Large Thin Mirror Making - Mel BartelsHaving made a dozen mirrors of 16" to 30" in size, it is my suggestion that 2" thick pyrex glass is significantly easier to work with than thinner pyrex glass. In particular, there is much less concern for astigmatism during fine grinding, and flexing of the mirror at the.16 inch plate glass fine grinding,grinding, polishing and figuring - thin telescope . - Newport GlassI recommend fine annealed for telescopes. I don't know if coarse annealed would suffice because I've never tried it, It's probably a hit-or-miss thing - most will work and some may fail. The prices for sheet glass vary quite a bit. The last time I checked (late 1980), pieces 16" diameter by 1.62" thick were about $225, and 24".
Herb's Glass & an 8-inch mirror - RetroTechnologyThe story is I bought some sheet glass at auction a few years ago; 33 inches square (about a meter) by 8/10ths inch thick (about 2cm). Early in 2005 I . Mirror Work on this page. Setup and Grinding Fine Grinding Scratch remediation I Polishing pads I Scratch remediation II a careful fine session Polishing pads II Pitch tool.16 inch plate glass fine grinding,16 inch plate glass fine grinding,Mirror grinding - Telescope makingtelescope making, mirror grinding, homemade tripod, eyepieces, astronomy. . A 400 mm (16") mirror is practically impossible to find under 2000 € in Europe . Past the . Most ATM books and websites recommend a Pyrex® mirror blank, but in my opinion, annealed plate glass is better for this first, "learn and practice" mirror.John Frank
Fine Grinding. Polishing. Pressing the Lap. Correcting. Mirror Testing. A Quick Test after the Mirror is Coated. Precautions. Find a plastic wash pan to place in your porcelain sink. If you have two mirrors keep them separate. If you have a 16 or an 18 3/4 inch green glass blank there is a special precaution. Glass has a low.
Products 1 - 7 of 7 . 10 inch Grinding Kit, $108.65USD, Buy Now. 12 inch Grinding Kit, $140.75USD, Buy Now · 14 inch Grinding Kit, $176.80USD, Buy Now. 16 inch Grinding Kit, $207.80USD, Buy Now · 20 inch Grinding Kit, $336.95USD, Buy Now. 6 inch Grinding Kit, $49.40USD, Buy Now · 8 inch Grinding Kit, $63.58USD.
Rough grinding a telescope mirror. . Here are 42 inch [107cm] and 30 inch [762cm] mirrors slumped and annealed to F2.8 ready for fine grinding. The first method is by far the most popular. Grinding the . I generated a 16 inch [41cm] f/6 plate glass mirror in about 4 hours with 80 silicon carbide grit. When the sound dies.
I recommend fine annealed for telescopes. I don't know if coarse annealed would suffice because I've never tried it, It's probably a hit-or-miss thing - most will work and some may fail. The prices for sheet glass vary quite a bit. The last time I checked (late 1980), pieces 16" diameter by 1.62" thick were about $225, and 24".
telescope making, mirror grinding, homemade tripod, eyepieces, astronomy. . A 400 mm (16") mirror is practically impossible to find under 2000 € in Europe . Past the . Most ATM books and websites recommend a Pyrex® mirror blank, but in my opinion, annealed plate glass is better for this first, "learn and practice" mirror.
Kit Includes; 12" x 12" x 3/16" thick square glass plate, 1 honing guide, 1 12"x12" black grip mat; Also 2 each 800, 1200, 1500, and 2000 grit - 41/2" x 11 sticky back .. Fixed Angle Honing Guide with Brass Roller for Wood Chisel, Planer, Blade, Graver, Flat Chisel Edge Sharpening, Clamping Width Range 0.32-3.22 Inch.
Tried recommended 1/4" plate glass to grind down rise. The method did not seem to work. With #60 carbo, tried grinding mirror with powerful chordal strokes. Good results. After 3 hours of grinding, tool is getting convex and mirror has 1/32 inch sagitta. Made template for measuring depth. To Be Done. Need to build stand.
3.4 Making the Primary Mirror. 3.4.1 The Grind; 3.4.2 The Grinding Zone; 3.4.3 Grinding Begins; 3.4.4 The Coarse Grind; 3.4.5 The Medium Grind; 3.4.6 The Fine Grind ... I got three pie dishes, two glass platters, and one white glass plate with an 8-inch bottom having a 1/8th inch deep curve. What is the focal length of that.
I can make an eight inch blank out of four layers of 5/16 glass, rather than a dozen or more layers of thinner glass. The advantage of this is that any air bubbles trapped between layers will be at least 5/16 inside the blank, and won't be reached during mirror grinding. However, I had to learn how to cut circles all over again,.
It is made from 40 mm thick pyrex sheet and is f4.67. Pyrex mirror blanks are very much harder to find these days and this had to be cut from a 20 inch square piece - in other words a 20 inch blank would have cost . For fine grinding this was covered with glass tiles stuck down with "Liquid Nails", a proprietary gun adhesive.
In use, Pyrex has about one third the coefficient of expansion as plate glass, and therefore it will settle down as night time temperatures shift much faster. You will do more observing, . 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.
One day is used to get up to the melting point of pyrex, 2150 degrees F. At this point, a 20 inch blank measures 1/16 inch larger in diameter than it will when cooled. This called for some creative engineering from the kiln builder. The molten glass remains at this temperature for a five hour 'soak'. A shorter soak will lead to an.
Dec 15, 2000 . After the bulk of the glass has been (often rather crudely) removed, a new tool is then used for the remainder of rough and fine grinding. The real grinding work ... The tape should only be as wide as the tiles are thick so that at most, the dam rises about 1/16 inch over the back of the tiles. Figure 10: Melting.
If you absolutely must have tempered glass with a hole in it, the hole or any other shaping must be done before the tempering process. . The ultra thin glass used in cell phones (and so on) is chemically tempered in a very shallow surface ion exchange process (replacing the surface sodium ions in the.
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Laminated Glass. Section 11F. Sell Sheet p. 1. Safety and Burglary-Resistant Glass p. 3. Sloped and Overhead Glazing, Skylights and Point-Supported Canopies p. 8. Sound Control p. 11. Light and Solar Control p. 17. ArmorProtect®: Forced-Entry-Resistant Glass p. 21. ArmorResist®: Bullet-Resistant Glass p. 27.
Some Portland Glass specialists are cross-trained to work on home, auto and commercial glass, while others specialize in one type of glass; similar to general practitioners . Plate glass was made by a process of grinding and polishing. . It spreads 90 to 140 inches wide at a thickness determined at the time of manufacture.
42 inch-ounces breakdown torque. • Permanent split capacitor . plate with diamond empragnated surface for sanding edges of glass to be .. Fine Grit. Half Drop OnTM quick change bit for regular grinding. 3/4" dia- meter 5/16" long diamond section. For use with adapters. IA-40100 and. IA-40100DT. Catalog #. IA-40101.
Genesis grinds most hard surfaces such as glass, fiberglass, ceramics, marble, granite, line, sandstone, composites, and some plastics. . Genesis pads are also available backed with a magnetic sheet so that different pads can rapidly be exchanged on a steel disc. . Disc diameter (in inches), 3, 6, 8, 12, 16, 20, 24.