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Designing the base box was a little easier. Starting with the original MoM 20 dimension, I just needed to make sure the pulleys could be lined up and have clearance for the pulleys and belts. Of course you also have to keep in mind that the powerhead is going to slide around when the pulleys and belts are changed.
Page 1 of 2 Grinding your own mirror How is it possible to get accuracy in the nm posted in ATM, Optics and DIY Forum So I have read forum questions amp answers on topics such as whether it is possible to use a 3D printer to design and print out a telescope mirror, or design an array of paraboloids this way for a segmented design, and the answers have been, no, the 3D printers dont have
I work on large very fast thin mirrors, the biggest problem in telescope design. Super fast large mirrors mean 39feet on the ground observing39 and fast imaging. The I.A.U. named asteroid 17823 Bartels discovered 1998 by J in recognition for my contributions to amateur astronomy. My sketch of Arp 80 with IFN using my 25 inch.
The center will deepen during the first stage of fine grinding as contact is achieved across the mirror face and fine grinding tool. On larger mirrors, the ring tool may leave the zones part way to the edge a little underground. For these mirrors, as you near the depth, you can alter the strokes to be offcenter.
Published on Dec 16, 2014. Gordon started with a 234 thick telescope mirror that weighed about 70 pounds. By thinning the blank, he39s lightened the mirror by about 20 pounds This video explains
The usual full thickness ratio is 16 which means normal polishing techniques can be used on this kind of mirror. Mirrors larger than 16 their thickness are considered thin mirrors and will need more thoughts put into it back of the mirror must be even and padded during polishing, used an appropriate mirror cell design, etc.
The Diamond curve generating machine in this video is grinding a 1639 mirror blank. The purpose of this machine is to generate a curve into the mirror using homemade grinding tools, a diamond saw
MirrorOMatic grinding machine. The MoM is a marvellous machine due to its simplicity and yet refined design. It is extremely flexible accommodating mirror sizes from 4 inch up to 20 inch with slight modifications and can be used for all three steps necessary in producing a mirror. That is you can use it to grind, polish and figure
Grinding Machine for Large Telescope Mirrors. I designed and built a grinding machine for mirrors up to 42 inches 1.1m in diameter. By slipping on and off a couple of belts, the machine can quickly be reconfigured for spinning work or for stroking work. The machine can also work smaller mirrors if the drip pan is moved to the fast shaft on
Grinding a Mirror 34For it is true that astronomy, from a popular standpoint, is handicapped by the inability of the average workman to own an expensive astronomical telescope. It is also true that if an amateur starts out to build a telescope just for fun he will find, before his labors are over, that he has become seriously interested in the
Mirror grinding machine construction log I started thinking about building my own mirror grinding machine several years ago. Having been on the ATM list now since almost the beginning of it here on the web, I had lots of of inspiration reading of others projects and viewing their webpages
A mirror mount is needed to hold the mirror during testing. If the mirror is a 39thin39 mirror i.e. the thickness is much less than 18th its diameter then the mount must hold the mirror without deforming it. The weight of the glass can deform a thin mirror. In my case, I was making a fullthickness mirror, which is a mirror whose thickness is 18th the diameter or more, so mirror deformation
A good starter size is the 150 mm 634 mirror. A 200mm 834 will also work. Most ATM books and websites recommend a Pyrex mirror blank, but in my opinion, annealed plate glass is better for this first, 34learn and practice34 is cheaper, it is softer and grinds faster, needing less abrasives and with these small sizes, the low expansion glass like Pyrex has no practical visible at
Casting a Large, LightWeight Telescope Mirror From Recycled Glass The first photo below shows a 12.5 inch diameter, 1.5 inch thick, telescope mirror blank, made from recycled glass, that has been lightened by casting the mirror in a mold that made lots of hexagonshaped pockets in the back of the mirror. This is
Thin plate glass mirror blanks are lighter than standard mirror blanks, which allows you more flexibility in designing your telescope tube assembly and mount. When grinding a telescope mirror, you will find that plate glass takes less time to grind and polish than a mirror made from borosilicate glass.
Don39t confuse lower case r mirror radius with upper case R Radius of Curvature which is twice F Focal Length. Calculating Sagitta. Before you start grinding, you should have decided on your mirror39s desired focal length. The two most common beginners39 mirrors, the 634 f8 and 834 f6, both have 4834 focal lengths.
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