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When grinding: Apply light pressure to the wheel. Heavy pressure will result in excessive wheel wear and a rougher tungsten point. Always wear eye protection, respiratory protection, and protective clothing when using the angles controller and when welding. Remove the grinding wheel firstly before taking out the tool after use.

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. Most of them came from industrial junk yards.

Place the mirror on the tool. Start with chordal stroke to grind the mirror's center and tool' edge. After every few minutes, turn the tool clockwise 30 degree and mirror anticlockwise 30 degree. Continue grinding with at-least 12 wets. Once done, wash mirror and tool and inspect the Mirror's surface.

As all ATMs soon discover, there are many different ways to do each of the tasks required for grinding your own mirror. Making a grinding tool is no different. For smaller mirrors up to about 10 inches diameter, using a solid glass tool often works out best -- especially for the beginner.

Other tools used for hogging out also can be a metal ring or pipe flange. For my grinding tool I used Portland cement. This was readily available an cheap. For the 8" mirror I made a sub-diameter tool. The tool size ended up being 6.25" in diameter. This came out to be 78% the size of the glass I was going to grind.

Want to build your own telescope? Start with one of our telescope mirror kits. Each kit comes with a telescope 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 ...

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 pl...

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. With the coarser grits, pressure was applied to speed grinding. At the start of grinding, each ...

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.

You can use a tool 75% of the mirror diameter without much difficulty. Tools smaller than 75% have less tendency to produce a spherical curve during fine grinding. Although a 16" tool works well with a 16" mirror, for larger mirrors I would recommend a smaller tool simply because full …

Grinding Motion • Move mirror back and forth over tool & grinding compound • After number of strokes rotate mirror, tool in opposite direction • Change position of stroke alternatively • Eventually move fully around the mirror • Grit removes material from both • But …

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 it takes twice as long and is laborious. If you use the ring tool, pour your tile tool after hogging the curve, directly against the mirror.

The clamps hold the mirror centrally on the grinding platter, Freeing one should allow the mirror to be removed, cleaned and reset with out disturbing the centering. 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 …

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 ...

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. You apply grinding compounds to the tool and place the mirror blank on top.

31 Grinding the curve into the mirror face can be done by one of the following approaches: …

Just put the tool on the bottom and the mirror on top, then grind until the sagitta decreases. As you do this, sometimes the mirror and tool won't fit together perfectly and there will be bubbles in there - that's okay at this step, as you work through fine grinding though, seeing these can be a sign of a problem.

Yeah, shimming some parts on the grinder is necessary to get them flat, just like on any other machine tool. Grinding has much less tool pressure but it's still there also. Another way that works is to flip the parts repeatedly. Every grind and flip you'll grind out a bit more of any distortion.

Finally work as slowed down just enough that I could slip away on Tuesday (10/29) to check in at the mirror grinding workshop. I brought my blank along. I consulted about how to start, and as a result I decided I should build a box to store the mirror and tool in and, before making…

The tool - made from plaster - is the same as used for fine grinding but now carries a special polishing layer. The polish commonly used is cerium oxide. In the later stages, several other tools, coated with polishing pitch are in use. These tools allow to retouche the morror-surface in the range of few 1/100 000 mm (though this needs much ...

CNC Grinding of Precision Mirror Surface of Alloy Parts. Cemented carbide is prepared by powder metallurgy with tool steel or alloy steel as the binder phase and refractory metal carbides (mainly WC, TiC) as the hard phase. Its structure is characterized by the fine hard phase grains dispersedly distributed in the steel base. The hard phase in ...

Here is a 25 inch mirror on top of the fine grinding tool with pads applied. And here is the result after 5 hrs of machine polishing starting from a 20 micron aluminum oxide grind. Note that the edge is not as reflective. Materials Needed.

spin grinding a slumped mirror - posted in ATM, Optics and DIY Forum: so after taking a few years off from the hobby to get my wife well i have completed my spin grinder and am ready to tackle the 14 honeycombed mirror that you see as my avatar i had it fused to shape many years ago and it is slumped to an F5 curve. i have not used a spin grinder as yet all my work has been done by hand or ...

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. Cleanup became too much trouble, so I ceased using this technique. (Stainless steel would have been very useful in this application.)

After reading an article by Ed Jones about using diamond pellets for that task, I wanted to try the idea on the grinding machine. 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.

Use a tool sharpening stone, wet it with water, and grind at 45 degrees, around the disc, (red arrow) . A 2 mm bevel is enough Making a tile tool "In the old days" it was usual that a mirror kit is delivered with 2 glass blanks. One as the mirror, and the other as the tool. If you have such a kit, save the second glass, and make a tile tool.

32 inch Mirror on the Draper Grinding Machine: Grinding was done face up witih a smaller steel tool: … This now takes us to the first telescope 32" mirror cell, … Building a Waineo type grinding machine

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 turnout but lousy weather. We were rained out for 3 days. :-( Started on the 12micron grit today.

Mirror grinding is a grinding that the surface roughness of the workpiece is Ra< 0.01μm, and the light is like a mirror after grinding, so it can be clearly photographed. The flatness of the grinding surface is not greater than 3μm /1000mm. The surface machining of high precision and high added value parts requires mirror grinding.