Stellafane ATM: Rough Grinding
For rough grinding a 6" mirror, about 1/2 teaspoon of grit is used per wet. With finer grits, proportionately less grit is used per wet. Grits in the25 micron range are often premixed with water to form a slurry, and water and grit are squirted onto the work together from a plastic squeeze bottle (not a …
Ed Grinds a Mirror - scopereviews.com
The Grinding Guru takes a few strokes on my mirror "It's not bad," he says After a few hours of this, I get my first taste of what this work is all about. We take my mirror outside and reflect an image of the sun onto a piece of paper. I see a white round disc with clearly-imaged clouds rapidly moving across the …
Regrinding a mirror... - ATM, Optics and DIY Forum ...
Sep 15, 2009· Regrinding a mirror... - posted in ATM, Optics and DIY Forum: Heres a hypothetical from a Newbie. Just want opinions from those wiser and more experienced than I.Suppose you have a homebrewed primary mirror... not a very good one, 8 f/8. A nice, full thickness, Old School Pyrex blank that just wasnt ground very well.In your paper designing and daydreaming, you decide that youd like …
Fixed post mirror grinder advice - DIY Astronomer ...
Nov 01, 2011· Hi AllWeve been having some idle discussions about grinding mirrors here. In particular, weve been discussing building a fixed post mirror grinding turntable for cutting mirrors up to about a 24inch diameter to spherical. Its only a pipe dream at the …
MIRROR GRINDING MACHINE - YouTube
Feb 19, 2010· this video of my our first unfinished video of mirror grinding machine,made with easy available junk and bycycle parts and with help of local febrication shop
Rough Grinding a 20" Quartz Telescope Mirror on the Fixed ...
Mar 06, 2010· This video shows how to setup a mirror grinding machine for fixed-post grinding, also known as spin grinding or spinning. After setup, you'll see …
Large Homemade Telescope Making Project
Any dimming or brightning of the light indicated that the grinding was not uniform. Total time spent beveling the edge of the mirror, grinding the mirror, and cleaning up between grits was about 90 hours over a two and half month period (about 1 to 2 hours of work a day). Again, I did about twice as many wets as called for to grind the mirror.
Stellafane ATM: Grits, Polish & Pitch
As we explain in our mirror making demonstrations at the Stellafane Convention, the basic mirror making process involves grinding the mirror blank into a sphere with desired radius of curvature for the target focal length. We then polish this sphere smooth, and then slightly alter it into a parabolic curve.
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Mirror Grinding Machine - YouTube
Jun 24, 2013· this is my nearly completed fixed post mirror grinder. still some work to do left, but this is a test for functionality. there's also a short vid on my digital home built kiln controller, and more ...
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, gear boxes, pulleys, etc.
Joy of Mirror Making: Rough Grinding - BBAstroDesigns
The center will deepen during the first stage of fine grinding as contact is achieved across the mirror face and fine grinding tool. On larger mirrors, the ring tool may leave the zones part way to the edge a little underground. For these mirrors, as you near the depth, you can alter the strokes to be off-center.
So you really want to build a Telescope Mirror. - Astronomy
So you really want to build a Telescope Mirror. ... want to be very careful with the Cerium Oxide as that part of the making of a mirror is a different process from the grinding of the mirror and you don't want to get the abrasive grits mixed up with the Cerium Oxide which is to be used as the polishing compound.
Mirror blank kit - ATM, Optics and DIY Forum - Cloudy Nights
Jun 23, 2014· Mirror blank kit - posted in ATM, Optics and DIY Forum: Could somebody please point me to a source where I can purchase a kit for grinding a 6" mirror …
Stellafane ATM Main Page
GOAL: You have completed fine grinding when you have: Smoothed the mirror surface until it feels "buttery soft" to the touch with pits approximately 5 microns in size so that it is ready for polishing. Shaped the mirror surface to be very closely spherical, as indicated by the Pencil Test.
Fine Grinding a 20" Quartz Telescope Mirror - YouTube
Mar 10, 2010· Gordon Waite shows some steps during fine grinding of the 20" mirror. As the grind progresses through the grades of abrasives, see the technique Gordon uses to change from 5 …
How I built an edge grinder for telescope mirror blanks.
I have been casting my own telescope mirror blanks for a few years now. How I do it is explained elsewhere on this web site. 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 …
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Mirror grinding - scopemaking.net
A good starter size is the 150 mm (6") mirror. A 200mm (8") will also work. 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.It is cheaper, it is softer and grinds faster, needing less abrasives and with these small sizes, the low expansion glass like Pyrex has no practical (visible at ...
Making a homemade mirror grinding machine - ATM, Optics ...
Mar 06, 2006· Making a homemade mirror grinding machine - posted in ATM, Optics and DIY Forum: I want to make a motorized mirror grinder, any good info on this, i have a couple geared motors, low speed high torque. One more question ...will 1 1/2 shaft size pillow block bearings work good for a homemade EQ mount? Thank you, John
Newport Glass Works, LTD. Grinding, Polishing and Figuring ...
I recommend #60 carborundum for rough grinding. By the way, as in all optical work, be sure that you always maintain bevel on the edge of the mirror throughout grinding. If your mirror is light enough to grind on top, grind much the same way you would a smaller mirror.
Telescope Mirror Blanks / TelescopeMirrorBlanks.Com ...
Please see the Buy Telescope Mirror Blanks page for low prices on plate glass mirror blanks. If you'd like to buy a complete mirror grinding KIT, with all abrasives and grinding tool included, please see the Buy Telescope Mirror Kits. website for the lowest prices on plate glass telescope mirror grinding kits.
how do they grind a polished bevel on a mirror
Mirror grinding - Scope Making. How do you turn a chunk of glass into a telescope mirror, with a surface accurate to a ... In some countries telescope mirrors are unavailable, so they need to be imported, ... polish, and pitch, your expenses are very near to a ready made mirror. ...
Grinding my first 6" f/8 Telescope Mirror - YouTube
Oct 27, 2011· This video shows a few initial stages of making a primary mirror for a 6" f/8 telescope. I'm a newbie so bear with me in my ignorance as a first timer making a Telescope. I actually purchased ...
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Telescope Mirror Kits - Firsthand Discovery
Want to build your own telescope? Start with one of our telescope mirror kits. Each kit comes with a telescope mirror blank and all the abrasives (silicon carbide grits and white aluminum oxide powders), cerium oxide polish and pitch to grind and polish it to your specifications.
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 very beneficial for the hands of a musician.
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