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2016-9-14 When grinding thin mirror blanks, be conscious of downward pressure, which if excessive, may bend the mirror blank momentarily out of shape. While this is not a problem during rough grinding (as the amount of flex is exceedingly small) the effect becomes important as you reach the later stages of making your telescope mirror.
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2015-12-17 Fused silica between thin blanks supports the mirror and also keeps the weight to a minimum. These blanks have the lowest expansion rate and are also the most expensive. Flat surfaces or pregenerted blanks are available. Light Weight: Thin Pyres blanks are available which are less than the recommended theoretical 6:1 ratio thickness.
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2007-2-13 My favorite method is to grind with the chordal stroke a bit deeper (0.2-0.3 mm on this mirror size) than the target saggita , then use TOT until end of grinding. This saves a lot of grit! As you might noticed by now, much of the grit is wasted as it falls in
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AGI can manufacture mirror blanks up to 40” in diameter; AGI can diamond machine ID holes into your mirror blank; AGI can produce elliptical mirror blanks in 45 degree and 90 configurations; AGI can manufacture mirror blanks from any of our low expansion materials; Need more than one telescope mirror blank? Quantity discounts are available.
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2012-3-19 It is a fine-looking, near full-thickness, 10 inch diameter blank that I intend to grind and polish into a 1st class telescope mirror. Here is a stack of my home-made 8 and 10 inch mirror blanks. The second from the bottom is the one above. I can use the thinner blank below it as the grinding
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2020-11-28 Mirror blanks - posted in ATM, Optics and DIY Forum: Where are people getting mirror blanks from. I am being given an 8 inch mirror blank and grinding kit. After I do that mirror I want to grind a 14 to 18 inch mirror.
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2021-6-17 The material is transparent, homogeneous, free of visible bubbles and free of internal stress or stain (as seen in the polarizer test). The blanks are cut from large sheets, they are considerably flat on both sides and come with a ground edge. Countless fine mirrors have been made with them for decades.
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31 行 2020-5-19 The curve is ground into the mirror face using a grinding tool. The curve is pre
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2016-6-12 What are the best sources for mirror blanks? - posted in ATM, Optics and DIY Forum: Ever since I found Stellafanes mirror making page, Ive been itching to build my own telescope. Im going to start with a 6-8in. Newt (the classic beginning ATM project!). All I need now are the materials! I can find the yogurt containers pretty easily. For the rest of it, I had to do a little searching.
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2016-9-14 FORCE. When grinding thin mirror blanks, be conscious of downward pressure, which if excessive, may bend the mirror blank momentarily out of shape. While this is not a problem during rough grinding (as the amount of flex is exceedingly small) the effect becomes important as you reach the later stages of making your telescope mirror.
Read More
2015-12-17 TELESCOPE MIRRORS, BLANKS, TOOLS, TESTERS, GRINDING MATERIALS, POLISHING MATERIALS, ALUMINISING, MIRROR BOX, RONCHI, LASER, FOUCAULT, ... It doesn't take much more to make a Schmidt-Cassegrain mirror. Blanks are supplied with a started hole in the middle eliminating having to drill. The primary mirror is a full parabola and the secondary is a ...
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Glass Fab Inc. - Rochester, NY. Manufacturer of custom blanks. Products include fused quartz and silica, optical and filter glasses, and low/ultralow expansion glasses. Capabilities include annealing, slumping, sawing, grinding, edging, drilling, waterjet cutting, and CNC shaping and generating. •
Read MoreWe recommend Pyrex over plate glass simply because it is much easier to build your first mirror with pyrex. The low coefficient of expansion of Pyrex makes a difference during the grinding process. Plate Glass, particularly thin blanks, can be warped by the warmth of your hand, expandings the glass into the tool, and grinds unevenly.
Read More2020-11-28 Mirror blanks - posted in ATM, Optics and DIY Forum: Where are people getting mirror blanks from. I am being given an 8 inch mirror blank and grinding kit. After I do that mirror I want to grind a 14 to 18 inch mirror.
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2015-8-14 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
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2020-5-19 Rough Grinding The first milestone is putting a curve into the mirror face. The curve's depth dictates the mirror's focal length. The curve should be spherical. Creating the curve can be done by several methods: The curve is ground into the mirror face using a grinding tool. The curve is pre-generated for you.
Read More2016-6-12 What are the best sources for mirror blanks? - posted in ATM, Optics and DIY Forum: Ever since I found Stellafanes mirror making page, Ive been itching to build my own telescope. Im going to start with a 6-8in. Newt (the classic beginning ATM project!). All I need now are the materials! I can find the yogurt containers pretty easily. For the rest of it, I had to do a little searching.
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2012-7-3 After 10 to 20 minutes, the grinding compound will exhaust itself and thin out. If you persist, the chance of creating a bad scratch or sticking is high. Clean mirror and tool and recharge. 9 micron will take you 2 hrs to 8 hrs depending on tool and mirror size. The mirror
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2010-8-14 I prepared four such blanks. One for the mirror, one for the tool, another for the tool pitch lap, and the fourth for the mirror pitch lap. Grinding the secondary is just like grinding any other optic except in minature. I ground the secondary with the mirror on a workstand and worked the tool on top just like I would grind a larger mirror.
Read MoreWe recommend Pyrex over plate glass simply because it is much easier to build your first mirror with pyrex. The low coefficient of expansion of Pyrex makes a difference during the grinding process. Plate Glass, particularly thin blanks, can be warped by the warmth of your hand, expandings the glass into the tool, and grinds unevenly.
Read MoreGlass Fab Inc. - Rochester, NY. Manufacturer of custom blanks. Products include fused quartz and silica, optical and filter glasses, and low/ultralow expansion glasses. Capabilities include annealing, slumping, sawing, grinding, edging, drilling, waterjet cutting, and CNC shaping and generating. •
Read More2020-11-28 Mirror blanks - posted in ATM, Optics and DIY Forum: Where are people getting mirror blanks from. I am being given an 8 inch mirror blank and grinding kit. After I do that mirror I want to grind a 14 to 18 inch mirror.
Read More2013-2-26 The casting process leaves the blanks slightly oversize, and the edges of the blanks rough, and not quite perfectly round. I have tried various methods of cleaning up the edges of the blanks. None have been totally satisfactory. I eventually decided I needed to build a dedicated edge grinding machine. This is how I did it.
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2002-1-25 Mirror grinding is a noisy, messy, wet activity. It doesn't take up enough of your attention to fully occupy you, but it does take up just enough that you cannot do something else like watch TV, listen to the radio, etc. You're pretty much stuck there looking at your hands, and adding water or
Read More2016-6-12 What are the best sources for mirror blanks? - posted in ATM, Optics and DIY Forum: Ever since I found Stellafanes mirror making page, Ive been itching to build my own telescope. Im going to start with a 6-8in. Newt (the classic beginning ATM project!). All I need now are the materials! I can find the yogurt containers pretty easily. For the rest of it, I had to do a little searching.
Read More
2020-7-29 Pyrex Mirror Blanks* Size (inches) Thickness (inches) Price US$ 1.00. 0.75. $7.95. 1.75. 1.00. $8.95 *Strain Birefringence: 10 millimicrons, or less: Very sharp and long lasting to help you form your curve fast and accur ately. You can rely on Willmann-Bell’s optical grade abrasives because they are accurately graded to ensure that no larger ...
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US suppliers of Mirror Blanks, Grinding Polishing Supplies, and Telescope Making Supplies. Astronomy Clubs Many can offer help with your project. Astronomy Conventions Star Parties A good place to look at various telescopes and chat with their owners. Mirror
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2014-7-21 Placing the mirror face up and grinding with a moderate "W" stroke will also move the curve toward the edge, and tends to produce a more spherical surface. Leaving the mirror grossly hyperbolic will make fine grinding difficult. Fine Grinding . We've all heard stories about fine grinding taking hundreds of
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2010-8-14 I prepared four such blanks. One for the mirror, one for the tool, another for the tool pitch lap, and the fourth for the mirror pitch lap. Grinding the secondary is just like grinding any other optic except in minature. I ground the secondary with the mirror on a workstand and worked the tool on top just like I would grind a larger mirror.
Read More
