How do I make a hindle type telescope mirror grinding machine?
477571
This site gives a lot of information:\n\nhttp://home.comcast.net/~cassarole/machine.html
1105433
You could, but it would be huge overkill. The telescope's objective (lens or mirror) limits the resolution of the image in the focal plane. So you'd be using a microscope to examine (at huge magnification) that resolution-limited image. You'd see nothing but a lot of fuzz, even when in focus; and it would be dim fuzz at that, because you'd only be capturing a tiny fraction of the available light.\n\nI'd stick to standard eyepieces.
1143611
Well, first off avoid the TASCO ones 'cos they have a reputation for using cheap optics with overly powered eyepieces (according to those in the know) - I bought one myself off Ebay a couple of years ago.\nIt ain't exactly bad (apart from the wobbly stand, cheap eyepieces, hopeless spotting scope)...... more stupid but savable than bad. Couple weeks ago I finally got round to buying a better quality "Orion Explorer II 7-21mm Zoom" eyepiece, which is a good investment, but the usual New Telescope/Accessory + sky gone cloudy once it's dark enough outside to use it jinx has been occuring ever since I got the blinkin' thing!\n\nLooking @ Telescopes.com, within your budget I'd suggest...... *drum roll*....... \nthe \nCelestron - FirstScope 114 EQ Short Newtonian Reflector  @ $159 (knocked down from $377)  http://www.telescopes.com/products/Celestron_FirstScope_114_EQ_Short_Newtonian_Reflector_5936.html\nor the Meade - 114EQ-A Short Tube EQ Reflector @ $179.95 (knocked down from $249)  http://www.telescopes.com/products/Meade_114EQ-A_Short_Tube_EQ_Reflector_-_Deluxe_Mount_42684.html\n\nAnother alternative is to scour the adverts in the back of Astronomy magazines for ones people are selling off..... or of course good old Ebay\n http://photography.listings.ebay.com/Binoculars-Telescopes_Telescopes_W0QQfromZR4QQsacatZ74927QQsocmdZListingItemList\n\nFor more advice, check out:\nhttp://skyandtelescope.com/howto/scopes/
996119
Nice to see an Indian on here!! I'm an Indian too! Maharashtrian and mainly from Pune city. Yeah, you can get telescopes in India and the prices do vary dependent upon the power it has. An average telescope that can allow you to study the solar system in a glance is available at Rs. 7000. I saw one in an exhibiton, but sorry can't really specify where you can get it. Give me your mail id and if i find anyone selling it, I'll give you the whole details. why don't you make one?? that's a great idea, cause i have made one myself that is as cheap as Rs. 500!!
338178
http://inventors.about.com/od/mstartinventions/a/microscope.htm
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This sounds like a homework question?  Maybe I shouldn't give you the whole answer, so you can learn something on your own.\n\nYou are describing a Cassegrain telescope.  You can use the mirror formula to calculate the image plane for the first optic (the concave mirror) and then use that as the object plane for the second optic (the convex mirror) to get your final focal image plane.\n\nMirror Equation:  (1/So) + (1/Si) = -2/R\n\nSo = object plane (distance from object to mirror)\nSi = image plane (distance from image to mirror)\nR  = radius of curvature of mirror\n\nThe hardest part of these calculations is to use the right sign convention and to remember that the stars (initial object plane) can be treated as at infinity.
666230
You're talking about a Class 4 laser.  \n\nThis is more than you can do in a science project.  A laser like that would have high voltage and the light could easily blind you, and the components would be more expensive than you think.  The assembly and alignment is a very fussy procedure, and can't be done in a home workshop, due to the dust that's everywhere.  \n\nMaybe you could make a twyman-green interferometer, for measuring curvature of glass, but it won't be very dramatic.\n\nI figure that a motivated adult with some electronic and physics background, $50K, and a lot of time on his hands might be able to do it in a year.\n\nIf you're into optics, you can do some demonstrations with the beams from laser pointers....
58101
Simple: http://www.life.uiuc.edu/hughes/boast/sciencelessons/telescopes.htm\nAdvanced: http://www.funsci.com/fun3_en/tele/tele.htm
786026
the easy way:\n\ntread in the stem cap and align the star nut into the steerer tube. then bang it in gently. it should recess about an inch to an inch and a half in.
919533
wire wheel on the grinder
227718
to my surprise, there appear to be many sites that sell such equipment; check it out:\nhttp://www.google.com/search?client=safari&rls=en&q=vacuum+bellow+gatan+ion+mill&ie=UTF-8&oe=UTF-8
141715
http://groups.yahoo.com/group/glasscollectors/\nTry my yahoo glass group for help.
417677
For refractors, the most common problem is chromatic aberration. In this, you get little rainbows around bright objects and a blurrier image around others. This happens because the lenses act like prisms. All refractors are subject to this, but some *very* expensive ones have it less. They fix this by using more than one type of glass.\n\nFor reflectors, the main problem is spherical aberration. This is caused by the mirror not being a perfect paraboloid. It is much easier to grind a sphere than a paraboloid, and most mirrors are first ground to a spherical shape. If the subsequent grinding isn't done right, the resulting images will be blurrier than need be. For decent images, the mirror's shape has to be within 1/4 of a wavelength of light, and for a good image it should be correct to within 1/10 of a wavelength. Considering how small the wavelength of visible light is, you can see how hard that is.
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I am gessing that you want to knoe about "optical" telescope.\n\nThere are basically two types of optical telescopes.\n\n1. Refrective Telescope\n==========================\n\nThere is an objective lense that creates a virtual image of the object you are trying to see very close to asecond lense called the eaypiece. The eyepiece magnifies that virtual image many times bigger.\n\nMagnification = focal length of objective/focal lenth of eyepiece\n\n2. Mirror type (Newtonian)\n==========================\n\nThis type uses a parabolic mirror to create a virtual image of the object you are trying to see very close to the eaypiece. The eyepiece magnifies that virtual image many times bigger.\n\nMagnification = focal length of mirror/focal lenth of eyepiece
828583
We make small display rotators if you check out our web site you can get an idea how we build them. You probably just need a slower gear motor. You can change the pulleys for different speeds but then you need to change the belt size. It is always easier to get a motor close to the final speed you want.\n I don't know what the cabinet looks like or what kind of space you have for the motor but it may help to see how we build them. www.semcomotion.com
834983
Perhaps you mean "novice" as in beginner?\n\nThere are many resources out there for building a telescope. One place you might check is on www.atmsite.org\n\nThere are also many books on the matter under "Telescope Making"
126059
Magnifying mirrors are concaved inward and work by focusing the light on a point such that the image is larger than the original object.\n\nhttp://physics.bu.edu/py106/notes/Spherical.html