take care of this. Keep in mind, that you don't want to simply cap the end of the tube, since some ventilation is necessary to allow the primary mirror to cool down to the ambient air temperature for optimum performance. Finally, the most common and serious baffling problem results from stray light reaching the focal plane from over the top of the tube opposite the focuser.
Amateur telescope making by Stephen F Tonkin