VolPort, the leading enterprise of Chinese crushing and grinding industries, has always been dedicated to the development of ore crushers, sand-making machines and industrial grinders in the past 30 years.
In conventional telescope mirror grinding standards it is required to maintain thickness to diameter ratio greater than 1/6. Mirrors with the ratio less than 1/6 are considered as thin mirrors. Mirror blanks are selected considering this factor which
Just grinding the telescope mirror probably took 80-100 hours for me, but I was learning a lot and taking my time. ... One can cut the Hartmann mask laboriously out of thin card. The ultimate test is the Bath interferometric test, but it's a little …
Steps for Telescope Mirror Coating. Step 1: Strip the old coating. Step 2: Prepare the praying chemical mixture. Step 3: Clean the mirror. Step 4: Sensitize the mirror surface. Step 5: Spray the mirror surface with the silvering mixture. Step 6: …
This is the second part in the series, showing fine grinding in a step by step tutorial. In this video I am showing you how to make a DIY telescope mirror! This is the second part in the series ...
Got Grit Supplies inexpensive grinding and polishing materials, as well as thin mirror blanks. Salem Distributing Co. Supplier of mirror grinding and polishing materials, including Microgrit and Gugolz pitch. Newport Glass This site provides kits and materials for making small and large mirrors. Kit prices are expensive.
Thin Telescope Mirrors . Part 2 - Polishing . Abridged from an article appearing in Telescope Making #13 Provided: Courtesy of Astronomy Magazine Article's Author: Bob Kestner . I am going to start with some additions to topics covered in part 1, on grinding mirrors.
Hence, reduction of the mirror thickness is an important factor in a telescope design. Thin mirror allows reduction in weight thereby reducing the weight and consequently the cost of the instrument. In this research a 0.25 m diameter f/10 parabolic telescope mirror was fabricated from 0.012 m thickness glass plate.
September 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 lapping the blank by ...
Oct 6, 2017 - telescope making, mirror grinding, homemade tripod, eyepieces, astronomy. Oct 6, 2017 - telescope making, mirror grinding, homemade tripod, eyepieces, astronomy. Pinterest. Today. Explore. When autocomplete results are available use up and down arrows to review and enter to select. Touch device users, explore by touch or with ...
The Stellafane Convention is a gathering of amateur telescope makers. The Convention was started in 1926 to give amateur telescope makers an opportunity to gather to show off their creations and teach each other telescope making and mirror-grinding techniques. All telescopes, commercial and homemade, are welcome.
Now that I have several blanks made, it is time to grind and polish one into a telescope mirror and test it out. I can use one blank as the mirror and another as the grinding tool, and have a couple in reserve in case something goes …
Telescope mirrors can be made in your kitchen … to get an accurate surface on a mirror – most machines … mirror making process involves grinding the mirror … Large Thin Mirror Making – Mel Bartels, BBAstroDesigns homepage
Most amateur telescope makers (ATMs) build a Newtonian telescope, a design named for its inventor, Sir Isaac Newton. The heart of the Newtonian telescope is its primary mirror. Most Newtonian primary mirrors have either a spherical or a parabolic shaped concave face. Unlike most other mirrors in your home, the mirror coating of a
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! This vid...
The test is very simple. Rinse and wipe the mirror dry. Draw a grid on the mirror surface with a permanent marker (<--picture) Add the usual half teaspoon of grit, sprinkle with water and grind for a couple of minutes, rotating tool and mirror …
Any mirror that is less than 6:1 thick is referred to as a thin mirror. Thin mirrors cost slightly less, weigh less, and cool down quicker. But they are much more susceptible to problems with ground in astigmatism and distortion due to …
Begin grinding concentrating by focusing the center of the mirror to the edge of the tool. However, when having a mirror ground face up, consider using a smaller instrument that is less than or equal to 75% of the mirror diameter. Seventh Phase: Fine Grinding Fine grinding is well known for its long process of grinding.
For large thin mirrors, say 12 inches [30cm] or greater and 1.5 inches [4cm] or thinner, the mirror back must be ground flat, or at least regular in shape before beginning fine grinding the mirror's face. Cast a tool specifically for the mirror's back, and grind with 220 grit, inspecting for low unground spots. Grind until they disappear.
PDF | On Apr 24, 2018, Dhanushka Subath and others published Study of thin telescopic mirror fabrication and mirror cell optimization | Find, read and cite all the research you need on ResearchGate
The master craftsman, Roger Angel, who has been making telescope mirrors for 30 years, or its the technicians arranging— arranging not simply throwing into the mold—chunks of glass (pictured above), or those grinding and polishing the mirror, success depends on just knowing when you've done it right.
Webb's Mirrors. James Webb Space Telescope's primary mirror at NASA Goddard. The secondary mirror is the round mirror located at the end of the long booms, which are folded into their launch configuration. Webb's mirrors are covered in a microscopically thin layer of gold, which optimizes them for reflecting infrared light, which is the primary ...
Telescope Formulas and Design Comparator. This page has formulas for many telescope and mirror parameters. It will calculate parameters for two different telescope designs and compare the results for you. It provides data to help in …
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 …
Grinding and Polishing a Meniscus Mirror. ATM. In many respects, the grinding and polishing stages of fabricating a thin meniscus telescope mirror are not different from any telescope mirror. There are lots …
Rough grinding is complete for the 12.5 inch honeycomb-back telescope mirror blank. The rough grinding went pretty quickly and painlessly this time. I only have maybe 12 hours of actual work in the mirror so far. It's …
How do you polish a mirror on a telescope? Place the mirror face-up on a towel and, with the drain open, spray the mirror's surface with room-temperature water for a few minutes to remove any lingering residue. The majority of dust and grit …
Gordon Waite shows some steps during fine grinding of the 20" mirror. As the grind progresses through the grades of abrasives, see the technique Gordon uses...
Answer (1 of 2): Telescope mirrors in the modern era are usually made from glass covered by a thin metal film, usually aluminum. Glass is stable and can be polished to a high degree. The best glass for mirrors is likely to be one which has a very …
Conical mirrors in 6, 8, 10, 12.5, 14.5 and 16 inch sizes. Go here for details. My mirrors are made to the following design and use specifications. Wavefront accuracy having an RMS of .032 and a Strehl Ratio of .96 or better at 633 nm …
By Nathan Hurst. 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 …
When grinding thin mirror blanks, be conscious of downward pressure, which if excessive, may bend the mirror blank momentarily out of shape. While this is not a problem during rough grinding (as the amount of flex is exceedingly small) the effect becomes important as you reach the later stages of making your telescope mirror.
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...
There are several advantages to using thin plate glass mirror blanks for grinding your telescope mirror: * Thin mirror blanks are less expensive, allowing more people to afford the hobby of grinding their own telescope mirror. * Choosing a thin mirror blank gets you more aperture for your dollar.
6 Inch Telescope Mirror Blank. $59.95. Add to Cart. Add to Wish List Add to Compare. 8 Inch Telescope Mirror Blank. $169.00. Add to Cart. Add to Wish List Add to Compare. 10 Inch Telescope Mirror Blank.
Telescope Mirrors, Blanks, Secondaries, Grinding Materials, Testers, Aluminising, Making Advice Information. ... Fused silica between thin blanks supports the mirror and also keeps the weight to a minimum. ... per kilo $40AUD Tin oxide grinding powder per kilo $30AUD Pumice grinding powder per kilo $30AUD 80 Grade grinding powder per 8" mirror ...
We recommend Pyrex over plate glass simply because it is much easier to build your first mirror with pyrex. The low coefficient of expansion of Pyrex makes a difference during the grinding process. Plate Glass, particularly thin blanks, can be warped by the warmth of your hand, expandings the glass into the tool, and grinds unevenly.
Telescope Mirrors, Blanks, Secondaries, Grinding Materials, Testers, Aluminising, Making Advice Information. ... Fused silica between thin blanks supports the mirror and also keeps the weight to a minimum. ... per kilo $40AUD Tin oxide grinding powder per kilo $30AUD Pumice grinding powder per kilo $30AUD 80 Grade grinding powder per 8" mirror ...
