Build your own telescope part 1: The mirror – Thomas ...

Rough grinding. This step is about making one side of the glass concave. It will give your mirror its overall focal ratio. If you make the centre deep, you will end up with a fast telescope (e.g. F/D = 4) well suited for deep sky observations. On the …

Grinding and Polishing Tools | Product Information ...

Tools for grinding, polishing and machining various materials. Vitrified. Ceramic Grain CX Wheel. Vitrified-bonded Wheel for Gear Grinding "Gear Ace". New Super-finishing Wheel "Keen Stone". Vitrified-Bonded Wheel for Precision Grinding "LIFE KING". New Mirror Grinding Super-finishing Wheel "Mr. Neo Lapper". Resinoid.

Stellafane ATM: Materials & Tools

The Tools: Grinding & Polishing. You will need two tools: A hard tool for rough and fine grinding, and a soft tool, or pitch lap, for polishing and figuring. Traditionally, the pitch lap was made on top of the grinding tool. We recommend using plaster …

Making a Mirror. - Astronomy

Grinding/polishing machines work by rotating the bottom piece (mirror or tool) and letting the top piece freely rotate about it's central axis as it desires to do. As you watch a machine work, the upper piece will rotate at about 1/2 to 1/10 the speed of the bottom piece.

Mirror-o-Matic mirror making machine - ATM pages of ...

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 …

ROUGH GRINDING THE MIRROR - Sidewalk Astronomers

The tool should be a couple of inches smaller than the primary mirror (ex. 6" tool for 10" primary). To facilitate the grinding we may pin the tool glass between three furring nails near the end of a patio bench and sit astride the bench while we work. The procedure is simple.

Mirror-grinding of single-crystal diamond substrates with ...

On the other hand, the mirror-grinding equipment demonstrated in the present study is basically categorized as a 'depth-control process'. A feeding motion is applied to the tool to generate the removal effect, and the displacement and motion between the workpiece and the polishing/grinding tool are restricted by a slider guide rail.

Stellafane ATM: Guide to Strokes

With mirror on top, overhang mirror about 40% of its diameter over the tool, so that most of the grinding action is concentrated on the center of the mirror and the edge of the tool. Take straight strokes such that the center of the mirror travels along an imaginary chord 1 on the tool (The red arrow in the diagram). This stroke will rapidly ...

Telescope Mirror Making - myplace.frontier.com

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 …

Basics of Mirror Grinding

Basics of Mirror Grinding. Glass mirrors are typically ground from a blank, or cylindrical piece of glass, using the abrasion created by moving the mirror across a second glass blank (the tool) which is covered with silicon carbide or aluminum oxide grits. The initial rough grinding process uses grit sizes of 60, 120, and 180 to carve out the ...

How to do mirror finish grinding by a grinder ...

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.

Mirror Grinding Machine

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, …

tut44 Making A Mirror Grinding Tool - Asterism.org

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 telescope than I can build." Neither is actually correct. For many decades now, amateur astronomers have been building their own telescopes.

Re: ATM mirror grinding mechanics & marshmello test

During grinding, the mirror is slid over the tool (really, over the grit between the mirror and the tool), and my physics book says: "whenever the surface of one body slides over the other, each body exerts a frictional force on the other, parallel to the surfaces." So, the friction is in fact not between the mirror's and the tool's surfaces ...

3mirrors ALUMINUM Tungsten Electrode Sharpener …

This tool will grind 2 sizes tungsten, 2 angles tips for each size. 4 types holes 1/16" (1.6mm) 15°, 1/16" (1.6mm) 20°, 3/32" (2.4mm) 15°, 3/32" (2.4mm) 20°. 15° is 30° when the ground on tips, 20° is 40°. Each type has 3 holes that will grind different circles on diamond wheels, which will reduce diamond wheels consumption by 2 times.

SkyBadger - Mirror Grinding Machine

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 …

How To Build Automatic Telescope Mirror Grinding Tool ...

Roughness in stroke numbers, tool rotation, and disc rotation are all important factors in good mirror grinding. Making a tile tool out of tiles that have been broken with a hammer can help to increase the unpredictability of the game:) Always work with water on your hands! Prior to beginning to grind, sprinkle some water on the grit.

Large Thin Mirror Making - BBAstroDesigns

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, …

Stellafane ATM: Mirror Making Overview

Mirror grinding and figuring consists of four major steps (plus aluminizing). Rough and Fine grinding use hard tools (glass, tile or metal) and harder then glass abrasive grit (Silicon Carbide or Aluminum Oxide). Polishing and Figuring use a …

Woodware: Mirror Grinding Stand

Mirror Grinding Stand (above) The front view and top views show the Mirror Grinding Stand with its wide base (big enough to walk around on), pedestal, and small top. The top is only a little bigger than the largest mirror you wish to …

Tool setting error compensation in large aspherical mirror ...

Lastly, the model is demonstrated through testing of a concave aspheric surface. The experiment results show that the introduced models are valid for grinding in aspherical mirror, since they are solely based on the geometry and process parameters, and hence are applicable for manufacturing process optimization.

Mirror-o-Matic

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 …

Fast Mirror Grinding & Polishing - The ATMs Workshop

The mirror ended up with a very smooth, zone free, nearly spherical figure ready for final figuring. Figure 1: Polishing pads applied to a 9 inch grinding tool. Another local ATM has also tried the polishing pads with abrasive and …

Ceramic Mirror Grinding and Processing-Ceramic Mirror ...

886-2-22761213 886-2-29940141 5F-1, No. 540-1, Huacheng Rd., Xinzhuang Dist., New Taipei City 242, Taiwan

Joy of Mirror Making: Rough Grinding - BBAstroDesigns

 · Grinding the curve into the mirror face can be done by one of …

Grinding and Polishing a Meniscus Mirror – Astronomy ...

Grinding and Polishing a Meniscus Mirror. In many respects, the grinding and polishing stages of fabricating a thin meniscus telescope mirror are not different from any telescope mirror. There are lots of resources, online and in print, describing that. This article will focus on the specific issues introduced by working on such a mirror.

Mirror grinding - scope making

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.

Grind and Polish a Dobsonian/Newtonian Telescope Mirror ...

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 …

Newport Glass Works, LTD. Grinding, Polishing and …

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.