Something i did for fun during my free time.
Please feel free to use/reference.
Technical Plans for 6" F/5 Newtonian
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Technical Plans for 6" F/5 Newtonian
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- Airconvent
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Re: Technical Plans for 6" F/5 Newtonian
Hi Chaosknight,ChaosKnight wrote:Something i did for fun during my free time.
Please feel free to use/reference.
Is this a conceptual plan or have you got a prototype made?
Do upload the pics here is there is a finished product...:-)
rich
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- weixing
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Hi,
Have a nice day.
I think most DIY people in singapore buy the mirror instead of making one. It is not practical to make your own mirror in Singapore, because I don't think there are coating service at a reasonable price available in singapore.you file the main mirror, or buy from market? I am trying to file the mirror myself, but I don't know where to get the thick glass, about 20mm thickness, and the plating service for glass
Have a nice day.
Yang Weixing
"The universe is composed mainly of hydrogen and ignorance."
"The universe is composed mainly of hydrogen and ignorance."
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Oh no.....who dug up this old thread??
Anyway i had this idea to get a parabolic mirror by mechanically performing the equivalent of a 4-pt bending on a plane mirror.
It may be easier to obtain the required shape without too much grinding. However, this doesn't avoid the need for surface grinding for a mirror finish. The mirror material cannot be glass. A suitable alternative is metal.
The mirror can then sit in an adjustable cell, and variable focal lengths from the same optical system can even be obtained.
Anyway i had this idea to get a parabolic mirror by mechanically performing the equivalent of a 4-pt bending on a plane mirror.
It may be easier to obtain the required shape without too much grinding. However, this doesn't avoid the need for surface grinding for a mirror finish. The mirror material cannot be glass. A suitable alternative is metal.
The mirror can then sit in an adjustable cell, and variable focal lengths from the same optical system can even be obtained.
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It is a good idea to DIY some stuff. But for optics I feel that it is not practical in cost. I have actually designed an achromat doublet and I have asked for quotation and it really cost a bomb; especially with such low quantity. Therefore I shelved the idea of trying to make or design the optics myself. Even if I designed an apochromat, the cost of developing (making prototypes) it and fabricating it is not reasonable.
Yes, we all had that dream of designing and building that 'Ultimate' killer telescope. However, reality sets in when you consider the additional costs of silvering and coating the mirrors. For that price, I could get a commercial scope of good quality, and without the risks involved. Unless you have your own workshop, getting a few pieces done to your specifications can be very expensive indeed!
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