Apr 29, 2017 telescopes and amateur telescope making articles by Mel Bartels. Mel Bartels' Amateur Telescope Making. Grinding twin 30 inch 76cm F2.8 mirrors https Grinding machine. Precision molds for mirrors. McHardie's 'Preparation of Mirrors' 16 inch mirror figuring class. Chat Online Lens Grinding and PolishingYouTube.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.
Apr 09, 2013 Large-aperture telescopes use multiple segmented mirrors, which require grinding and polishing to achieve a specific surface-form. There is growing demand worldwide for high-precision, nanometer-level control of surfaces to manufacture these mirrors on an increasing scale. However, current production processes are slow.Oct 15, 2012 Page 1 of 2 - Making my own fixed post mirror grinding polishing machine - posted in ATM, Optics and DIY Forum Hey guys. Im thinking of making my own fixed post mirror grinding polishing and curve generating machine. Ive got loads of questions regarding the design so Ill just start firing away Do I need an eccentric moving tool to be able to polish a mirror spherical.
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.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.
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 telescope mirrors starting with a 24-inch and then a 60-inch mirror for a telescope initially intended for the Yerkes Observatory.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.
All our Mirror Kits contain a Pilkington Float Glass mirror blank and Grinding Tool. These arefinished with fine ground edges. 180 grade first stage ginding powder. 400 grade ginding powder. 303 grade smoothing powder. Top quality Cerium Oxide Polishing powder.Nov 16, 2018 Types of mirror grinding machines - posted in ATM, Optics and DIY Forum Hi to all, I am planning to make a mirror grinding and polishing machine but i have limited knowledge about these machines. Because of this i have some questions to someone who has some experience with those machines - Some machines have fixed supportes and some of them have a prestaltic moving arm,.
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 than the mirror blank and a second piece of glass (called the tool) to rub the mirror.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 conservative at f 1.5 – f 1.75.
Telescope Making. Telescope Mirror Grinding and Polishing Machine. After I had made the 41-cm telescope mirror by hand I had decided that I needed a grinding and polishing machine for the bigger mirrors I wanted to make. Specification. The machine must fullfill the following needs It must be as compact as possible.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 telescope mirror is arguably the most accurate surface made by human or machine. Amazingly you can grind a mirror by hand and make a telescope with simple hand tools.
Large Mirror Making •For many years the standard amateur mirror was 6 inches in diameter with a focal length of 48 inches. •This is a very modest mirror by today's standards when 20 inch (0.5m) mirrors are commonplace and advanced amateurs are creating 40-inch mirrors and planning larger. •There is the current AltAzInitiative where.Feb 14, 2016 When making a telescope mirror on the machine, two parameters are important the rotation speed of the mirror, and the rotation speed of the overarm eccentric. Other environmental parameters also matter temperature and humidity are foremost here.
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.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. 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.
This listing is for a telescope mirror grinding machine and supplies. Specifically it is called a fixed post grinding machine , made popular by the YouTube videos of Gordon Waite. Basically, it's a heavy turntable, driven by a Browning speed reducer and a direct current, variable speed motor, with a fixed post for the grinding tool, all riding.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 telescope. It is also true that if an amateur starts out to build a telescope just for fun he will find, before his labors are over, that he has become seriously interested in the.
Sep 26, 2006 The true test of the amateur astronomer is building their own telescope. Grinding and polishing your own mirrors is a long, arduous process. Instead of.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!.
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.You'll want to first determine the shape of your mirror and the focal length that it will eventually have. When designing a telescope of this style, there is a very, very handy tool called Newt for the Web.You can put in your mirror diameters for the one we'll be making (primary mirror) and the secondary mirror, as well as the focal length of the primary mirror, and it will give you a lot of.
This object is on display in the Space Science at the Steven F. Udvar-Hazy Center in Chantilly, VA. 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.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.
- Myron Emerson's Amateur Telescope Mirror Making - GAP 47's machines summary - David Harbour's Understanding Foucault - Albert Highne's Portable Newtonian Telescopes - Neale E. Howard's Standard Handbook for Telescope Making - Albert G. Ingall's Amateur Telescope Making, Volumes 1-3 - H. Dennis Taylor's The Adjustment and Testing of Telescope.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.
Nov 01, 2011 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 rpm depending on the size of the mirror.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.