Millennium Goals What are the 8 Millennium Goals? How were they developed?
Millennium Telescope Meeting 2 Requirements and Design Goals.
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Transcript of Millennium Telescope Meeting 2 Requirements and Design Goals.
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
The mirror spec is fixed; the cell must be designed to support the 'thin' 19" mirror without significantly degrading optical performance.
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.
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.
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.
Open Structure
Avoids fans and promotes rapid cooling of the primary. Less prone to wind vibration. Minimises weight.
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?
Stiffness
Minimise flexure with rigid structures.
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.
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.
Optical System
Mechanical assembly must be repeatable such that telescope is approximately pre-aligned.
Telescope must be capable of easy remote-site fine-alignment.
Baffling
Upper cage and primary mirror baffles need to be de-mountable and easily installed.
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.
Economy of Materials
Minimise costs by keeping material weight down.
Use plywood + steel where possible and standard components if available.
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.
FAS Website Trawl...
John Cross, Bristol AS14” F/4.5 Dobsonian
Jim Brace, Wadhurst AS18” F/5 Dobsonian
Gary Poyner, Heart of Eng AS18” F/4.4 Dobsonian
Wadhurst AS, Norfolk
Other Designs…Alternative materials
Gary Wolanski, USA16” F/5 Dobsonian, 40 Pound, all-metal construction
Gary Wolanski, USA16” F/5 Dobsonian, 40 Pound, all-metal construction
Gary Wolanski, USA16” F/5 Dobsonian, 40 Pound, all-metal construction
Charlie Wicks, USA20” F/4.5 Dobsonian - all-metal construction
Jaques Civetta, France465mm Dobsonian, fibreglass construction
Doug Tanaka, USA12.5” F/6 String-Truss Dobsonian
Michael Koch, Germany8” F/4 “Folding Ruler” Airline Travel Scope