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How To Grind A Telescope Mirror

How long to grind and polish a 12" mirror ? - ATM, Optics ...

How long to grind and polish a 12 mirror ? - posted in ATM, Optics and DIY Forum: Hello everyone ....I have a 12 precurved mirror blank. Its an f/5 made of 1.25 thick plate glass. I also have a matching dental plaster tool with tiles on it. The tool is a bit thick and weighs close to 5 lbs. Its a subdiameter tool thats almost 10 inches in diameter.

Hand Grinding a Telescope Mirror | Make:

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.

tut44 Making A Mirror Grinding Tool - Asterism

Telescope mirrors are relatively thick. The concave shaped face is made by repeatedly rubbing the primary glass blank over another blank called the “tool”. The tool is equal in diameter to the primary. To grind away the ... After fine grinding is complete, the mirror must be polished. It is

Grind and Polish a Dobsonian/Newtonian Telescope Mirror ...

Grind and Polish a Dobsonian/Newtonian Telescope Mirror With Hand Tools: Author's note: This Instructable was written and published by our Making and Tinkering Programs Manager, who's personal Instructable account we co-opted. He is now publishing personal Instructables over at member ID MechaNickW.Making a telescope abo…

Mirror grinding | Diy telescope, Refracting telescope ...

Grinding a 25-Inch F3 Telescope Mirror: Thinning and Flattening the Back. 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!

telescope mirror grinding / polishing machine with ...

The machine is shown grinding a 300 mm mirror.How to build a tachometer: http://florin.myip/blog/making-tachometer-grinding-polishing-machine-telescope-m...

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. Most of them came from industrial junk yards.

TELESCOPE MIRROR MAKING HOW TO: Fine Grinding - YouTube

In this video I am showing you how to make a DIY telescope mirror! This is the second part in the series, showing fine grinding in a step by step tutorial.

Telescope Mirror Kits - Firsthand Discovery

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. Please note that our kits do not include a grinding …

Can You Do It? Make your own telescope mirror, that is?

I made my first mirror when I was 14, a 6” f/9 (it was supposed to be an f/8, but I had trouble getting the curve deep enough), by myself using Thompson’s Making Your Own Telescope. It probably came out no better than 1/2 wave - I don’t know - I really didn’t know how to test well yet.

Stellafane ATM:Mirror Making Myths

Why would grind a mirror when you can buy one just as cheaply? When the North American amateur telescope making movement began in the 1920's, there were few alternatives - the only commercial telescopes where extremely expensive and often where individually commissioned. Making your own was the only way for most people.

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 ...

How I make Telescope Mirror Blanks

It is a fine-looking, near full-thickness, 10 inch diameter blank that I intend to grind and polish into a 1st class telescope mirror. Here is a stack of my home-made 8 and 10 inch mirror blanks. The second from the bottom is the one above. I can use the thinner blank below it as the grinding tool. UPDATE

Amateur Telescope Making Main Page - Stellafane

There are a lot of misconceptions about making a mirror - read this even if you don't plan to make a mirror, but just want to know how it is done - with your bare hands and a few simple tools, you can grind and figure a fine mirror with a surface accurate to a few millionths of an inch! Telescope Formulas and Design Comparator

Telescope Mirror Making: Part 3, Rough Grinding - YouTube

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 second...

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 …

Telescope Mirror Grinding Stand - Woodware Designs

Still grinding your own mirror is a key skill that makes you a real telescope maker. To grind a telescope mirror by hand you simply attach a glass tool the same size as your mirror blank to the top of a small, strong stand. You apply grinding compounds to the tool and place the mirror blank on top.

Grinding your own mirror - How is it possible to get ...

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 …

Joy of Mirror Making: Polishing - BBAstroDesigns

Causes include failing to pad and rotate the mirror when face up, the mirror's back not being a regular surface (flat or sphere), and wedge (one side of the mirror being thicker than the other) and bad glass. There are two fixes. The first is returning to 220 grit. Grind the back regular and remove wedge if needed.

Large Thin Mirror Making - BBAstroDesigns

Depth to grind the center of the mirror to is found from: mirror diameter * mirror diameter / (16 * focal length). The depth is called the sagitta, and here is the depth to grind for f/5 mirrors: Mirror Dia - Sagitta (inches) 16 0.2 18 0.225 20 0.25 22 0.275 24 0.3 26 0.325 …

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

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...

Dick Parker's Telescope Mirror Workshop: Cassegrain ...

Grinding the secondary is just like grinding any other optic except in minature. I ground the secondary with the workstand and worked the tool on top just like I would grind a larger mirror. This optic is small enough that a lens grinding machine could work well.

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

Please help support and donatehttps://www.paypal/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=LYGQMGQRUW4TSI made a 8" tool for a 10" mirror with dental...

Making a Tile Tool for Mirror Grinding (in 150 seconds ...

The condensed process of making a tile tool that will be used to grind my 8.5 inch telescope mirror. Making a mould around the Pyrex disc, mixing and pouring...

Explore how telescope mirrors are made | Astronomy

Making a telescope mirror. To start, a new mirror blank is “sanded” down to create a precise parabolic curve in a process called grinding. To do that, the blank is …

Grinding an 8″ F/10 Telescope Mirror – gordtulloch

Grinding an 8″ F/10 Telescope Mirror. For this project (my first time ever grinding a mirror) I ordered an 8″ Black Vitrified Ceramic (BVC) blank without a pregenerated curve from ASM Products in Ste-Basile PQ. Ordering from Canada is always cheaper once you factor in all the taxes – all told the kit cost about $185.

Mirror grinding - Telescope making

Well, that depends. Mostly on the mirror size you wish to grind, and the prices of the local market. In the US, telescope mirrors are the cheapest. A decent 6" (150 mm) mirror can be bought for under 100$. In Europe, prices are usually twice, if not three times that.

Grinding a telescope mirror

Grinding a telescope mirror Products. As a leading global manufacturer of crushing, grinding and mining equipments, we offer advanced, reasonable solutions for any size-reduction requirements including, Grinding a telescope mirror, quarry, aggregate, and different kinds of minerals.

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

Read Jean Texereau, How to Make a Telescope, even if you do find a good mentor to work with. It's a classic, very well written and the methods he describes are still spot on, in year 2020. I would recommend NOT starting with a thin mirror, a really big mirror, or a really fast mirror. An 8 inch f/6 or even 6 inch f/8 is a great starting point.

Making a homemade mirror grinding machine - ATM, Optics ...

Gordon will know more about the math for different mirrors and different sizes. I recall for mine it was about a 70% tool diameter. The bucket Gordon used to make the tile tool was 8 15/16", 70% of 12.5" ends up at 8 3/4". Looking back at my notes I used the tile tool primarily at the 70% zone of the mirror.

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

The math is important: you want your mirror to be a parabola, and the equation for the depth (or sagitta) that you must grind into the glass isn’t too difficult. First of all, “f-ratio” means the ratio between the focal length and the diameter of the primary mirror.

8 Inch Telescope Mirror Kit - Amateur Telescope Making ...

Save money and time by purchasing a telescope mirror kit. This kit includes an 8 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 8 inch telescope mirror all bundled in one spot. This will get you on a great start to building your own telescope.

mirror grinding kit grind and polish telescope mirror at ...

mirror grinding kit grind and polish telescope mirror at home mirror blank grinding tool grinding powders ceruim oxide optical polish View Basket (0) £0.00 ex VAT View Quote (0) Register Login

Telescope Mirrors, Blanks, Secondaries, Grinding Materials ...

TELESCOPE MIRRORS, BLANKS, TOOLS, TESTERS, GRINDING MATERIALS, POLISHING MATERIALS, ALUMINISING, MIRROR BOX, RONCHI, LASER, FOUCAULT, ... per kilo $40AUD Tin oxide grinding powder per kilo $30AUD Pumice grinding powder per kilo $30AUD 80 Grade grinding powder per 8" mirror $2AUD 120 " " $2AUD 220 " " $3AUD 320 " " $4AUD 500 " " $6AUD 1000 ...

How I built an edge grinder for telescope mirror blanks.

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 …

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

On the opposite, a shallow mirror (e.g. F/D = 8) will be performing very well on planets and the moon. The theory behind grinding is that you can remove glass as long as you use a material with a higher hardness. Telescope makers use silicon carbide powders (a.k.a. carborundum) for this task. It is cheap and comes in various size (can range ...

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