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how to grind a telescope mirror

Mirror grinding Telescope making

There are many reasons for grinding your own mirror. Either you want a unusual size, or focal length, or to satisfy your curiosity, or to have the "pride of achievement" by fabricating something as precise as a telescope mirror.

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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.

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Grinding my first 6" f/8 Telescope Mirror YouTube

Oct 28, 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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Grinding a 25-Inch F3 Telescope Mirror: Thinning and

Dec 16, 2014· Gordon started with a 2" thick telescope mirror that weighed about 70 pounds. By thinning the blank, he's lightened the mirror by about 20 pounds! This video explains how he ground off the excess

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Hand Grinding a Telescope Mirror Make:

May 30, 2014· 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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Preparing to Grind a 22" f/4.0 Telescope Mirror YouTube

Feb 10, 2014· This video shows preparations for grinding a 22" f/4.0 telescope mirror. This is the first mirror of a pair that will become a 22" binocular scope! Gordon Waite shows how to evaluation the

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Joy of Mirror Making: Rough Grinding

31 rows· The center will deepen during the first stage of fine grinding as contact is achieved across

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HOW TO: telescope mirror grinding! Part 1 YouTube

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!Here I begin to rough grind the mirror!

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Grinding your own mirror Cloudy Nights

Dec 31, 2016· Page 1 of 2 Grinding your own mirror How is it possible to get accuracy in the nm? posted in ATM, Optics and DIY Forum: So I have read forum questions & answers on topics such as whether it is possible to use a 3D printer to design and print out a telescope mirror, or design an array of paraboloids this way for a segmented design, and the answers have been, no, the 3D printers dont

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Stellafane ATM: Measuring Sagitta

Measuring Sagitta (Depth of Curve) During grinding, the mirror is too rough to measure the focal length optically to any reasonable precision. Therefore, we take a mechanical measurement of the Sagitta, or Depth of Curve, and using some simple formulas calculate the focal length.

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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 t...

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Stellafane ATM:Mirror Making Myths

Mirror Making Myths. Mirrors can only be made with Special Precision Equipment in Expensive Factories or Labs; Not True! Telescope mirrors can be made in your kitchen, basement or garage with nothing more than the mirror blank and a second piece of glass (called the tool) to rub the mirror against with an abrasive grit and water slurry.

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How to Grind a Telescope Mirror Know About Life

How to Grind a Telescope Mirror Reflector telescopes, such as Newtonian and Dobson telescopes, use curved mirrors instead of lenses to focus light. Mirrors are much easier to make than lenses and as a result amateur astronomers can build large aperture telescopes after grinding the

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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.

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Amateur Telescope Making Main Page Stellafane

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 Making Courses & Workshops

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Joy of Mirror Making: Introduction

Stone tools go back 3.3 million years. Pounding, scraping, knapping, grinding combined with fire, heat, melting leads us today to grinding telescope mirrors from glass. Making a telescope mirror is one of the most satisfying and sublime joys you will experience. It's also arguably the most accurate surface made by man or machine.

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tut44 Making A Mirror Grinding Tool Asterism

want to learn more about Newtonian telescopes the internet is replete with information about all types of telescopes. Typically, the primary mirror is made of glass. Pyrex is commonly used for the primary mirror because of its thermal stability, but for small mirrors, plate glass will work fine too. Telescope mirrors are relatively thick.

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Telescope Mirrors, Blanks, Secondaries, Grinding Materials

Telescopes & Astronomy Telescope Mirrors, Blanks, Tools, Aluminising, Testing, and Materials for Mirror Making. Please email or call for information, pricing confirmations and shipping prices. TELESCOPE CONSTRUCTION WEB SITE. OTHER PRICE LISTS. UPDATED 7th June 2014. TELESCOPE GLOSSARY. BBC Sky at Night. How to Make a Mirror.

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How to grind a parabolic mirror for telescope ? Yahoo

May 06, 2010· Labour is so much cheaper in China where almost all telescopes are made nowadays. Kits are available with all the necessary materials to grind and polish a mirror from Newport Glass Works. You grind the mirror blank by rubbing it on a glass tool using increasingly fine abrasives.

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Stellafane ATM: Grits, Polish & Pitch

The table below can be used as a rough guide in obtaining the grit, polish and pitch necessary for a small mirror project. Be aware that buying small quantities of is often difficult and expensive, and the first time mirror maker usually does best to purchase a mirror making kit which includes the necessary set of abrasives and pitch.

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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.

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Newport Glass Works, LTD. Grinding, Polishing and Figuring

Grinding the back flat is just the first step in preventing astigmatism. The next step is the proper mirror support. Fine grind and polish the mirror face up. A thin mirror bends over the edge of the tool if it's worked on top, so the problem reduces to supporting the mirror from its underside.

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

(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, which you really should look at! A. The math is

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