rough grinding mirror

  • Joy of Mirror Making: Rough Grinding - BBAstroDesigns

    31 行 · Rough grinding a telescope mirror The Joy of Mirror Making Mel Bartels 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.

  • Rough Grinding of a Telescope Mirror | Guy's Math & Astro Blog

    Dec 15, 2014 · 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. Then turn the lower piece of glass to the left by about 15 degrees, and the upper piece by about 10 more degrees.

  • Rough Grinding a 20" Quartz Telescope Mirror on the Fixed ...

    Mar 07, 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 how abrasi...

  • TELESCOPE MIRROR MAKING HOW TO PART 1: Rough Grinding ...

    Apr 03, 2020 · Welcome to my channel - in this video, we will begin to make a telescope mirror from scratch! I'll be showing you the basics of telescope mirror grinding!Her...

  • Rough Grinding an 8.5 inch Telescope Mirror - YouTube

    Mar 30, 2018 · The first phase of rough grinding my 8.5 inch Pyrex disc into a telescope mirror. Including beveling the edges, measuring sagita (central depth), and grindin...

  • Rough grinding a mirror blank - YouTube

    Apr 27, 2011 · Pushing glass. The initial rough grinding of a 10 inch diameter, f/5 telescope mirror blank. See updates on this project at mdpub.

  • Rough Grinding of a Telescope Mirror | Guy's Math & Astro Blog

    Dec 15, 2014 · Rough Grinding of a Telescope Mirror. 15 Monday Dec 2014. Posted by gfbrandenburg in History, Telescope Making. ... We use both hands to make the mirror travel in a circular path in either direction for about 6 turns, grinding the center of the mirror mostly against the edge of the tool. (This needs to be demonstrated!)

  • TELESCOPE MIRROR MAKING HOW TO PART 1: Rough Grinding ...

    Apr 03, 2020 · Welcome to my channel - in this video, we will begin to make a telescope mirror from scratch! I'll be showing you the basics of telescope mirror grinding!Her...

  • 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 opposite, a shallow mirror (e.g. F/D = 8) will be performing very well on planets and the moon.

  • Grinding mirror using CNC router - ATM, Optics and DIY ...

    Feb 22, 2010 · 1/4 λ is on the order of 0.000006in. My Son who is a qualified milspec machinist doesn't get closer than 0.0001in. I suppose you could rough grind the tool and initial mirror shape but this will only work if you CNC router is 3D.

  • How I built an edge grinder for telescope mirror blanks.

    The rough grinding drum very quickly got the edge trued up and round and to the correct diameter with a minimum of effort and drama. A jet of cooling water was directed at the grinding drum at all times to prevent over-heating the glass and causing chips to spall out of the edge. The water came from a large pump sprayer tank.

  • Grinding mirror using CNC router - Page 2 - ATM, Optics ...

    Jun 11, 2007 · Rough grinding is but a small time period compared with the rest of what you'll need to do. You can always try innovative methods on the next larger mirror. With the CNC, I'd be concerned with chip damage on the edge.

  • Stellafane ATM:Mirror Making Myths

    With the Mirror on top, the tool on the bottom, and coarse grit in between, we start grinding with the mirror overhanging the tool. We rub the center of mirror against the edge of the tool, and this wears a depression in the center of the mirror (the edge of the tool wears down also, so that the tool becomes convex (a "hill" in the center) and ...

  • First-Time Mirror-Making - 6in Mirror Log - ATM, Optics ...

    Nov 16, 2021 · First-Time Mirror-Making - 6in Mirror Log - posted in ATM, Optics and DIY Forum: Well... I got the itch. I ran across too many threads and posts about making mirrors to ignore them. Now, I have my very own 6 mirror-making kit from Firsthand Discovery and Im starting to head on my way to building my first Dobsonian telescope. Why do I want to do this..?

  • Stellafane ATM: Fine Grinding

    in the 2001-02 Stellafane Mirror Class. Fine grinding refines the basic shape you have ground into the surface of the glass with rough grinding. The sequence of ever finer grits that you use smoothes the rough surface that was made in rough grinding, and prepares you for polishing. You are also refining the shape of the surface to be a section ...

  • Stellafane: Telescope Making

    Rough Grinding in Mirror Class. We have offered mirror making classes annually since 1995 in Springfield, Vermont, and have helped many people complete their mirrors with guidance from our expert instructors. Registration is required, please sign up early, as we have had many full classes and un­for­tunate­ly have had to turn some people ...

  • Grinding - Amateur Telescope Making - India

    Fine grinding and smoothing Once the rough grinding has been completed the mirror, tool, work plate etc. should be thoroughly scrubbed and cleaned using soap solution and an old tooth brush for example. If possible, the cleats should be replaced with new ones; the work post should be cleared, the newspapers and used cloth pieces thrown away.

  • Joy of Mirror Making: Introduction - BBAstroDesigns

    Rough Grinding. Unless 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 into the mirror. Grinding a 6 inch [15cm] mirror to F/2.8 using a ring tool. Mirror ...

  • Rough grind | Article about rough grind by The Free Dictionary

    Rough grinding the easy way: say goodbye to the drudgery of hogging out a curve in your mirror blank Now I bring it out (heavy beast!) every few weeks to grind another 10 pounds of whole grain flour for the fridge for my baking needs (bread and cookies), and to rough grind wheat for "wheatena" porridge.

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  • ROUGH GRINDING THE MIRROR - Sidewalk Astronomers

    The rough grinding usually digs a depression in the center of the upper disc which gradually deepens and spreads toward the edge of the disc. It is a fairly simple matter, by regulating the extent of overhand, to arrange to have the curve on the mirror face reach its proper depth just as the edge of the ground out area reaches the edge of the ...

  • Telescope Mirror Making: Part 3, Rough Grinding ...

    Gordon Waite sets up his fixed-post mirror grinding machine to begin rough grinding on an 11 f/4.3 telescope mirror. He uses a grinding tool made from dental plaster and steel pieces to speed up grinding. Gordon shows the setup for spin grinding at high speeds and with added weights to get the job done as fast as possible.

  • How to Grind a Telescope Mirror in 10 Easy Steps – Starry Nova

    Oct 05, 2021 · Sixth Phase: Rough Grinding. After having the ground and face of the mirror flat through the 220, you are good to begin rough grinding the curve into the mirror. You can use #60 carborundum tools for grinding. Note that you should always maintain an angle on

  • Mirror grinding - scope making

    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 ...

  • Fast Mirror Grinding & Polishing - The ATMs Workshop

    Nov 15, 2001 · 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 CeO. His own 17.5" mirror took about nine hours to

  • Issues with Rough Grinding - ATM, Optics and DIY Forum ...

    Jan 27, 2021 · Issues with Rough Grinding - posted in ATM, Optics and DIY Forum: Hi, I am in the process of rough grinding a 12.5 diameter x 1.5 thick F6 mirror blank that I cast myself in a kiln and need some help/advise. I am using a 9 diameter tile tool (see pic below) mounted to a patio block, 60 grit silicon carbide and spinning (TOT) at about 50 RPM.

  • Astronomy: Making a Mirror | El Camino College | Torrance, CA

    In order to achieve a desired focal length, it is necessary to periodically measure it during rough and fine grinding. An easy way to measure the focal length is to let the sun reflect off the mirror and measure the distance from the mirror to the image of the sun as shown below.

  • Telescope Mirror Making

    The rotating table set up for a 6" mirror. The central pin is a 1/4x20 bolt. Two of the furniture glides are shown. For a 12" mirror, I just used smaller blocks. I use a rotating table for fine grinding and polishing. Rubber feet on the bottom of the base are all it needs to keep it in place on the kitchen counter.

  • Telescope Mirror Blanks - Firsthand Discovery

    Telescope mirror blanks for amateur telescope makers. We have a variety of low thermal expansion borosilicate glass blanks for making a high quality telescope mirror to your own specifications. View as Grid List. 8 Items . Show. per page. Sort By. Set Descending Direction. 4.25

  • How is the mirror polishing finish done on stainless steel ...

    The mirror finish is achieved by mechanically treating the surface with a series of gradually refined abrasive materials. At this stage, the deep scratches must be removed because any surface defects on the final product are very noticeable. ... Generally, there are three processes for grinding the parts: rough grinding, semi-finishing, and ...

  • Rough grind | Article about rough grind by The Free Dictionary

    Rough grinding the easy way: say goodbye to the drudgery of hogging out a curve in your mirror blank Now I bring it out (heavy beast!) every few weeks to grind another 10 pounds of whole grain flour for the fridge for my baking needs (bread and cookies), and to rough grind wheat for "wheatena" porridge.

  • Hogging out | Telescope Building

    Hogging out. The strategy here is to use a “ring tool” to “hog out” the spheroidal curve roughly. I’ve decided to grind to f/6.25 for a focal length of 78 inches. The ring tool: a 6″ steel disk about 1/2″ thick. Folks on campus helped me with this.

  • rough grinding - English definition, grammar ...

    A method of super-mirror finishing with electrolytic grinding for the internal surface of a small-diameter tube which comprises a rough grinding process and a mirror grinding process. patents-wipo The rough grinding of the sample is preferably carried out when measuring the moisture content of the sample, and the heating of the roughly-ground ...

  • Waite Research :: 15" F4.5 Telescope Mirror

    Rough polishing was a high-speed process using a fixed-post polishing machine. The step is performed to rapidly remove the pits left over after fine grinding. The fixed-post method leaves several zonal bands easily visible in the Ronchigram. The mirror is slightly oblate, as seen be