It seems that you're in Germany. We have a dedicated site for Germany. The Internet Age is changing everything about human invention and the use of technology. The change has been compared to that of the introduction of printing. The old days of grinding and polishing are gone — unless you want to do it!
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Amateur telescope making - Wikipedia
So it is sobering to recall that seven decades ago many amateur astronomers had to grind their own mirror or lens and construct the telescope tube and mounting with their own hands. Amateurs active during the early 20th century not only required an intense interest in astronomy, they also needed the self motivation, persistence and unique mechanical skills necessary to build their own astronomical instrument. Out of their collective but solitary craft emerged the robust and colorful tradition of amateur telescope making. The origins of this tradition are probably lost forever, due to the improvisational design of amateur instruments and the repurposed materials used to make them. But as professional telescope makers became more common, amateur telescope makers grew numerous as well. Workers with one of Parsons's 72" speculum mirrors.
Amateur Telescope Making
Victor Rogus contributed this article to Space. One of my greatest joys in amateur astronomy has been in building my own equipment. The great Clyde Tombaugh originally inspired me to do this — a Kansas farmer's son, Tombaugh's plans for attending college were frustrated when a hailstorm ruined his family's crops.
For anyone who has ever dreamed of exploring the heavens with a telescope, Build Your Own Telescope can make that dream come true. In clear, step-by-step instructions, author Richard Berry tells how to build five telescopes, from a simple reflecting telescope suitable for a parent and child to build together to a "research-grade" inch telescope capable of sustaining a lifetime's interest in astronomy. Detailed instructions include complete plans and photographs that show how anyone can construct a powerful telescope with ordinary household tools and materials. Build Your Own Telescope includes complete plans, step-by-step instructions and illustrations that show you how to build these five telescopes:.