A telescope mirror is designed to form a diffraction limited image of a point source. Ideally, a certain percentage of the light in the image will fall within the diffraction disk diameter. The Strehl ratio compares the mirror's actual performance in terms of its ability to …
The November 1974 issue of Sky & Telescope (page 325) carried an article by Eric G.H. Mobsby of Blandford Forum, Dorset, England, describing a method of testing medium and long focus mirrors with a special inverse grating that can be interpreted with the ease of a Null Test. Robert A. Cox, then Co-editor of the Gleanings for ATM's column ...
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 telescope mirrors, which, at the time, were made of bronze.
Telescope Mirror coating - recoating - aluminising, telescope mirror blanks, polishing, grinding and pitch supplies. ... We offer a range of products and services for the ameteur telescope enthusiast such as grinding powders, polishing powders /compounds, telescope aluminising services.
(3) A homemade telescope mirror can be made with more accuracy and smoothness than the mass-produced, commercial mirrors available today. Unfortunately, the cost of mirror grinding kits and pyrex blanks has increased significantly in recent years to the point where any savings from making a mirror versus buying one are minimal at best.
Telescope Mirror Blanks Providing telescope mirror blanks and kits to telescope makers. Mirror blanks are individually tested for internal strain. Plastic protractor inserted under a 6 inch mirror blank during a stress test, to illustrate what stress would look like - if there were any present.
A telescope mirror is designed to form a diffraction limited image of a point source. Ideally, a certain percentage of the light in the image will fall within the diffraction disk diameter. The Strehl ratio compares the mirror's actual performance in terms of its ability to …
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 ...
Rough grinding powders for grinding mirrors to the required curve starting with flat (non diamond generated) mirror blank and grinding tool. Three grades of coarse grinding powders are listed below. ... ( CATS) telescope making group. Here is a link to the 'Sky at Night' magazine's Telscope Making Video by two members of CATS.
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 ...
Rough grinding powders for grinding mirrors to the required curve starting with flat (non diamond generated) mirror blank and grinding tool. Three grades of coarse grinding powders are listed below. ... ( CATS) telescope making group. Here is a link to the 'Sky at Night' magazine's Telscope Making Video by two members of CATS.
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.
Rough Grinding The first milestone is putting a curve into the mirror face. The curve's depth dictates the mirror's focal length. The curve should be spherical. Creating the curve can be done by several methods: The curve is ground into the mirror face using a grinding tool. The curve is pre-generated for you.
Here at OPT, we know how long and complex a process it can be to hand pick every single component of your astronomy setup to go perfectly with your telescope. Thats why we offer a wide variety of telescope kits to do the hard work for you! We have a wide array of pre-prepared kits available for use, centered around various high quality telescopes.
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 ...
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.
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
Construction and Design. Parsons improved the techniques of casting, grinding and polishing large telescope mirrors from speculum metal, and constructed steam-powered grinding machines for parabolic mirrors.His 3 feet (91 cm) mirror of 1839 was cast in smaller pieces, fitted together before grinding and polishing; its 1840 successor was cast in a single piece.
This is photos on the Mirror Griding Machine I have built. The tool I built is called M-O-M-20. This is a photo of a 20 inch mirror being ground.
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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.
Primary Mirror Dimensions. Primary Mirror type. Focal length nominal mm. Edge thickness mm * Diameter mm. Weight g. Ultrascope 150 f4. 600. 18. 151. 745. 150 f5. 750 ...
mirror grinding machine design. mirror grinding machine design Mirror Grinding Machine - ATM, Optics and DIY Forum,- mirror grinding machine design,This image shows the 3D model of the overarm assembly I added to my small spin-post grinding machine (I'm building a bigger one now based on the same basic overarm design) In the one shown, the overarm is,..
Telescopes Mirror Grinding Equipment. Telescopes Mirror Grinding Equipment We are a largescale manufacturer specializing in producing various mining machines including different types of sand and gravel equipment milling equipment mineral processing equipment and building materials equipment…
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.
Jul 28, 2016 - Explore optixwiz's board "Telescope Makers", followed by 230 people on Pinterest. See more ideas about Telescope, Telescopes, Amateur astronomy.
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Mel Bartels, a well respected west coast amateur, recommends on his Large, Thin Mirror Grinding web page starting with something between 30 and 60 grit, and then 120, 220, 500 (=25 micron) and finishing with 9 micron. This is just a 5 grit sequence, as opposed to 8 to 10 for the more traditional sequences usually recommended for novices.
