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Millennium Telescope

Millennium Telescope. Meeting 2 Requirements and Design Goals. Requirements. Portability. The telescope unlikely to be used in dome or on balcony- so must be portable. This also implies it must be de-mountable and easily assembled. Mirror.

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Millennium Telescope

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  1. Millennium Telescope Meeting 2 Requirements and Design Goals

  2. Requirements...

  3. Portability • The telescope unlikely to be used in dome or on balcony- so must be portable. This also implies it must be de-mountable and easily assembled.

  4. Mirror • The mirror spec is fixed; the cell must be designed to support the 'thin' 19" mirror without significantly degrading optical performance.

  5. Height • Primarily fixed by mirror focal length and diameter- otherwise the lower the better, minimises the climb up a ladder. Will be approx 7 feet.

  6. Footprint • The disassembled telescope should fit into a hatchback- e.g. Golf or Focus. • Must be easily stored at OASI e.g. in storage area at bottom of dome steps.

  7. Weight • All de-mounted components should be capable of unaided lifting and manoeuvring by two (unexceptional) persons; imposes an upper limit of about 60 pounds per component.

  8. Open Structure • Avoids fans and promotes rapid cooling of the primary. Less prone to wind vibration. Minimises weight.

  9. Struts/Truss-Tubes • Short enough to fit into a hatchback; look into multi-section struts; struts cannot exceed a certain length (subject to design). • Can we use 6 struts rather than 8; this simplifies telescope balance and reduces weight?

  10. Stiffness • Minimise flexure with rigid structures.

  11. Rocker/Mirror Box • Rocker may be more elegant, simpler to make and achieve weight targets - but design is more speculative. • Mirror box is proven design but much heavier- and may not meet design requirements.

  12. Secondary Cage • Keep as light as possible- consistent with mechanical rigidity. • Design should consider (optically) best available eyepieces- probably 2". • Secondary mirror pre-alignment should be designed-in. • Design needs to be safe for transportation.

  13. Optical System • Mechanical assembly must be repeatable such that telescope is approximately pre-aligned. • Telescope must be capable of easy remote-site fine-alignment.

  14. Baffling • Upper cage and primary mirror baffles need to be de-mountable and easily installed.

  15. Drive System • Although initially envisioned to be manually tracking, it would be highly desirable to be capable of upgrading to automatic tracking, at a later date.

  16. Economy of Materials • Minimise costs by keeping material weight down. • Use plywood + steel where possible and standard components if available.

  17. Economy of Machining • Design as many non-standard components as possible that can be produced "in-house". Consider use of plywood, for rocker or mirror box, etc; and Martin's metal working expertise for other components.

  18. FAS Website Trawl...

  19. John Cross, Bristol AS14” F/4.5 Dobsonian

  20. Jim Brace, Wadhurst AS18” F/5 Dobsonian

  21. Gary Poyner, Heart of Eng AS18” F/4.4 Dobsonian

  22. Wadhurst AS, Norfolk

  23. Other Designs…Alternative materials

  24. Gary Wolanski, USA16” F/5 Dobsonian, 40 Pound, all-metal construction

  25. Gary Wolanski, USA16” F/5 Dobsonian, 40 Pound, all-metal construction

  26. Gary Wolanski, USA16” F/5 Dobsonian, 40 Pound, all-metal construction

  27. Charlie Wicks, USA20” F/4.5 Dobsonian - all-metal construction

  28. Jaques Civetta, France465mm Dobsonian, fibreglass construction

  29. Doug Tanaka, USA12.5” F/6 String-Truss Dobsonian

  30. Michael Koch, Germany8” F/4 “Folding Ruler” Airline Travel Scope

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