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Rough Grinding Mirror

Joy of Mirror Making: Rough Grinding BBAstroDesigns

31 行· 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.

Rough Grinding a 20" Quartz Telescope Mirror on the Fixed

07-03-2010· 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 abrasiv...

Telescope Mirror Making: Part 3, Rough Grinding YouTube

23-09-2012· After hogging the mirror blank to depth, the rough grinding stage begins. In this video I am grinding with 60/90 grit. The wets are lasting about 90 seconds

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

15-12-2014· Rough Grinding of a Telescope Mirror. 15 Monday Dec 2014. Posted by gfbrandenburg in History, Telescope Making ≈ Leave a comment. Tags. Hogging, Rough Grinding (Part two of my description of the essential steps in making a telescope) 2.

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

Rough grinding the primary mirror for my 12" : telescopes

Thin mirrors are hard to work with for a first-timer. Ultralights are typically faster than f/5. Making a sub-f/5 primary as your first mirror is difficult I know because I basically did it (I abandoned a 6" f/8 halfway through polishing when I chipped it so my 6" f/4.5 was my first experience in figuring).

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

Rough Grinding of a Telescope Mirror Guy's Math &

15-12-2014· Rough Grinding of a Telescope Mirror. 15 Monday Dec 2014. Posted by gfbrandenburg in History, Telescope Making ≈ Leave a comment. Tags. Hogging, Rough Grinding (Part two of my description of the essential steps in making a telescope) 2.

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 blank.

Rough grinding the primary mirror for my 12" : telescopes

Thin mirrors are hard to work with for a first-timer. Ultralights are typically faster than f/5. Making a sub-f/5 primary as your first mirror is difficult I know because I basically did it (I abandoned a 6" f/8 halfway through polishing when I chipped it so my 6" f/4.5 was my first experience in figuring).

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

Mirror-o-Matic

Rough Grinding. Rough grinding (hogging out) is the first stage of grinding performed on a new flat blank and tool. The purpose of rough grinding is to generate a ‘dish’ in the center of the mirror. This dish is deepened until the correct radius of curvature (R.O.C.) is produced.

Help ! rough grinding 16" mirror ATM, Optics and DIY

13-07-2014· Help ! rough grinding 16" mirror posted in ATM, Optics and DIY Forum: Hello, Grinding a 16 blank, plate glass....I am currently 5/8 3/4 from the outside edge using a ring tool (7.5 lb. barbell plate, by hand) around a 55 gallon drum. I would like to get 1/4, or 1/8 from the edge, if possible. Any tips or tricks ??? Prayers ???

Grinding Amateur Telescope Making

Rough Grinding. Spread the plastic sheet on the table and cover it with three newspaper sheets. Place the mirror center about one-third of the radius (about 15 mm) inside the edge of the tool. So, the mirror should slightly be off center.

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 the mirror becomes concave (a shallow "bowl").

Homemade Telescope Making Google Sites

Here's the plate glass tool (top) and mirror (bottom) during grinding. The blanks rest on a ~1/2 inch thick layer of newspaper to provide even support. . I had the mirror rough ground to an F/8 curve at the factory to save time. With a curve already generated, I did not have to start with 60 or 80 grit.

How to Make Your Own Telescope Mirror Instructables

How to Make Your Own Telescope Mirror: [Fig 1] This is a large piece of glass a woman off Craigslist gave me. It was 40"x40" and 0.75" thick. Its what I decided to use to make the mirror. Cutting it into smaller sections can be difficult but scoring it with a glass cutter and tapping the

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 blank.

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

Rough grinding Article about rough grinding by The

I remember hearing famed telescope guru John Dobson proclaim, "Mirror making is caveman work--eat well, sleep well, and work like hell!" And there's little doubt that the most caveman-like part of the process is rough grinding.That's the stage in which you carve the initial curve into the surface of a glass blank.

Help ! rough grinding 16" mirror ATM, Optics and DIY

13-07-2014· Help ! rough grinding 16" mirror posted in ATM, Optics and DIY Forum: Hello, Grinding a 16 blank, plate glass....I am currently 5/8 3/4 from the outside edge using a ring tool (7.5 lb. barbell plate, by hand) around a 55 gallon drum. I would like to get 1/4, or 1/8 from the edge, if possible. Any tips or tricks ??? Prayers ???

Mirror-o-Matic

Rough Grinding. Rough grinding (hogging out) is the first stage of grinding performed on a new flat blank and tool. The purpose of rough grinding is to generate a ‘dish’ in the center of the mirror. This dish is deepened until the correct radius of curvature (R.O.C.) is produced.

Newport Glass Works, LTD. Grinding, Polishing and

Rough Grinding . Once you have the back of the mirror ground flat through 220 and the face reasonably flat, you're ready to start roughing the curve into the mirror. 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.

Mirror Grinding Machine Hackaday

26-09-2006· Grinding and polishing your own mirrors is a long, arduous process. Instead of lapping the blank by hand, Laurie Hall built this mirror grinding machine from scratch.

Ed Grinds a Mirror scopereviews

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

How to Make Your Own Telescope Mirror Instructables

How to Make Your Own Telescope Mirror: [Fig 1] This is a large piece of glass a woman off Craigslist gave me. It was 40"x40" and 0.75" thick. Its what I decided to use to make the mirror. Cutting it into smaller sections can be difficult but scoring it with a glass cutter and tapping the

Homemade Telescope Making Google Sites

Here's the plate glass tool (top) and mirror (bottom) during grinding. The blanks rest on a ~1/2 inch thick layer of newspaper to provide even support. . I had the mirror rough ground to an F/8 curve at the factory to save time. With a curve already generated, I did not have to start with 60 or 80 grit.

Help ! rough grinding 16" mirror ATM, Optics and DIY

13-07-2014· Help ! rough grinding 16" mirror posted in ATM, Optics and DIY Forum: Hello, Grinding a 16 blank, plate glass....I am currently 5/8 3/4 from the outside edge using a ring tool (7.5 lb. barbell plate, by hand) around a 55 gallon drum. I would like to get 1/4, or 1/8 from the edge, if possible. Any tips or tricks ??? Prayers ???

Newport Glass Works, LTD. Grinding, Polishing and

Rough Grinding . Once you have the back of the mirror ground flat through 220 and the face reasonably flat, you're ready to start roughing the curve into the mirror. 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.

Rough grinding Article about rough grinding by The

I remember hearing famed telescope guru John Dobson proclaim, "Mirror making is caveman work--eat well, sleep well, and work like hell!" And there's little doubt that the most caveman-like part of the process is rough grinding.That's the stage in which you carve the initial curve into the surface of a glass blank.

tut44 Making A Mirror Grinding Tool Asterism.org

mirrors have either a spherical or a parabolic shaped concave face. Unlike most other mirrors in your home, the mirror coating of a Newtonian mirror is actually applied to the front face of the glass, not the back. The light collected by the Newtonian primary mirror does not pass through any glass until it reaches the eyepiece. It simply

6 Levels of Polishing ranging from rough grinding to a

With 6 Levels of Polishing ranging from rough grinding to a flawless mirror finish, we can match the right Polishing Method, with the right Polishing Level to achieve a profitable cost structure. #3 Finish Grain finish. Also called Grinding, Roughing or Rough Grinding Very coarse finish. The material is

Grinding & polishing FEIN Industrial Power Tools U.K. Ltd.

Grinding & polishing From rough sanding to mirror polish. Through our wide range of products covering everything from compact angle grinders and high-frequency grinders to die grinders, we offer both hand-guided and stationary tools of between 350 and 3700 W, for applications large and small.

Telescope-Making-Supplies-vcsm Scientific Mirrors

Rough grinding powders for grinding mirrors to the required curve starting with flat (non diamond generated) mirror blank and grinding tool. Three grades of coarse grinding powders are listed below. The table advises the probable amount of each grade of powder needed to grind the mirror sizes listed.

Making a homemade mirror grinding machine ATM,

06-03-2006· 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 questionwill 1 1/2 shaft size pillow block bearings work good for a homemade EQ mount? Thank you,John

How to Make Your Own Telescope Mirror Instructables

How to Make Your Own Telescope Mirror: [Fig 1] This is a large piece of glass a woman off Craigslist gave me. It was 40"x40" and 0.75" thick. Its what I decided to use to make the mirror. Cutting it into smaller sections can be difficult but scoring it with a glass cutter and tapping the

Rough Grinding Stone Item World of Warcraft

It is crafted. In the Metal & Stone category. An item from Classic World of Warcraft. Always up to date with the latest patch (1.13.5).