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Millennium Telescope Project

Millennium Telescope Project. Aperture Fever…!. Objectives. Build large aperture portable telescope Maximise light gathering ability Lightweight open tube design Transportable to deep sky locations. Obsession 20” F/5 Completed scope. Babcock 24 inch. Design Goals. Ease of construction

sheehan-kneafsey
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Millennium Telescope Project

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  1. Millennium TelescopeProject

  2. Aperture Fever…!

  3. Objectives • Build large aperture portable telescope • Maximise light gathering ability • Lightweight open tube design • Transportable to deep sky locations

  4. Obsession 20” F/5Completed scope

  5. Babcock 24 inch

  6. Design Goals • Ease of construction • Ease of assembly/disassembly • Ease of storage and transportation • Ease of collimation (repeatable)

  7. MMT Activities...

  8. Mirrors Primary Mirror (Pyrex): • Diameter, 482 mm (19”) • Edge thickness, 38 mm (1.5”) • Focal length, 2165 mm (F/4.5) • Calculated weight 15.6 kg (34 lb) Secondary Mirror (elliptical plate glass): • Major axis, 150 mm (5.9”) • Minor axis, 106 mm (4.2”) • Thickness, 14.5 mm (0.6”)

  9. Primary Mirror 15.39 kg (33.9lb) Mirror cell base 5.48 kg (12.1lb) Wiffletree 1.79 kg (3.9lb) Rocker bearing (x2) 3.62kg (8.0lb) Al bearing runner (x2) 0.80 kg (1.8lb) (optional) Strut blocks (x8) 0.78kg (1.7lb) Cross bars (x2) 1.38kg (3.0lb) Base total = 28.43 kg (62.7lb) (excluding Al runners) 8 x Struts (total) 4.11kg (9.1lb) Cage ring 1.10 kg (2.4lb) Secondary mirror 0.4 kg (0.9lb) Focuser (est) 0.24kg (0.5lb) Spider (est) 1.30kg (2.9lb) Viewfinder (est) 0.45kg (1.0lb) Telescope total 36.5kg (80.5lb) Component Weights

  10. Mirror Cell

  11. Obsession 20” F/5Mirror cell assembly

  12. Babcock 24” F/4

  13. 22” F4.05 DesignSecondary cage and spider assembly with baffling

  14. Obsession 20” F/5Truss tube clamps

  15. Obsession 20” F/5Inserting mirror

  16. 16” F/3.75 String TelescopeBase

  17. 22” F4.05 DesignCutaway of bottom frame and drives

  18. 16” F/3.75 String TelescopeIn car!

  19. Extras - Other Designs • Internet a great source of information providing inspiration! • Ultra-light designs evolving from more traditional Obsession • MMT uses best features of all these designs

  20. Sayre 22 inchCAD drawings

  21. Dan Gray 16” F/3.75 Completed scope

  22. 16” F/3.75 String TelescopeDisassembled scope (fits in a hatchback!)

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

  24. Jaques Civetta, France465mm Dobsonian, fibreglass construction

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

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