Telpe making. Mirror grinding techniques There are many reasons for grinding your own mirror. Either you want a unusual size, or focal length, or to satisfy your curiosity, or to have the "pride of achievement" by fabricating something as precise as a telpe …
After the rough grinding is done, the mirror was finely grinded using a special machine using different sizes of abrasive. Grinding from number 70 to number 1000 took about 6 hours on the machine. When grinding with the finer abrasives, the way we …
Rough Grinding. Unless the mirror comes pre-generated, the initial curve will have to be ground into the mirror. A ring tool of half the diameter of the mirror used on top of the mirror's flat face with the coarsest grit will rapidly grind a spherical curve into the mirror. Grinding a 6 …
I know it's practical to hand grind a convex spherical mirror and that it's practical to make a concave parabolic mirror from a spherical one. But as I understand …
Share. Posted August 24, 2012. The natural mirror grinding process will create a sphere. The first part of making a mirror is to grind and polish to a sphere of the required focal length. Then the mirror is parabolised, by using special polishing strokes, that changes the figure from sphere to paraboloid.
Grinding own mirror gives you a spherical or a parabolic. Aug 27, 2012 The natural mirror grinding process will create a sphere. The first part of making a mirror is to grind and polish to a sphere of the required focal length. Then the mirror is parabolised, by using special polishing strokes, that changes the figure from sphere to paraboloid.
A mirror mount is needed to hold the mirror during testing. If the mirror is a 'thin' mirror (i.e. the thickness is much less than 1/8th 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 full-thickness mirror, which is a mirror whose thickness is 1/8th the diameter or more, so mirror deformation ...
Draper Mirror Grinding Machine. Mirror grinding paraboloidmirror grinding popular Machine For Grinding Telpe Specula mirror grinding paraboloidmirror grinding popularMachine For Grinding Telpe Specula W Forgan The simple addition to an ordinary lathe for the purpose of grinding telpe specula has been of so much. View More
With the Mirror on top, the tool on the bottom, and coarse grit in between, we start grinding with the mirror overhanging the tool. We rub the center of mirror against the edge of the tool, and this wears a depression in the center of the mirror (the edge of the tool wears down also, so that the tool becomes convex (a "hill" in the center) and ...
Lengthening and widening the stroking using mirror on top is arguably the most popular technique for mirrors up to 12 inches [30cm] in diameter. It's well described in popular telpe making books. For larger and faster mirrors, this approach has …
Mirror Grinding Popular - stsg.ch. mirror grinding paraboloidmirror grinding popular. There are many reasons for grinding your own mirror Either you want a unusual size or focal length or to satisfy your curiosity or to have the pride of achievement by fabricating something as precise as a telpe mirror .
Grind and Polish a Dobsonian/Newtonian Telpe Mirror With Hand Tools: Author's note: This Instructable was written and published by our Making and Tinkering Programs Manager, who's personal Instructable account we co-opted. He is now publishing …
I know it's practical to hand grind a convex spherical mirror and that it's practical to make a concave parabolic mirror from a spherical one. But as I understand it, the procedure for doing so depend on tracking progress by using interference patters …
(grinding lap on back plate) After the back plate has been processed the mirror is moved, via the air cart, back to the Casting Lab where a giant steel ring is employed to turn the mirror over so the face plate is facing up. The movement of the mirror back to …
Rough Grinding The first milestone is putting a curve into the mirror face. The curve's depth dictates the mirror's focal length. The curve should be spherical. Creating the curve can be done by several methods: The curve is ground into the mirror face …
A ring tool of half the diameter of the mirror used on top of the mirror's flat face with the coarsest grit will rapidly grind a spherical curve into the mirror. Grinding a 6 inch [15cm] mirror to F/2.8 using a ring tool. Mirror Making Zen. Do one thing at a time. Mirror making is a process: 1. Get blank, grit, pitch 2.
Photo #2 shows the mirror at the end of rough grinding. I was aiming for an f/4.5 mirror, so the required depth of the curve is 0.175 inch. Once the required depth is reached, the rough grinding is complete. Amazingly, the rough grinding has removed over a pound of glass. The mirror now weighs in at only only 8 pounds 15 ounces.
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Products/Services for Parabolic Mirror Grinding Machines. Grinders and Grinding Machines - (985 companies) Grinders and grinding machines use an abrasive that is bonded to a wheel, belt or disc to remove material and improve surface finish. Devices can be pneumatically driven or powered by a combustion engine or electric motor.
The center of the mirror is the most likely to be contacted by any motion, so it is abraded more frequently and becomes the deepest point, while the edges are worn less. The distribution between "less" and "more" is spherical. I can at least understand the process of grinding or lapping a surface flat.
Newtonian mirror is actually applied to the front face of the glass, not the back. The light collected by the Newtonian primary mirror does not pass through any glass until it reaches the eyepiece. It simply reflects off the curved concave mirror face which focuses all the light collected to a point known as the "focal point" of the mirror.
Mirror Grinding Source Istanbul Bilder. The natural mirror grinding process will create a sphere.The first part of making a mirror is to grind and polish to a sphere of the required focal length.Then the mirror is parabolised, by using special polishing strokes, that changes the figure from sphere to paraboloid.
LBT #1 Polishing. 02010702_d4.jpg. The 8.4 meter mirror blank was then moved into the polishing lab in the nadir-pointing position. Grinding (generating) and polishing of the flat back surface of the blank began in January 1999 and was …
Mirror grinding techniques There are many reasons for grinding your own mirror. Either you want a unusual size, or focal length, or to satisfy your curiosity, or to have the "pride of achievement" by fabricating something as precise as a telpe mirror. 300 mm Dobsonian This is my main telpe.
mirror grinding paraboloidmirror grinding popular. Mirror Grinding Machine - ATM, Optics and DIY · Mirror Grinding Machine - posted in ATM, Optics and DIY Forum: I have some interest in building a grinding machine for possible up to an 18 mirror, but something that will also do a 6 or 8 mirror. I have ...
Grinding the back flat is just the first step in preventing astigmatism. The next step is the proper mirror support. Fine grind and polish the mirror face up. A thin mirror bends over the edge of the tool if it's worked on top, so the problem reduces to supporting the mirror from its underside.
Page 1 of 2 - Making a tin mirror. Grinding without tool. - posted in ATM, Optics and DIY Forum: Im making a tin parabolic mirror which is 8 inches. Telpes used to be made of mostly copper and some tin but i wanted to see what would happen with just tin. I have no tool to grind it so i was wondering if it would be possible to grind without a tool into a hopefully almost perfect parabolic ...
Telpe Mirror Grinding Machine. Grinding machine karl size telpe - klimaatwebsitebe grinding machine for large telpe mirrors i designed and built a grinding machine for mirrors up to 42 inches 11m in diameter by slipping on and off a couple of belts the machine can quickly be reconfigured for spinning work or for stroking work grinding machine karl size telpe -.
US1171174A US86695214A US1914866952A US1171174A US 1171174 A US1171174 A US 1171174A US 86695214 A US86695214 A US 86695214A US 1914866952 A US1914866952 A US 1914866952A US 1171174 A US1171174 A US 1171174A Authority US United States Prior art keywords shaft tool slide parabolic axis Prior art date Legal status (The legal status is an assumption and is not a …
