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September 26, 2006. The true test of the amateur astronomer is building their own telescope. Grinding and polishing your own mirrors is a long, arduous process. Instead of lapping the blank by ...
Keep Reading2. ELID grinding technology applied to cemented carbide The steel-bonded cemented carbide is subjected to mirror grinding, and the surface roughness of the workpiece is Ra=0.003 μm～0.011 μm. If a finer grinding wheel (above W1) is used, the Ra value will be significantly reduced and a better surface roughness will be obtained.
Keep ReadingIf you don't have a gear box, you should stick with the M-o-M power head design. In the configuration shown, the reducer shaft output is 50 rpm, the eccentric rpm is 11, and the turntable rpm is 67. This is typical for grinding and …
Keep ReadingThe 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 CeO. His own 17.5" mirror took about nine hours to polish out completely.
Keep ReadingMirror grinding tile tool - posted in ATM, Optics and DIY Forum: Hi all, Im about to begin crafting a mirror grinding tool out of plaster and tile. In researching how to make the tool, Ive ran across some conflicting instructions. Would I create the tool flat or make it convex in accordance to the final shape of my mirror (an 8 f/8 parabola)?
Keep ReadingHighlights. •. High-efficiency mirror grinding of single-crystal diamond substrate was investigated. •. A rotary grinder with a #15000 diamond wheel was used for mirror grinding. •. A record high removal rate (0.04 μm/min) was achieved. •. The processed surface was ultrasmooth with ~0.1 nm average surface roughness.
Keep ReadingFor 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 …
Keep Reading8" F6 Mirror Grinding. For grinding tools I have read that it is recommended to use dental plaster or pure cement as a substrate. Then tiles are attached to this substrate either by glue or to embed them directly in the plaster or cement when the cast is made. Other tools used for hogging out also can be a metal ring or pipe flange.
Keep ReadingI bought a used mirror grinding kit from AstroBuySell which includes a 6" 25mm plate glass blank, matching glass tool, pitch, selection of grits etc. The kit appears to be a 30 year kit from Beacon Hill Telescopes. The first owner had taken copious notes while rough grinding out to ~F11 (0.9mm), then switching to 120 grit and smoothing.
Keep ReadingCareful when first grinding with new layers of tiles. Some may be higher than others and after stroking past the edge of the mirror and then back might snag the edge. Step 1. Use short COC strokes that don't take the edge of the tool past the edge of the mirror for a while to wear down the highest tiles. Step 2.
Keep ReadingThe well used tile tool at right illustrates a couple of maintenance issues. 1. 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 …
Keep Readingsuper mirror grinding machine manufacturer/supplier, China super mirror grinding machine manufacturer & factory list, find qualified Chinese super mirror grinding machine manufacturers, suppliers, factories, exporters & wholesalers quickly on Made-in-China.com.
Keep ReadingThe initial rough grinding process uses grit sizes of 60, 120, and 180 to carve out the basic spherical cavity. The mirror is then fine ground with grits of sizes ranging from 220-900. In both grinding processes, the grit is harder than the mirror blank and tool, resulting in a concave mirror and complementary convex tool.
Keep ReadingRoughness 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.
Keep ReadingMaking 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.
Keep ReadingYou'll want to first determine the shape of your mirror and the focal length that it will eventually have. When designing a telescope of this style, there is a very, very handy tool called Newt for the Web.You can put in your mirror diameters …
Keep ReadingGrinding Wheels. Grinding Wheels List. 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 …
Keep ReadingMirror 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. 2. Grinder ...
Keep ReadingAdvantages of CNC Glass Machining. CNC machining offers numerous advantages over conventional grinding and polishing for fabricating optical components including: 24 Hour Operation. CNC machines have the ability to work 24 hours a day, 365 days a year, only needing to be switched off for maintenance or repair. Complex Component Geometries.
Keep ReadingRemember to float the mirror on newspapers, or an old blanket folded up, or outdoor carpet. Rotate the mirror a 1/3 turn every 10 minutes. Use 1/3 'W' strokes if the tool is the same size as the mirror and use 1/2 'W' strokes if the …
Keep Reading32 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 …
Keep ReadingWhat grinding tool - posted in ATM, Optics and DIY Forum: I plan on ordering supplies to make my first mirror. Thinking an 8 f/6 From doing a bit of reading and watching the Dobson video, it seems that the tool used for rough grinding is *another* glass blank (the tool goes convex while grinding the mirror concave). So am I looking at ordering two 8 mirror blanks?
Keep ReadingMirror grinding tile tool - ATM, Optics and DIY Forum . Jul 08, 2012 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 ...
Keep ReadingThe grinding tools are only in two options: Segmented and solid. The segmented tools consist of plaster covered with ceramic tiles. While the solid comprises a glass material. It can be a disk cut off from a sheet of glass or consist of glass plates binding. ... But if the convexity is too much, consider grinding the mirror at its top. However ...
Keep ReadingMirror-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 …
Keep ReadingFig. 3 shows the envelope grinding along with tool posture angle θ and envelope trace height h e.On the parallel YZ-sections, the CL and the angle ϕ are driven by the linkage of Y-axis and Z-axis translations and A-axis rotation according to,,, .The tool path interval f x is driven by the differential translation of X-axis. The envelope trace between tool paths is …
Keep ReadingThe test is very simple. Rinse and wipe the mirror dry. Draw a grid on the mirror surface with a permanent marker (<--picture) Add the usual half teaspoon of grit, sprinkle with water and grind for a couple of minutes, rotating tool and mirror often. Rinse the mirror and inspect the grid lines.
Keep ReadingTelephone: +44 (0) 1268 728077. Stock Specification. 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 …
Keep ReadingAs 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 …
Keep Reading6）Magnetic grinding and polishing. Magnetic grinding and polishing are that forming abrasive brushes under the action of a magnetic field by magnetic abrasives for grinding workpieces. This method features high …
Keep ReadingOne way: do about 8 circular strokes. Then center the mirror on the tool. Turn the lower piece of glass to the left by about 15 degrees (1 hour on a normal clock face); then turn the upper piece of glass about 10 more degrees. Then grind away for 8 more circular strokes.
Keep ReadingMirror Grinding Tool Substrate - posted in ATM, Optics and DIY Forum: While Im trying to run down some Hydrostone in reasonable quantities for reasonable prices, Ive been wondering about using other materials. For example, what if I used a full diameter aluminum disk, faced with a positive radius equal to the desired finished radius of the mirror, then covered with …
Keep ReadingGrits & 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.
Keep ReadingWhile tools for grinding telescope mirrors is covered extensively elsewhere, I will say that the challenge posed by a fast mirror is that the sharp curvature requires your grinding surface to be made of small "bits", whether those bits are tiles, coins, nuts, or whatever. In my case, I cast the base of my tool from Hydrostone, using my ...
Keep ReadingUnless the mirror comes pre-generated, the initial curve will have to be ground into the mirror. A ring tool of half the diameter of the mirror used on top of the mirror's flat face with the coarsest grit will rapidly grind a spherical curve …
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