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Mirror Grinding at the Spring 1998 Stellafane Mirror Workshop in the McGregor Observatory Rough Grinding. The purpose of rough grinding is to start to cut a spherical concave surface into the mirror blank. For a 6" mirror with a 48" focal length, the depth of the curve is 0.047". A full sized tool is rubbed against the mirror blank, with a wet ...
Make a polishing tool from plaster like we did for fine grinding of at least 1/2 the mirror diameter. Let it dry thoroughly, and seal with water sealer or something similar. By using a tool of this size, we avoid astigmatism, and produce a zone free surface, absent of roughness so typical of small tools.
You'll need to do a number of wets to get through rough grinding. What we are doing here is simply shaping the mirror to the desired sagitta, then the rest of the work will be progressively making the surface of the mirror smoother and smoother. The video shows about 30 minutes of this process on another mirror that I'm making for my nephew.
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.
Mirror Grinding Machine. The true test of the amateur astronomer is building their own telpe. Grinding and polishing your own mirrors is a long, arduous process. Instead of lapping the blank ...
In this video I am showing you how to make a DIY telpe mirror! This is the second part in the series, showing fine grinding in a step by step tutorial.
1. Clean: Make sure your plaster disk is clean and dry.If you are using a glass substrate or tile tool, clean the surface with turpentine. 2. Build a Dam: Using 2" wide masking tape, build a dam at least 3/4" high around the edge of the disk to hold the pitch in when you pour it. …
In regular visits through the winter I began the grinding, polishing, and figuring the mirror blank to astronomical standards. After forty-five hours of my "pushing glass," the experts declared the mirror finished once it reached 1/6 wavelength through Foucault testing. I sent the mirror …
Introduction. The mirror machine came to me as a result of astronomical horse-trading, swapping a large GEM mount and a 8" Newtonian OTA for the machine as it was and a start kit consisting of two 6" blanks and the grit, rouge and pitch to manufacture a mirror. The grinding machine had been built to the design of the mirror-o-matic design of ...
Types of mirror grinding machines - posted in ATM, Optics and DIY Forum: Hi to all, I am planning to make a mirror grinding and polishing machine but i have limited knowledge about these machines. Because of this i have some questions to someone who has some experience with those machines; - Some machines have fixed supportes and some of them have a prestaltic moving arm, …
My Mirror Grinding Machine. For a long time I've wanted to build a machine for grinding telpe mirrors. Dennis Rech's M-o-M designs finally inspired me to just get up and do it. Over the years, I'd been collecting motors, gear boxes, pulleys, etc. Most of them came from industrial junk yards.
The goals of fine grinding are to prepare the curved mirror face so that it is ready for polishing and figuring and make any adjustments of the focal length. Previously in rough grinding we deepened the center of the mirror's face either by grinding with coarse grit and a tool, slumping in a kiln over a mold, or purchasing the glass pre-generated.
Gordon Waite sets up his fixed-post mirror grinding machine to begin rough grinding on an 11 f/4.3 telpe mirror. He uses a grinding tool made from dental plaster and steel pieces to speed up grinding. Gordon shows the setup for spin grinding at high speeds and with added weights to get the job done as fast as possible.
Mirror grinding is a noisy, messy, wet activity. It doesn't take up enough of your attention to fully occupy you, but it does take up just enough that you cannot do something else like watch TV, listen to the radio, etc. You're pretty much stuck there looking at your hands, and adding water or grit once in a while. ...
Fixed-post machine grinding is where the mirror is on a turntable rotating around 20 PRM [speeds vary], and a 75% tool is on top. They are already curve-generated. The tool is hanging over the mirror by 1/6 the diameter of the tool, or about 1/8 diameter of the mirror, and is fixed in this position.
After fine grinding is complete, the mirror must be polished. It is during polishing that you "figure" the mirror by using a different polishing stroke to change the mirror's spherical polished shape into a parabolic polished shape . See a related tutorial nearby titled, " Making A Mirror …
Grinding is the first step to make the mirror. You remove glass from Mirror blank and hollow it to a concave shape. Once you have the grinding post set, you can start grinding the mirror using the following options. Use the tool to rub the mirror over it by using various kinds of strokes ;
(4) we removed the tile tool from the mold and ground the topside (non-tiled side) by sliding it (topside down) on the sidewalk outside the community center. The result is a grinding tool of the same diameter as the mirror: the tiled side has the same curve as the mirror, and the topside is …
All About Telpes How To Build * How To Use * Mirror Grinding * Photography|Sam Brown, Sicilian Shadows|Franc Scannella, Bibel Und Natur Vorlesungen Ber Die Mosaische Urgeschichte Und Ihr Verhltniss Zu Den Ergebnissen Der Naturforschung [FACSIMILE]|F. H. (Franz Heinrich), 1825-1900 Reusch, Fanny Burney: Madame D'arblay (Classic Reprint)|Austin Dobson
For grinding the back of my 12" mirror, I used an 8" disk of 3/4" particle board, glued tiles to the front with epoxy, and coated the back and sides with polyurethane. It worked great. I made my polishing tool for my 12" mirror out of three layers of 3/4" particle board glued together.
Page 1 of 2 - Making my own fixed post mirror grinding/polishing machine - posted in ATM, Optics and DIY Forum: Hey guys. Im thinking of making my own fixed post mirror grinding/polishing and curve generating machine. Ive got loads of questions regarding the design so Ill just start firing away Do I need an eccentric moving tool to be able to polish a mirror spherical?
Now days it is easer to buy finished mirrors than grinding kits to make them. Still grinding your own mirror is a key skill that makes you a real telpe maker. To grind a telpe mirror by hand you simply attach a glass tool the same size as your mirror blank to the top of a small, strong stand. You apply grinding compounds to the tool and ...
Rough grinding. This step is about making one side of the glass concave. It will give your mirror its overall focal ratio. If you make the centre deep, you will end up with a fast telpe (e.g. F/D = 4) well suited for deep sky observations. On the opposite, a shallow mirror (e.g. F/D = 8) will be performing very well on planets and the moon.
Grinding my first 6" f/8 Telpe Mirror This video shows a few initial stages of making a primary mirror for a 6" f/8 telpe. I'm a newbie so bear with me in my ignorance as a first timer making...
You should provide your own materials including mirror, mirror tool and pitch lap, abrasives, etc. We will have some instruction sessions, about an hour or more each day on: Set up & rough grinding: includes Getting set up/overview, Making the Tile Tool, Rough grinding; Fine grinding: includes Fine grinding, Measuring Sagitta; Polishing ...
Welcome to my channel - in this video, we will begin to make a telpe mirror from scratch! I'll be showing you the basics of telpe mirror grinding!Her...
The machine is shown grinding a 300 mm mirror.How to build a tachometer:
The condensed process of making a tile tool that will be used to grind my 8.5 inch telpe mirror. Making a mould around the Pyrex disc, mixing and pouring...
MIRROR GRINDING MACHINE. I made my first mirror grinding and polishing machine over thirty years ago. It used the working principle of the machine illustrated at "A" Fig.3, Page 163, "Amateur Telpe Making" Book 1. A bowl which rotated was fitted to the spindle. I also …
Jun 8, 2017 - Explore Neil Aubrey's board "Telpe Mirror Making" on Pinterest. See more ideas about telpe, telpes, diy telpe.
A good starter size is the 150 mm (6") mirror. A 200mm (8") 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, "learn and practice" mirror.It is cheaper, it is softer …
Lens & Mirror Making • Best lenses and mirrors are both made by grinding the surface • Start with a mirror or lens blank • For mirrors only surface needs to be good • Typical mirror want pyrex (eg BK7) • Then need a tool blank – poorer glass & softer glass • Place mirror on top tool • Now add grinding compound (grit) between ...
* Thin plate glass mirror blanks are lighter than standard mirror blanks, which allows you more flexibility in designing your telpe tube assembly and mount. * When grinding a telpe mirror, you will find that plate glass takes less time to grind and polish than a mirror made from borosilicate glass. Please see the Buy Telpe Mirror Blanks
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