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how to grind a telescope mirror

Mirror grinding - Telescope making

2007-2-13  It is the same thing as the chordal stroke, only now you don't grind with the mirror center over the tool edge, go over the center. Again, rotate randomly, both tool and mirror. As soon as the curve has reached the edge, and your saggita is equal or slightly deeper (depending on method you use later) you can go on with the fine grinding.

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Hand Grinding a Telescope Mirror Make:

2014-5-30  This is how you make a telescope mirror out of a hunk of glass: Use a sand mixture and another piece of glass to grind away the middle of a concave shape. Repeat with finer and finer grit sand. Dave Barosso demonstrates the technique, but to do it yourself, try to visit one of the Telescope Makers Workshop‘s classes on Friday nights in Oakland.

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To Grind a Telescope Mirror SpringerLink

Minnaert M.G.J. (1969) To Grind a Telescope Mirror. In: Practical Work in Elementary Astronomy. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-3414-2_18. DOI https://doi.org/10.1007/978-94-010-3414-2_18; Publisher Name Springer, Dordrecht; Print ISBN 978-94-010-3416-6; Online ISBN 978-94-010-3414-2; eBook Packages Springer Book Archive

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Rough Grinding of a Telescope Mirror Guy's Math

2014-12-15  One way: do about 8 circular strokes. 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.

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Mirror Grinding - Take A Class Or DIY? - ATM, Optics

2017-5-11  My googling found a list of telescope building books that seemed to have enough information to grind mirrors: https://garyseronik....he-unnecessary/ However, an author really struck me with this sentence regarding mirror making: "The internet is a resource, not a mentor."

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Grinding own mirror gives you a spherical or a

2012-8-27  Share. Posted August 24, 2012. The natural mirror grinding process will create a sphere. The first part of making a mirror is to grind and polish to a sphere of the required focal length. Then the mirror is parabolised, by using special polishing strokes, that changes the figure from sphere to paraboloid.

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Grind and Polish a Dobsonian/Newtonian Telescope

Just put the tool on the bottom and the mirror on top, then grind until the sagitta decreases. As you do this, sometimes the mirror and tool won't fit together perfectly and there will be bubbles in there - that's okay at this step, as you work through fine grinding though, seeing these can be a sign of a problem.

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How to Make Your Own Telescope Mirror - Instructables

Set at the right angle it will start to make a concave curve in the glass.The angle determines how deep you want the center of the mirror to be. This is called the "sagitta". [Fig 5]After you've ground the glass to the desired depth the mirrors surface will be opaque like this.

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Rough Grinding of a Telescope Mirror Guy's Math

2014-12-15  (Part two of my description of the essential steps in making a telescope) 2. Hogging Out means making your mirror blank have roughly the proper concave shape for the focal length or f-ratio that you want. There are many articles and web pages on this,

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Newport Glass Works, LTD. Grinding, Polishing and

2014-7-21  To grind, place the mirror face up on something soft like an old piece of deep shag carpet so the glass won't rock. (The carpet will ruined.) Wet it down, add the appropriate amount of #60 abrasive, add a few pounds to the top of the tool if you wish, and grind like mad.

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Mirror Grinding Machine

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 of them came from industrial junk yards.

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24" F/6 thin telescope mirror grinding 3/4" plate -

2013-11-6  Page 1 of 2 - 24 F/6 thin telescope mirror grinding 3/4 plate - posted in ATM, Optics and DIY Forum: A friend and I have decided to grind this as a fun yet challenging project. I have ground and polished several mirrors including a 6, 8.5, 9.2, and 14.7 quartz mirror. I have decided to take the next step with this ultra-thin setup. I know it is bordering on the edge of extremely thin with a 32 ...

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How I built an edge grinder for telescope mirror blanks.

2013-2-26  The first thing I built was an extension that sits in the middle of the turntable to raise the working surface above the height of the dam. It was made from an 18 inch diameter tabletop and some scrap lumber. I drew concentric circles on the top of the tabletop in the sizes of common telescope mirror

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Flexing Spheres into High-Quality Telescope Mirrors

2020-1-14  Telescope Mirrors If you can grind and polish a sphere, you can make a telescope mirror that will leave nothing to be desired.By Alan Adler Above: Flex cell for the author’s 8-inch f/6 telescope. Compared to the diagram on page 134, this version has several minor differences. For example, it is now recommended that the multi-

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Flexing spheres into high-quality telescope mirrors: if ...

2000-11-1  Free Online Library: Flexing spheres into high-quality telescope mirrors: if you can grind and polish a sphere, you can make a telescope mirror that will leave nothing to be desired.(telescope techniques) by "Sky Telescope"; Astronomy Design and construction Telescopes

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Build your own telescope part 1: The mirror – Thomas ...

An f/8 mirror will produce darker images but higher magnification and high contrast well suited for planets, planetary nebulae and bright galaxies from the Messier catalog. You can still use an f/2 telescope to view planets and small objects by using a small focal eyepiece and barlow lenses.

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TELESCOPE MIRROR ALUMINISING - Telescopes

2015-12-17  TELESCOPE MIRROR ALUMINISING Mirror Size (ins) Aluminium + Quartz R>91% Aluminium Enhanced R>95% Silver Enhanced + Protected R>98% 6" $210AUD $245AUD $275AUD 8" $270AUD $305AUD $342AUD 10" $330AUD $365AUD $409AUD 11" $360AUD $395AUD $443AUD 12.5" $405AUD $440AUD $493AUD 14.5" $465AUD $500AUD $560AUD 16" $510AUD $545AUD

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Optical Testing of Parabolic Mirrors : 9 Steps (with ...

A mirror mount is needed to hold the mirror during testing. If the mirror is a 'thin' mirror (i.e. the thickness is much less than 1/8th its diameter) then the mount must hold the mirror without deforming it. The weight of the glass can deform a thin mirror. In my case, I was making a full-thickness mirror, which is a mirror whose thickness is 1/8th the diameter or more, so mirror deformation ...

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Grinding,Polishing and Figuring - Part 2 - Polishing

2014-7-21  Then you grind or polish the raised edge off, resulting in a turned edge when the mirror cools down. Turned edge problems: These can be a problem with any type or thickness of glass. It's by no means restricted to thin mirrors - and it's just as often a problem with full-thickness pyrex mirrors.

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tut44 Making A Mirror Grinding Tool - Asterism.org

2019-3-8  Newtonian telescope is its primary mirror. Most Newtonian primary 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

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The 8.75" f/6.7 Mirror Grind - DIY Astronomer -

2017-2-4  With this thread Ill be outlining my journey as I attempt to grind, polish, figure, and test an 8.75 f/6.7 telescope mirror. I chose this size mirror hopefully as an upgrade to my 6 f/8, yet not so big as to be over challenging for a first time mirror grind. Yep.. this is the first time Ive attem...

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How I built an edge grinder for telescope mirror blanks.

2013-2-26  The first thing I built was an extension that sits in the middle of the turntable to raise the working surface above the height of the dam. It was made from an 18 inch diameter tabletop and some scrap lumber. I drew concentric circles on the top of the tabletop in the sizes of common telescope mirror

Read More
Flexing Spheres into High-Quality Telescope Mirrors

2020-1-14  Telescope Mirrors If you can grind and polish a sphere, you can make a telescope mirror that will leave nothing to be desired.By Alan Adler Above: Flex cell for the author’s 8-inch f/6 telescope. Compared to the diagram on page 134, this version has several minor differences. For example, it is now recommended that the multi-

Read More
Flexing spheres into high-quality telescope mirrors: if ...

2000-11-1  Free Online Library: Flexing spheres into high-quality telescope mirrors: if you can grind and polish a sphere, you can make a telescope mirror that will leave nothing to be desired.(telescope techniques) by "Sky Telescope"; Astronomy Design and construction Telescopes

Read More
Telescope mirror grinding machine / pottery wheel -

2021-3-4  Up for sale is my telescope mirror grinding machine / pottery wheel. I used this machine to grind a telescope mirror and it worked great. No more walking around the barrel. Could be adapted with an overarm for a fully automated grinding machine. $125 shipped to CONUSA. Includes 3D printed mirror holder (mirror blank not included as seen in ...

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Making two matching 30 inch [0.76m] telescope mirrors

2021-4-18  Step #1: purchase glass. Goal: 30 inch [0.76m] diameter by 3/4 inch thick table top glass . Thickness: 0.75 inches . Comments: bought two 30 inch and three 42 inch (one broke in the kiln with a loud shattering bang) glass table tops from glasstopsdirect Step #2: slumping mirrors and bending glass. Goal: using a kiln, slump the mirrors to the proper curvature and anneal the glass

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10 Inch Telescope Mirror Kit - Firsthand Discovery

Save money and time by purchasing a telescope mirror kit. This kit includes an 10 inch telescope mirror blank, all the silicon carbide grits, white aluminum oxide powders, gugolz pitch, and cerium oxide polish you will need to grind and polish an 10 inch telescope mirror all bundled in one spot. This will get you on a great start to building your own telescope.

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Optical Testing of Parabolic Mirrors : 9 Steps (with ...

A mirror mount is needed to hold the mirror during testing. If the mirror is a 'thin' mirror (i.e. the thickness is much less than 1/8th its diameter) then the mount must hold the mirror without deforming it. The weight of the glass can deform a thin mirror. In my case, I was making a full-thickness mirror, which is a mirror whose thickness is 1/8th the diameter or more, so mirror deformation ...

Read More