mirror grinding tool
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
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 ... (grit) between tool & mirror • Grinding – moving the mirror over the tool with grit between) • Grinding compound will make tool convex, mirror concave . Grinding ...
Fast Mirror Grinding and Polishing Miscellaneous Tips and Techniques . John D. Upton November 15, 2001 (Updated July 15, 2002) ... As the mirror and tool were slowly pulverized by the grinding process, the iron in the resulting grinding "mud" instantly oxidized. This rust colored mud stained almost everything it came into contact with.
The machine was used for making numerous mirrors over the next four decades and extensively modified over that period. It embodies the "sub-diameter tool" design approach to making large telescope mirrors whereby the grinding tool is drawn across the mirror blank by programmable rotating arms.
Much is also unchanged - mirror grinding techniques are very similar to those written up by Porter and Ingalls in the 20´s and 30´s. Many amateur astronomers still choose to fabricate their own instruments, for the pride of accomplishment, the gaining of knowledge and the insurance of quality.
Make your own telescope mirror! Each kit comes with a high quality telescope mirror blank and all the abrasives, polish and pitch to grind and polish it.
Nov 01, 2011· Fixed post mirror grinder advice. By Velikovsky, March 4, 2011 in DIY Astronomer. Prev; 1; 2; Next; Page 1 of 2 ... Do you know if its possible to use a pitch lap for coarser grinding? I could make a tool but my gut feeling is a tile tool will make bigger scratches when its bedding in at the start forcing me to use even rougher powder to …
The key to successful mirror grinding is randomness in stroke numbers and tool and disc rotation. Adding more randomness with a tile tool made from tiles that have been smashed with a …
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 Telescope Making" Book 1.
We provide a complete line of amateur telescope making (ATM) supplies including, Mirror kits, Pyrex, abrasives, pitch and polishing compounds ... steps are used to produce abrasive grains of like shape and edge for longer and more economical grinding action. ... This is a special formulation of a loaded pitch which can be used to join tools or ...
31 · The center will deepen during the first stage of fine grinding as contact is achieved across …
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
Jumping into Mirror Making Michael Mills. I have been preparing to grind my own primary mirror for a long time. I've collected many fine books on telescope making and mirror grinding, including Richard Berry's Build Your Own Telescope, Sam Brown's All About Telescopes, and Jean Texereau's How to Make a Telescope.I read through all of these books, ordered a 6" mirror …
Lens & Mirror Making Best lenses and mirrors are both … Grinding Motion Move mirror back and forth over tool & grinding compound After number of strokes rotate mirror, tool in opposite direction
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.
The same tools and equipment are used as in rough grinding. For the finer grades of grit, many people find it easier to pre-mix them with water in squirt bottles and apply the grit and water to the tool and mirror …
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 pla...
Grinding, Polishing and Figuring Thin Telescope Mirrors . Part 2 - Polishing . Abridged from an article appearing in Telescope Making #13 ... Your pitch lap requires a base, something to pour the pitch on. It can be flat, or it can have the radius of your mirror on it. The grinding tool is traditionally used by TMs.
Mirror-O-Matic grinding machine. When I decided in 2009 after a ten-year break to get into mirror making again, it quickly became clear to me that I would need to construct machine, as hand grinding big mirrors is not something very beneficial for the hands of …
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The mirror (or tool) was then carefully placed on top of the tool (or mirror) and grinding started (i.e., pushing the glass disk on top back and forth). The procedure was quite similar to grinding a smaller mirror, except that the disks are heavier.
My Mirror Grinding Machine. For a long time I've wanted to build a machine for grinding telescope 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.
Mirror grinding machine construction log I started thinking about building my own mirror grinding machine several years ago. ... Cleaned mirror, platter and tool, dried mirror and check with low angle light. No Pits visible. Very uniform surface under 7 power loupe. Aug 5, 2003 I was off to the Nova East Starparty for the weekend, a good ...
The tool's total volume will be equal to the volume of the cylindrical part v = PI*(r^2)*t plus the volume of the hogged sagitta on the mirror v = PI*(r^4)/(8*f) where v are the volumes of the two portions of the shape, r is the radius of the tool, t is the edge thickness of the tool, and f is the focal length of the mirror.
Grinding, Polishing and Figuring Thin Telescope Mirrors . Part 2 - Polishing ... 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. ... The diameter of the pitch lap, like the diameter of the grinding tool, is up to ...
Making A Mirror Polishing And Figuring Tool By Allen Malsbury General: Polishing a mirror is needed to remove those last small pits left behind by the fine grinding process.
Find best value and selection for your Telescope Mirror Grinding Tool search on eBay. World's leading marketplace.
The tool-on-top or mirror-on-top swap can help to adjust if you've gone too deep by favoring supporting the tool at the edge or supporting the tool in the center causing greater amounts of material being taken away at the edge.
A solid tool traps abrasive in the center of the mirror and resists grinding the mirror spherical. When you first start a new and smaller abrasive, this shows up as a tendency to form a large bubble in the center, especially in the larger abrasives.
telescope mirror grinding machine based on Dennis Rech's M-o-M 20
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