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 Telpe Making" Book 1. A bowl which rotated was fitted to the spindle. I also built another machine of the same type.
want to learn more about Newtonian telpes the internet is replete with information about all types of telpes. 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. Telpe mirrors are relatively thick.
Re: Building a fixed post mirror grinding machine. Update summary: Lots of work to get to this point. Things I need to probably change or fix: My gearing of the DC motor. I will need a slow speed for polishing (5 rpm), and faster speeds for hogging out and fine grinding (15- 30 rpm), so likely need to think about adding a gear reduction.
George Willis Ritchey built this mirror grinding machine at the Yerkes Observatory in Williams Bay, Wisconsin, in the late 1890s. Under the sponsorship of George Ellery Hale, the machine was used to grind a series of telpe mirrors starting with a 24-inch and then a 60-inch mirror for a telpe initially intended for the Yerkes Observatory.
Mirrors can only be made with Special Precision Equipment in Expensive Factories or Labs; Not True! Telpe 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 …
Mirror Grinding Machine. The true test of the amateur astronomer is building their own telpe. Grinding and polishing your own mirrors is a long, arduous process. Instead of …
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. Telpe makers use silicon carbide powders (a.k.a. carborundum) for this task. It is cheap and comes in various size (can range ...
Homemade 10inch Mirror Grinding Machine.Sorry for blurred image.....
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 large wood circle will become the base of the turntable.
In addition, a great deal of money will be saved: a finished 24" scope will set you back $7,000; grinding your own mirror and building the mount yourself will cost you $2,000. Amateurs have made mirrors up to 41" by hand. A grinding machine relieves the labor, but is not necessary. A 24" is the largest you can comfortably do solo.
Document sans nom. A history of polishing machines. As often in sciences and technology, Leonardo da Vinci was a pioneer, creating machines for the production of optical devices. Indeed, between 1513 and 1517, he imagined machines to grind and polish telpe mirrors, which, at the time, were made of …
He finished the 60-inch mirror in August 1907, and in December the complete 60-inch telpe began operations. At its New68 October 2016 sky & telpe While the 60-inch was still in the grinding stage, the evermore-ambitious Hale persuaded John D. Hooker, who had made a fortune in iron and oil, to pay for a mirror blank for a 100-inch ...
Grinding,Polishing and Figuring Large Thin Mirrors - Part 2 - Polishing Astronomy, telpe 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 ...
Answer (1 of 5): The record for largest telpe made the same way amateurs use today goes to Ireland's Lord Rosse, who in 1845 built a 72-inch-telpe. Mirror grinding How the Enormous Mirrors on the World's Largest Telpe Are Made Liquid mirror telpe - Wikipedia This guy a truck d...
Currently manufacturing a 16″ diameter 1″ thick plate glass f3.88 Newtonian telpe mirror. Doing this with my new fixed post grinding machine built this summer. Work is progressing well, and very efficient. Started project in August 2013 and at this point I am ready to move on from 25 micron White Aluminum Oxide to 9 micon White Aluminum ...
The machine is shown grinding a 300 mm mirror.How to build a tachometer:
Grinding a Mirror "For it is true that astronomy, from a popular standpoint, is handicapped by the inability of the average workman to own an expensive astronomical telpe. It is also true that if an amateur starts out to build a telpe just for fun he will find, before his labors are over, that he has become seriously interested in the ...
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 …
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 ...
Astro Telmirror Grinding Machine Island. 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 telpe making book 1 a bowl which rotated was fitted to the spindle i also built another machine of the same type.
PeteDCard81, on 21 Jun 2021 - 10:11 AM, said: The Hubble primary mirror was designed to the correct specification (parameters) but ended up misshaped because of an incorrectly assembled null optics test tool. This test tool was acquired from the Perkin Elmer side of the shop that did work on Defense projects.
Mechanical assembly is complete. The machine could start grinding now. I still need to build the electronics, and then there's painting and finishing.
Mar 8, 2021 - Grinding machine for mirrors up to 42 inches [1.1m] in diameter. Can be configured for spin or stroke work.
D80F800 Telpe Primary Mirror Objective Lens Group with Secondary Mirror Newtonian Reflect Mirror Astronomical Telpe Shopping now Fast worldwide shipping. ... 800w Car polishing and waxing machine beauty tools floor electric 220V family car scratch repair glaze grinding machine;
Re: Building a fixed post mirror grinding machine. I I had a nice piece of 3/4" stainless dowel that was begging to be used. So I bought a cheap pillow block to provide the locator for the metal dowel, and then drilled the overarm to fit. These pillow blocks are $8 and come complete with a locking collar - great deal.
The I.A.U. named asteroid 17823 Bartels discovered 1998 by J.M.Roe in recognition for my contributions to amateur astronomy. Making is the Key to Knowing. A telpe mirror is arguably the most accurate surface made by human or machine. Amazingly you can grind a mirror by hand and make a telpe with simple hand tools.
Grinding Machine for Large Telpe 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 ...
Mirror Grinding Machine - posted in ATM, Optics and DIY Forum: I have some interest in building a grinding machine for possible up to an 18 mirror, but something that will also do a 6 or 8 mirror. I have plans for the Mir O Matic but would like to do something a bit more modern. I have some ideas about using a AC drive and a large aluminum disk for the turntable and have made a parts list …
Basically there are two types of grinding/polishing machine. The 'traditional' type which involves the mirror rotating at a relatively slow speed, a few rpm for a big mirror (16-20 inches) with the tool moving across the mirror, from side to side, at a higher …
Mirror-O-Matic grinding machine. When I decided in 2009 after a ten-year break to get into mirror making again, it quickly became clear to me that I would need to construct machine, as hand grinding big mirrors is not something very beneficial for the hands of a musician.
Excerpt from VHS video made at the Lick Observatory optical shops in Santa Cruz, CA before the object was acquired by the Smithsonian. Circa 1985.
Thin Telpe Mirrors . Abridged from an article appearing in Telpe Making #12 Provided: Courtesy of Astronomy Magazine Article's Author: Bob Kestner . Part I - Grinding . For many years, amateur astronomers and telpe makers thought it essential that glass for telpe primary mirrors be at least one-sixth as thick as its diameter.
The 1.3m telpe mirror blank has been completed by Peter Wangsness and is now at JP Astrocraft in Charleston, … 1.3-m Mirror Grinding Machine … Mirror-O-Matic – Dr. Debug Grinding your own telpe mirror seemed like a cool idea until I did more research and discovered all the physical …