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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.
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 telescope mirror.
2" Diamond Zero Tolerance Grinding Drum 5" Diamond convex Blade 4" Polishing Pad Grinding cup wheel stone concrete granite travertine masonry lapidary sink cut polish grinder by Diamond Abrasive and Power Tools
ROUGH GRINDING THE MIRROR. The heart of the Newtonian telescope is the comparatively long focus, parabolic mirror called the objective. It gathers light from the object and forms an image of the object in the focal plane at the eyepiece.
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.
Save mirror grinding machine to get e-mail alerts and updates on your eBay Feed. + Items in search results. TELESCOPE MIRROR GRINDING Machine Design INFO PLANS original 1951. ... MAKE OFFER Grinding Machine Tool Grinder With Wheels Machining Tools MAKE OFFER. Pre-Owned. $3,000.00. Free local pickup.
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 ...
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
The tool for grinding was made from cutting a disk to the same size as the mirror from 3/4" plywood and using duck tape to create a dam around it. The insides were filled with 1" …
The center will deepen during the first stage of fine grinding as contact is achieved across the mirror face and fine grinding tool. On larger mirrors, the ring tool may leave the zones part way to the edge a little underground.
TelescopeMirrorKits.com provides telescope makers with the most complete telescope mirror making kits available anywhere on the web. When you buy a mirror kit from TelescopeMirrorKits.com, you get TWO glass blanks - one for your telescope mirror, and the other for your grinding tool - no more hassle making a grinding tool from ceramic tiles.
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.
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Jul 08, 2012· If you are working by hand on a mirror under 12.5", make the tool the same diameter as the mirror. If you want to save time hogging out the curve, use a ring tool, such as a piece of pipe 1/2 the diameter of the mirror. You can hog with the full size tool, but …
Obviously a plaster tool can be used perfectly as a pitch polishing tool. I usually pour the tools for laps after finishing grinding with #300 grit. The tool should be dry before pouring the pitch and rubbing it with turpentine will make the pitch stick better.
Tool grinding and tool sharpening services manufacture, recondition, regrind, and provide special profiling for cutting and machining tools. Services range from the manufacturer-approved re-sharpening and reconditioning of another manufacturer's...
Another member lightly dropped his mirror on the tool while grinding - something I had done dozens of times myself to my own mirror - only to discover that he had chipped off a tablespoon-sized hunk right off the surface of his mirror.
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.
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.
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 …
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
The center will deepen during the first stage of fine grinding as contact is achieved across the mirror face and fine grinding tool. On larger mirror s, the ring tool may leave the zones part way to the edge a little underground.
Aug 09, 2011· The full 40-minute video of how to grind a mirror blank prior to having it silvered. Made in association with Terry Pearce and Simon Lang of the Camden Amateur Telescope Society, it shows you how ...
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 …
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.