dokas photos – how to ground your own glass,clean both the tool and the ground glass very carefully several times under a stream of water to avoid contamination and do the final grind with 3 micron powder for another hour. this is the finest of the grinding compounds. it is the last grinding grit when making a telescope lens before the polishing stage..the @stro pages - telescope making - making a tile tool,separate the tool and mirror. i have seen this happen easily in some cases and hard in others. if it sticks then simply use a utility knife around the edge between the tool and blank to.making a ceramic tile and dental plaster grinding tool for the 20' …,gordon waite demonstrates how to make a long-lasting grinding tool from dental plaster and ceramic tile. this tool is designed for hogging with very rough a....grinding tool - bad material for the tiles? - atm, optics and diy …,manual grinding with a full size tool. to build the tool, normally i use glass tiles, or ceramic tiles that are known to work well for grinding, or coins, or washers. this time, on a whim, i bought some random ceramic-looking tiles from a home improvement store..
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what follows is a set of instructions for making a cement and tile tool that can be used for the grinding process of making a telescope mirror. the tool is suitable for use with all grades of abrasive, both silicon carbide and aluminium oxide. 1..large thin mirror making,make a grinding tool from finishing plaster, hydraulic cement, casting plaster, or concrete, available at well equipped building supply houses. cover the face of the mirror with plastic wrap. build a dam on the mirror's face from cardboard 1 1/2' to 2' high..dick parker's telescope mirror workshop: cassegrain telescope …,i rough ground the f/4 curve using standard grinding techniques on a full size tool made out of porcelain tiles epoxied onto a form made of cement. after roughing in the curve, i trepanned a 2.5 inch diameter core from the back using a holesaw, with teeth ground off, and 120 grit abrasive and a standard drill press as shown on the right..tut44 making a mirror grinding tool - asterism.org,here is how to make the grinding tool. 1. trace the outline of the blank on a section of 3/4' tiles with a marker. pick out a flat face tile like the tile shown in the photo. most sheets of tile have a back webbing to hold them in a sheet. cut the tile backing material
the condensed process of making a tile tool that will be used to grind my 8.5 inch telescope mirror. making a mould around the pyrex disc, mixing and pouring....mirror grinding - telescope making,example : make 6 strokes, rotate the mirror 40 degrees clockwise, and the tool 30 degrees counterclockwise. make 7 more strokes, rotate the mirror 60 degrees clockwise, and the tool 20 degrees clockwise. don't think in degrees, nor numbers, just spin it randomly..yours for the making - grind and polish a dobsonian/newtonian …,2 pieces of glass - one will be the mirror, the other is the tool you will use to grind it. mine were plate glass 6.25' in diameter for the mirror and 5.75' in diameter for the tool, 3/4' thick. you can buy glass blanks online, in addition to other telescope making..newport glass works, ltd. grinding, polishing and figuring,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
i recommend making a separate fine grinding tool from plaster and tiles. strive to make the tool the same size as the mirror. tools larger than 20 inches are difficult to lift gently onto the mirror face. tools act roughly similar as long as they are at least 50% of the.how to build a telescope - iucaa scipop - home,briefly, the following steps are involved in making telescope grinding the primary mirror. polishing and testing the primary mirror. designing and fabricating the telescope tube, mirror cell and diagonal suport. designing and fabricating the telescope mount..manually grinding a lens - atm, optics and diy forum - cloudy …,https://en.m.wikiped...elescope_making. to make a lens you will need a spherometer, a dial micrometer, a motor-driven vertical spindle is a huge help (similar to a pottery wheel, can be made with hand tools, a shaft and a couple of bearings), and you’ll need access to a lathe eventually..an introduction to the optics manufacturing process,adhered to a polishing tool which is the inverse of the radius of optic being polishing. the tool with the pitch will be placed on the optic and rubbed together, much like the grinding process. as the polishing process continues, the pitch will slowly conform to
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 selecting a telescope, and also provides information necessary for mirror making and testing..making a tin mirror. grinding without tool. - atm, optics and diy …,the grinding and polishing of the material is no different than standard methods, grinding is same, polishing is done with 3, 1 and .5 micron compounds. i have made <10 wave optics with a very smooth surface, good enough to use in a diffraction limited system..joy of mirror making: introduction - bbastrodesigns,pounding, scraping, knapping, grinding combined with fire, heat, melting leads us today to grinding telescope mirrors from glass. making a telescope mirror is one of the most satisfying and sublime joys you will experience..making a homemade mirror grinding machine - atm, optics and …,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 questionwill 1 1/2 shaft size pillow block
i recommend making a separate fine grinding tool from plaster and tiles. strive to make the tool the same size as the mirror. tools larger than 20 inches are difficult to lift gently onto the mirror face. tools act roughly similar as long as they are at least 50% of the.stellafane atm:mirror making myths,if you want to build a telescope, you will need some simple hand tools - a hand saw, a drill, ruler, hammer and screwdriver - but nothing exotic or terribly expensive. power tools are completely optional. good, solid, useful telescopes can be built by novice amateurs. making a.making a tile tool - the atms workshop,making a grinding tool is no different. for smaller mirrors up to about 10 inches diameter, using a solid glass tool often works out best -- especially for the beginner. when attempting larger optics, however, the availability of even plate glass for a full sized tool becomes a problem..the making of a school telescope | st charles college,in order to reach the extreme smoothness required, a grinding tool is made from plaster-of-paris, with glass tiles glued on. in order to ensure that the grinding tool has the same curve as the mirror, a ‘dam wall’ of cardboard is taped around the mirror, the plaster is
start with chordal stroke to grind the mirror’s center and tool’ edge after every few minutes, turn the tool clockwise 30 degree and mirror anticlockwise 30 degree. continue grinding with at-least 12 wets once done, wash mirror and tool and inspect the mirror’s surface.mirror-o-matic mirror making machine - atm pages of berthold hamburger,the grinding/polishing tool is held in place by the quill of the m-o-m. the end of the quill is comprised of a swivel nut that fits into a socket at the back of the tool . i turn those sockets on my lathe from aluminium and usually keep several of them handy in order not to have to change the sockets during the different grinding/polishing stages..making and testing a telescope mirror - geocities.ws,the tool that i used to grind it is a circular piece of plate glass with the same diameter. i learned the basic method of grinding in sam brown's book, all about telescopes. i secured the tool with cleats on a table and placed the mirror face down on top of it with #80 silicon carbide grit and water in between.