Fine grinding. A flatness in the range of 1 µm can be reached by grinding three glass blanks alternatingly against each other, blank 1 on 2, 2 on 3, 3 on 1, and so on. This will be continued with each Carbo grade. After fine grinding, one of the blanks is picked as the future flat mirror .
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Please see the Buy Telescope 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 Telescope Mirror Kits. website for the lowest prices on plate glass telescope mirror grinding .
Making A Mirror Grinding Tool. By Allen Malsburry The average person would never think, "I can make my own telescope." Most amateur astronomers believe, "I can buy a better
31 rows · Grinding the curve into the mirror face can be done by one of the following approaches: .
Tools should be in the 75 to 80 percent of mirror diameter range. Smaller tools can be used for fine grinding if they are swept across the mirror surface enough to grind the mirror center. Sweeping the tool will require larger tool overhangs to maintain the neutral position mentioned below.
Nov 01, 2011 · Basically there are two types of grinding/polishing machine. The 'traditional' type which involves the mirror rotating at a relatively slow speed, a few rpm for a big mirror (16-20 inches) with the tool moving across the mirror, from side to side, at a higher rpm depending on the size of the mirror and/or tool.
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 .
Grinding progressed reasonably well until the fine grinding, when the epoxy on a number of tiles failed and they came off of the grinding tool. Luckily, the mirror was basically undamaged by this, so I cleaned up and decided to polish the mirror and see what I had.
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The usual way to handle this is to heat the pitch in a small used coffee can and pour it onto your mirror or tool. But the Grinding Guy has other ideas, and his solution is simple and elegant. I wrap my tool with 2" wide masking tape, making a small reservoir for the pitch, which was crushed to .
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Feb 11, 2014 · Gordon Waite describes the mirror grinding tool that he used to grind a pair of 22" f/4.0 mirrors for the Binoscope project. The tool is made from dental plaster and ceramic tile.
Position your glass cutting tool on your line and place your metal ruler up against the cutting wheel. Use your glass cutter tool to score a line into the mirror that runs the entire length of the mirror (make sure to keep your tool right up against the ruler as you score).
Mar 06, 2006 · Looking back at my notes I used the tile tool primarily at the 70% zone of the mirror. The tile tool was centered at 4 3/8" out from the center of the mirror. I remember also that if you move the tool center closer to the mirror center you deepen the sagitta, if you move it farther from the center you flatten the edge.
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. During fine grinding, we'll grind the mirror face against a tool with a series of ever finer grits.
Woodware: Mirror Grinding Stand. 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 telescope maker. To grind a telescope mirror by hand you simply attach a glass tool the same size as your mirror blank to the top of a small, strong stand. Get Price
Products/Services for Telescope Mirror Grinding Machine Grinders and Grinding Machines - (990 companies) Grinders and grinding machines use an abrasive that is bonded to a wheel, belt or disc to remove material and improve surface finish.
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.
Jul 08, 2012 · Mirror grinding tile tool - posted in ATM, Optics and DIY Forum: Hi all, Im about to begin crafting a mirror grinding tool out of plaster and tile. In researching how to make the tool, Ive ran across some conflicting instructions.
Dec 30, 2017 · Making A Mirror Grinding Tool - Amateur Astronomers, Inc. build your own telescope, and almost any homemade telescope will have higher quality optics than the .
Holding the mirror: Don't let your fingers touch the bevel of your glass while rotating the mirror during grinding and polishing. When you rotate the mirror during it closer to the center of the edge. Touching the bevel heats the glass, causing to expand.
In years past, it was common to use two pieces of glass, one for the primary and one for the tool. After the concave mirror was made, the glass "tool" was scrapped. Today, because glass is expensive, we make the "tool" using less expensive materials. Here is how to make the grinding tool. 1.
Discounted Telescope Mirror Blanks, Mirror Grinding Tools, and odd-sized blanks Discounted Mirror Blanks - Big Savings! TelescopeMirrorBlanks.Com sells discounted mirror blanks which have a few more surface scratches than normal, or more than average edge chipping - these mirror blanks are perfectly usable, just a bit "aesthetically challenged" and these cosmetic flaws will in no way affect .
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.
If the tool is much smaller than the mirror blank, the fine grinding and polishing should be done with the tool on top. It is a good idea to use lukewarm water during the last wets of fine grinding, and also during polishing. Cold water may shrink the mirror face allowing us to grind or polish away the edge.
In mirror grinding and polishing we use a tool as the surface on which grinding compounds are placed. The mirror blank is moved against this surface and the compound grinds away glass to give the blank the shape and surface we want.
Alibaba offers 16,053 mirror grinding products. About 23% of these are machining, 1% are abrasive tools, and 1% are grinding machines. A wide variety of mirror grinding options are available to you, such as abrasive disc, abrasive block, and abrasive pad.
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
For that purpose I glued diamond pellets to a plaster tool and used it like a normal grinding tool on the machine. The tool should not be bigger than ½ the diameter of the mirror. I used fairly high turntable speed and lots of water for grinding.