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The 1.3m telpe mirror blank has been completed by Peter Wangsness and is now at JP Astrocraft in Charleston, … 1.3-m Mirror Grinding Machine … Mirror-O-Matic – Dr. Debug Grinding your own telpe mirror seemed like a cool idea until I did more research and discovered all the physical …

The mirror ended up with a very smooth, zone free, nearly spherical figure ready for final figuring. Figure 1: Polishing pads applied to a 9 inch grinding tool. Another local ATM has also tried the polishing pads with abrasive and CeO. His own 17.5" mirror took about nine hours to polish out completely.

clockwise, and the tool 30 degrees counterclockwise. Make 7 more strokes, rotate the mirror 60 degrees clockwise, and the tool 20 degrees clockwise. Don't think in degrees, nor numbers, just spin it randomly. Rough grit breaks up quite fast,

Mirror Grinding Kits. hand grinding a telpe mirror, this is how you make a telpe mirror out of a hunk of glass: use a sand mixture and another piece of glass to grind away the middle of a concave shape. repeat with finer and finer grit sand. dave barosso demonstrates the technique, but to do it yourself, try to visit one of the telpe makers …

12 inch f4.9 Telpe Mirror Part 3. 16:50. The 12 mirror is taken through the rest of fine grinding, going through 12-micron, 9-micron and 5-micron stages. Gordon shows how to do maintenance on the ceramic tile/dental plaster grinding tool. He demonstrates methods for deepening the mirror faster.

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.

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 Polishing And Figuring Tool ".

Grinding 500 grit on a 25" f/3.0 meniscus mirror. Tool is a 19" glass tiled stone tool with about a 3" overhang and about 37 pounds of weight.

· Alibaba offers 5,413 mirror grinding machine products. About 14% of these are metal polishing machine, 5% are bearing balls, and 4% are glass processing machinery. A wide variety of mirror grinding machine options are available to you, There are 5,413 mirror grinding machine suppliers, mainly located in Asia.

We recommend Pyrex over plate glass simply because it is much easier to build your first mirror with pyrex. The low coefficient of expansion of Pyrex makes a difference during the grinding process. Plate Glass, particularly thin blanks, can be warped by the warmth of your hand, expandings the glass into the tool, and grinds unevenly.

Save money and time by purchasing a telpe mirror kit. This kit includes a 6 inch telpe mirror blank, all the silicon carbide grits, white aluminum oxide powders, gugolz pitch, and cerium oxide polish you will need to grind and polish a 6 inch telpe mirror all bundled in one spot. This will get you on a great start to building your own telpe.

What about grinding the curve - isn't that difficult? Actually, rough grinding the curve is probably the easiest part of the job. Fine grinding without leaving larger pits behind is a little harder. Polishing it out completely is a little harder yet. Figuring is by far the most difficult part of the job, maybe by an order of magnitude.

The first phase of rough grinding my 8.5 inch Pyrex disc into a telpe mirror. Including beveling the edges, measuring sagita (central depth), and grindin...

Too sharp of mirror edge, resulting in glass flakes breaking off and getting caught between tool and mirror. Tool warping. Scratches are hard to come by with 220 silicon carbide grit; they are very easy with the finer 9 micron aluminum oxide. Fine grinding is done with tool on top (TOT).

George Willis Ritchey built this mirror grinding machine at the Yerkes Observatory in Williams Bay, Wisconsin, in the late 1890s. Under the sponsorship of George Ellery Hale, the machine was used to grind a series of telpe mirrors starting with a 24-inch and then a 60-inch mirror for a telpe initially intended for the Yerkes Observatory.

Want to build your own telpe? Start with one of our telpe mirror kits. Each kit comes with a telpe mirror blank and all the abrasives (silicon carbide grits and white aluminum oxide powders), cerium oxide polish and pitch to grind and polish it to your specifications. Please note that our kits do not include a grinding tool or pitch ...

Save money and time by purchasing a telpe mirror kit. This kit includes an 10 inch telpe mirror blank, all the silicon carbide grits, white aluminum oxide powders, gugolz pitch, and cerium oxide polish you will need to grind and polish an 10 inch telpe mirror all bundled in one spot. This will get you on a great start to building your own telpe.

Grinding own mirror gives you a spherical or a parabolic curve… · 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.

The grinding tool consists of a glass disk somewhat smaller than the mirror blank (I used a 19-inch diameter tool for the 22-inch blank; see Plate VII, b, top). On this disk a wooden disk about 1 inch thick and 2 inches smaller (17 inches) than the glass tool is cemented to the glass disk with burgundy pitch.

You can use #60 carborundum tools for grinding. Note that you should always maintain an angle on the edge of the mirror throughout grinding. In case your mirror is too light to sand enough, as is done for small size mirrors. Begin grinding concentrating by focusing the center of the mirror to the edge of the tool. However, when having a mirror ...

Please help support and donatehttps://&hosted_button_id=LYGQMGQRUW4TSI made a 8" tool for a 10" mirror with dental...

All our Mirror Kits contain a Pilkington Float Glass mirror blank and Grinding Tool. These arefinished with fine ground edges. 180 grade first stage ginding powder. 400 grade ginding powder. 303 grade smoothing powder. Top quality Cerium Oxide Polishing powder.

Grinding an 8″ F/10 Telpe Mirror. For this project (my first time ever grinding a mirror) I ordered an 8″ Black Vitrified Ceramic (BVC) blank without a pregenerated curve from ASM Products in Ste-Basile PQ. Ordering from Canada is always cheaper once you factor in all the taxes – all told the kit cost about $185.

Telpe Mirror Kits Firsthand Discovery. Start with one of our telpe mirror kits Each kit comes with a telpe mirror blank and all the abrasives (silicon carbide grits and white aluminum oxide powders), cerium oxide polish and pitch to grind and polish it to your specifications Please note that our kits do not include a grinding tool or pitch lap If you need …

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. …

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...

Grinding and polishing your own mirrors is a long, arduous process. Instead of lapping the blank by hand, Laurie Hall built this mirror grinding machine from scratch.

When grinding thin mirror blanks, be conscious of downward pressure, which if excessive, may bend the mirror blank momentarily out of shape. While this is not a problem during rough grinding (as the amount of flex is exceedingly small) the effect becomes important as you reach the later stages of making your telpe mirror.

When the wet comes to the end, stop grinding, separate the mirror and the tool, and more water and grit, then continue. If you have a tile tool, you can slop some water and grit on from the side without separating the mirror and tool, but don't drag the tool off on the edge of the mirror - this can roll off the edge.

Making a Tile Tool for Mirror Grinding 2:29. 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 the plaster, sanding, setting tiles in epoxy, and varnishing to make waterproof. For more info check out the blog post: ...

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. I used a chisel and a belt sander to put a curve on the ...

The Mirror: Grinding, Polishing, Figuring. 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.

After hogging the mirror blank to depth, the rough grinding stage begins. In this video I am grinding with 60/90 grit. The wets are lasting about 90 second...

Please see the Buy Telpe Mirror Blanks page for low prices on plate glass mirror blanks. If you'd like to buy a complete mirror grinding KIT, with all abrasives and grinding tool included, please see the Buy Telpe Mirror Kits. website for the lowest prices on plate glass telpe mirror grinding kits.