I like to use tools that are 75% the mirror size. The tool is lighter and easier to handle, and still grinds fast enough. Plaster tools over 20" in size are heavy and awkward to handle. Make a grinding tool from finishing plaster, hydraulic cement, casting plaster, or concrete, available at .

Tile tools grind faster, and you can make 2 mirrors instead of one. Or you can share the costs of a mirror kit with a friend and make a mirror each. A tile tool is a disc poured from cement, with a layer of hard, porcelain tiles epoxied on it.

For large thin mirrors, say 12 inches [30cm] or greater and 1.5 inches [4cm] or thinner, the mirror back must be ground flat, or at least regular in shape before beginning fine grinding the mirror's face. Cast a tool specifically for the mirror's back, and grind with 220 grit, inspecting for low unground spots. Grind until they disappear.

Tiles Grind Away: You may grind through your tiles at the edge, especially if you are making a very fast (low focal ratio) mirror. In that case, you can epoxy a second layer of tiles on over the first. This was done with the tool shown at left. 2. Tiles Come Off: You can see a tile has

I like to use tools that are 75% the mirror size. The tool is lighter and easier to handle, and still grinds fast enough. Plaster tools over 20" in size are heavy and awkward to handle. Make a grinding tool from finishing plaster, hydraulic cement, casting plaster, or concrete, available at .

GRINDING A TELESCOPE REFLECTOR WITH TOOL-GRINDING DEVICE By George F. Tauchmann Grinding telescope reflectors of 15-inch diameter and over makes it necessary to employ a motor-driven turntable. Small mirrors are generally ground and polished by rotating the tool, fastened to the turntable, and working the mirror blank by hand

01.11.2011 · 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.

This tool worked fairly well, but progress was slow nonetheless, and I didn't like all the rust stains on everything. As the mirror and tool were slowly pulverized by the grinding process, the iron in the resulting grinding "mud" instantly oxidized.

For large thin mirrors, say 12 inches [30cm] or greater and 1.5 inches [4cm] or thinner, the mirror back must be ground flat, or at least regular in shape before beginning fine grinding the mirror's face. Cast a tool specifically for the mirror's back, and grind with 220 grit, inspecting for low unground spots. Grind until they disappear.

The tool, being a copy of the glass, is also not spherical and thus needs some grinding, along with the mirror, to gain the spherical state. Typically I make a tool in about 30-40 minutes from the time that everything is pulled out until the tool is off of the mirror and the back is cleaned up so that the tool will sit flat on the table top.

This tool worked fairly well, but progress was slow nonetheless, and I didn't like all the rust stains on everything. As the mirror and tool were slowly pulverized by the grinding process, the iron in the resulting grinding "mud" instantly oxidized.

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.

Increasing tool posture angle decreases the grain cutting depth to the critical cutting depth from brittle cutting to ductile cutting, but it increases the risk of tool interference. The mirror freeform grinding may be parameterized by material behavior, tool size and posture, grinding conditions and abrasive tool .

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

• MIRROR DIAMETER	2.5	3	3.5
  4	0.100	0.083	0.072
  6	0.150	0.125	0.107
  8	0.201	0.167	0.143
  10	0.251	0.209	0.179

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The tool need not be as large as the mirror. 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.

11.02.2014 · 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.

05.08.2016 · Mirror Grinding Tool for a 22" f/4.0 Telescope Mirror. Report. Browse more videos. Playing next. 0:57. Grinding a 12.5-inch telescope mirror with 120 grit.

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 a musician.

17.01.2020 · Score the mirror by tracing a line across it with your cutting tool. Take your cutting tool and set its tip at one end of the line you drew in permanent marker. Press down hard on the tool and slowly draw the tip along the line you've marked. Continue to apply pressure so that the tool .

Grits & Pitch. Grits and Polishing Compound are the consumables in the mirror making process. Grits, typically of Silicon Carbide or Aluminum Oxide, in various grades, are used as an abrasive between the mirror and tool to grind the glass. Pitch is used to make a soft, conforming pitch lap for polishing and figuring. It is used with a Polishing Compound such as Cerium Oxide, which is actually ...

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