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telescope mirror grinding machine plans

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

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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

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Mike's Telescope Workshop

I finally decided it was time to build a machine to help me grind the edges of the blanks true and round. This is my home-built edge grinding machine for grinding down my home-cast mirror blanks. Click to see the whole project. This is a 12.5 inch diameter, 1.5 inch thick, light-weight honeycomb-back telescope mirror blank that I made myself.

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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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Astro-Tel - Mirror grinding machine

MIRROR GRINDING MACHINE. I made my first mirror grinding and polishing machine over thirty years ago. It used the working principle of the machine illustrated at "A" Fig.3, Page 163, "Amateur Telescope Making" Book 1. A bowl which rotated was fitted to the spindle. I also built another machine of the same type.

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grinding / polishing machine for telescope mirrors ...

Sep 29, 2014  Mechanical assembly is complete. The machine could start grinding now. I still need to build the electronics, and then there's painting and finishing.

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Mirror grinding - Telescope 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 ...

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

Mar 06, 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 question ...will 1 1/2 shaft size pillow block bearings work good for a homemade EQ mount? Thank you , John

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Making mirrors for giant telescopes - SPIE Digital Library

The Starfire project provided much of the funding for a new polishing lab built in 1990 and equipped with an 8 m grinding and polishing machine and a 24 m test tower, which were first used to figure the 3.5 m mirrors. The Mirror Lab was not free to choose the focal ratios, so these mirrors were more conservative at f/1.5 – f/1.75.

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jeffbaldwin

Fixed-post machine grinding is where the mirror is on a turntable rotating around 20 PRM [speeds vary], and a 75% tool is on top. They are already curve-generated. The tool is hanging over the mirror by 1/6 the diameter of the tool, or about 1/8 diameter of the mirror, and is fixed in this position.

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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 abrasiv...

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Astro-Tel - Mirror grinding machine

MIRROR GRINDING MACHINE. I made my first mirror grinding and polishing machine over thirty years ago. It used the working principle of the machine illustrated at "A" Fig.3, Page 163, "Amateur Telescope Making" Book 1. A bowl which rotated was fitted to the spindle. I also built another machine of the same type.

More

Telescope Making Links - Designs and Techniques STAR ...

Astronomy, telescope making ,mirror grinding and testing. Large Thin Mirror Making by Mel Bartels. Grinding Machines. Mirror-o-matic. Tom Waineo's Desktop Grinding/Polishing Machine. Ken Lilja's Grinding Machine. Grinding Machine.

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How I built an edge grinder for telescope mirror blanks.

I borrowed a few ideas from the Mirror-O-Matic mirror grinding machine, particularly how to mount the turntable on top of the pulley. Anyone building machinery for cold-working glass should have a look at the MOM web site and plans. There are lots of good ideas there. The

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Grinding Machine for Large Telescope Mirrors

Grinding Machine for Large Telescope Mirrors. I designed and built a grinding machine for mirrors up to 42 inches [1.1m] in diameter. By slipping on and off a couple of belts, the machine can quickly be reconfigured for spinning work or for stroking work. The machine can also work smaller mirrors if the drip pan is moved to the fast shaft on ...

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Building a fixed post mirror grinding machine ...

Aug 19, 2019  Gordon Waite is probably one of the better mirror makers using this machine and have incorporated some of his ideas into my plan. I like the fixed-post plan vs others with eccentric drives, because it gets the heavy grinding done in an automated

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Newport Glass Works, LTD. Grinding, Polishing and Figuring ...

Thin Telescope Mirrors . Abridged from an article appearing in Telescope Making #12 Provided: Courtesy of Astronomy Magazine Article's Author: Bob Kestner . Part I - Grinding . For many years, amateur astronomers and telescope makers thought it essential that glass for telescope primary mirrors be at least one-sixth as thick as its diameter.

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Making mirrors for giant telescopes - SPIE Digital Library

The Starfire project provided much of the funding for a new polishing lab built in 1990 and equipped with an 8 m grinding and polishing machine and a 24 m test tower, which were first used to figure the 3.5 m mirrors. The Mirror Lab was not free to choose the focal ratios, so these mirrors were more conservative at f/1.5 – f/1.75.

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Fixed post mirror grinder advice - DIY Astronomer ...

Nov 01, 2011  Hi AllWeve been having some idle discussions about grinding mirrors here. In particular, weve been discussing building a fixed post mirror grinding turntable for cutting mirrors up to about a 24inch diameter to spherical. Its only a pipe dream at the

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jeffbaldwin

Fixed-post machine grinding is where the mirror is on a turntable rotating around 20 PRM [speeds vary], and a 75% tool is on top. They are already curve-generated. The tool is hanging over the mirror by 1/6 the diameter of the tool, or about 1/8 diameter of the mirror, and is fixed in this position.

More

Telescope Making Links - Designs and Techniques STAR ...

Grinding,Polishing and Figuring Large Thin Mirrors - Part 2 - Polishing Astronomy, telescope making ,mirror grinding and testing Large Thin Mirror Making by Mel Bartels Grinding Machines Mirror-o-matic Tom Waineo's Desktop Grinding/Polishing Machine Ken Lilja's Grinding Machine Grinding Machine Figuring Figuring a Paraboidal mirror by thermal ...

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Telescope Making Supplies

Throughout the grinding and final lapping stages, the objective has been to reduce pits and scratches to the smallest possible size. However, no amount of grinding can produce a surface smooth enough or sufficiently transparent to meet the needs of a first-class telescope objective. Different techniques are

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Joy of Mirror Making: Polishing - BBAstroDesigns

Polishing a mirror is one of the great joys you will experience as a maker and builder. It's also arguably the most accurate surface made by man or machine. If the mirror is expanded to the size of a football field, then the mirror’s surface will be smooth to 1/1000 inch or 1/30 millimeter!

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Mirror-O-Matic

Oct 17, 2009  I decided to try my hand at grinding an polishing my own mirror. Before I took the plunge of buying glass I wanted to see if I could build the required devices needed to grind, polish, and test a mirror. Build a Ronchi / foucault tester. Build a machine to grind the mirror ( AKA mirror-o-matic

More

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 abrasiv...

More

Telescope Making Links - Designs and Techniques STAR ...

Astronomy, telescope making ,mirror grinding and testing. Large Thin Mirror Making by Mel Bartels. Grinding Machines. Mirror-o-matic. Tom Waineo's Desktop Grinding/Polishing Machine. Ken Lilja's Grinding Machine. Grinding Machine.

More

How I built an edge grinder for telescope mirror blanks.

I borrowed a few ideas from the Mirror-O-Matic mirror grinding machine, particularly how to mount the turntable on top of the pulley. Anyone building machinery for cold-working glass should have a look at the MOM web site and plans. There are lots of good ideas there. The

More

Grinding Machine for Large Telescope Mirrors

Grinding Machine for Large Telescope Mirrors. I designed and built a grinding machine for mirrors up to 42 inches [1.1m] in diameter. By slipping on and off a couple of belts, the machine can quickly be reconfigured for spinning work or for stroking work. The machine can also work smaller mirrors if the drip pan is moved to the fast shaft on ...

More

Making a Mirror. - Astronomy

Grinding/polishing machines work by rotating the bottom piece (mirror or tool) and letting the top piece freely rotate about it's central axis as it desires to do. As you watch a machine work, the upper piece will rotate at about 1/2 to 1/10 the speed of the bottom piece.

More

Making mirrors for giant telescopes - SPIE Digital Library

The Starfire project provided much of the funding for a new polishing lab built in 1990 and equipped with an 8 m grinding and polishing machine and a 24 m test tower, which were first used to figure the 3.5 m mirrors. The Mirror Lab was not free to choose the focal ratios, so these mirrors were more conservative at f/1.5 – f/1.75.

More

Building a fixed post mirror grinding machine ...

Aug 19, 2019  Gordon Waite is probably one of the better mirror makers using this machine and have incorporated some of his ideas into my plan. I like the fixed-post plan vs others with eccentric drives, because it gets the heavy grinding done in an automated

More

Mirror-O-Matic

Oct 17, 2009  I decided to try my hand at grinding an polishing my own mirror. Before I took the plunge of buying glass I wanted to see if I could build the required devices needed to grind, polish, and test a mirror. Build a Ronchi / foucault tester. Build a machine to grind the mirror ( AKA mirror-o-matic

More

Astronomy Options Astronomy, Mirror Making, Telescopes ...

Currently manufacturing a 16″ diameter 1″ thick plate glass f3.88 Newtonian telescope mirror. Doing this with my new fixed post grinding machine built this summer. Work is progressing well, and very efficient.

More

Telescope Making Supplies

Throughout the grinding and final lapping stages, the objective has been to reduce pits and scratches to the smallest possible size. However, no amount of grinding can produce a surface smooth enough or sufficiently transparent to meet the needs of a first-class telescope objective. Different techniques are

More

How to Aluminize Telescope Mirrors - YouTube

Ensure you enable subtitles (click on "CC" bottom-right) to help where the sound is not audible.Modern optical telescope use mirrors and very few lenses.Unli...

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

TELESCOPE MIRROR MAKING BOOKS Advanced Telescope Making Techniques Volume 1 Volume 2 $60AUD Amateur Telescope Making Volume 1, 2 3 $70AUD Build Your Own Telescope Complete plans for 5 high quality telescopes $70AUD The Dobsonian Telescope A practical manual for building large aperture telecopes $82AUD How To Make a Telescope 2nd Edition ...

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GRINDING A TELESCOPE REFLECTOR WITH TOOL

Grinding telescope reflectors of 15-inch diameter and over makes it necessary to employ a motor-driven turntable. Small mirrors are generally ground and polished by rotating the tool, fastened to the turntable, and working the mirror blank by hand either in straight or in circular strokes over the tool. In this case the overhang of the mirror ...

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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 mirror on a 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.

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