rough grinding mirror

rough grinding mirror

  • Joy of Mirror Making: Rough Grinding BBAstroDesigns

    31 行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 pregenerated for youThe rough grinding usually digs a depression in the center of the upper disc which gradually deepens and spreads toward the edge of the disc It is a fairly simple matter, by regulating the extent of overhand, to arrange to have the curve on the mirror face reach its proper depth just as the edge of the ground out area reaches the edge of theROUGH GRINDING THE MIRROR Sidewalk Astronomers

  • Rough Grinding of a Telescope Mirror | Guy's Math &

    Rough Grinding of a Telescope Mirror 15 Monday Dec 2014 Posted by gfbrandenburg in History, Telescope Making We use both hands to make the mirror travel in a circular path in either direction for about 6 turns, grinding the center of the mirror mostly against the edge of the tool (This needs to be demonstrated!)For rough grinding a 6" mirror, about 1/2 teaspoon of grit is used per wet With finer grits, proportionately less grit is used per wet Grits in the25 micron range are often premixed with water to form a slurry, and water and grit are squirted onto the work together fromStellafane ATM: Rough Grinding

  • Stellafane ATM: Mirror Making Overview

    Rough Grinding The purpose of rough grinding is to start to cut a spherical concave surface into the mirror blank For a 6" mirror with a 48" focal length, the depth of the curve is 0047" A full sized tool is rubbed against the mirror blank, with a wet grit mixture, to abrade the glass (and also the tool, which becomes convex)1/4 λ is on the order of 0in My Son who is a qualified milspec machinist doesn't get closer than 00001in I suppose you could rough grind the tool and initial mirror shape but this will only work if you CNC router is 3DGrinding mirror using CNC router ATM, Optics and DIY

  • Grinding mirror using CNC router Page 2 ATM, Optics

    Rough grinding is but a small time period compared with the rest of what you'll need to do You can always try innovative methods on the next larger mirror With the CNC, I'd be concerned with chip damage on the edge If you are set on using the CNC machine, use it on a 6" piece of sheet steel to cut a convex curve on the metal and rough grindPreparation before grinding Throw rough grit around the rim of the mirror, wet it down, grab a piece of metal, and grind in a nice rounded bevel 1/12" wide Do this for the back side of the mirror also As grinding proceeds, maintain the bevelLarge Thin Mirror Making BBAstroDesigns

  • Fast Mirror Grinding & Polishing The ATMs Workshop

    The mirror ended up with a very smooth, zone free, nearly spherical figure ready for final figuring Figure 1: Polishing pads applied to a 9 inch grinding tool Another local ATM has also tried the polishing pads with abrasive and CeO His own 175"Gordon Waite sets up his fixedpost mirror grinding machine to begin rough grinding on an 11 f/43 telescope mirror He uses a grinding tool made from dental plaster and steel pieces to speed up grinding Gordon shows the setup for spin grinding at high speeds and with added weights toTelescope Mirror Making: Part 3, Rough Grinding

  • ROUGH GRINDING THE MIRROR Sidewalk Astronomers

    The rough grinding usually digs a depression in the center of the upper disc which gradually deepens and spreads toward the edge of the disc It is a fairly simple matter, by regulating the extent of overhand, to arrange to have the curve on the mirror face reach its proper depth just as the edge of the ground out area reaches the edge of theRough Grinding of a Telescope Mirror 15 Monday Dec 2014 Posted by gfbrandenburg in History, Telescope Making We use both hands to make the mirror travel in a circular path in either direction for about 6 turns, grinding the center of the mirror mostly against the edge of the tool (This needs to be demonstrated!)Rough Grinding of a Telescope Mirror | Guy's Math &

  • Stellafane ATM: Mirror Making Overview

    Rough Grinding The purpose of rough grinding is to start to cut a spherical concave surface into the mirror blank For a 6" mirror with a 48" focal length, the depth of the curve is 0047" A full sized tool is rubbed against the mirror blank, with a wet grit mixture, to abrade the glass (and also the tool, which becomes convex)Gordon Waite sets up his fixedpost mirror grinding machine to begin rough grinding on an 11 f/43 telescope mirror He uses a grinding tool made from dental plaster and steel pieces to speed up grinding Gordon shows the setup for spin grinding at high speeds and with added weights toTelescope Mirror Making: Part 3, Rough Grinding

  • Build your own telescope part 1: The mirror – Thomas

    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 (eg F/D = 4) well suited for deep sky observations On the opposite, aRough grinding is but a small time period compared with the rest of what you'll need to do You can always try innovative methods on the next larger mirror With the CNC, I'd be concerned with chip damage on the edge If you are set on using the CNC machine, use it on a 6" piece of sheet steel to cut a convex curve on the metal and rough grindGrinding mirror using CNC router Page 2 ATM, Optics

  • Issues with Rough Grinding ATM, Optics and DIY Forum

    Issues with Rough Grinding posted in ATM, Optics and DIY Forum: Hi, I am in the process of rough grinding a 125 diameter x 15 thick F6 mirror blank that I cast myself in a kiln and need some help/advise I am using a 9 diameter tile tool (see pic below) mounted to a patio block, 60 grit silicon carbide and spinning (TOT) at about 50 RPMThe mirror ended up with a very smooth, zone free, nearly spherical figure ready for final figuring Figure 1: Polishing pads applied to a 9 inch grinding tool Another local ATM has also tried the polishing pads with abrasive and CeO His own 175"Fast Mirror Grinding & Polishing The ATMs Workshop

  • Large Thin Mirror Making BBAstroDesigns

    Preparation before grinding Throw rough grit around the rim of the mirror, wet it down, grab a piece of metal, and grind in a nice rounded bevel 1/12" wide Do this for the back side of the mirror also As grinding proceeds, maintain the bevelPage 1 of 2 How to hold convex mirror blank for grinding? posted in ATM, Optics and DIY Forum: I obtained a mirror blank that had been previously used for grinding another mirror, so one side is convex and one side is flat Rather than hogging out the convex side, I plan to grind on the flat side But, Im trying to figure out the best way to hold the blank so it wont rockHow to hold convex mirror blank for grinding? ATM

  • ROUGH GRINDING THE MIRROR Sidewalk Astronomers

    The rough grinding usually digs a depression in the center of the upper disc which gradually deepens and spreads toward the edge of the disc It is a fairly simple matter, by regulating the extent of overhand, to arrange to have the curve on the mirror face reach its proper depth just as the edge of the ground out area reaches the edge of theA 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" mirrorIt 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 atMirror grinding scope making

  • Build your own telescope part 1: The mirror – Thomas

    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 (eg F/D = 4) well suited for deep sky observations On the opposite, aIn contrast, mirror grinding with fine abrasive wheels was achievable when appropriate parameters were chosen In this investigation, ELID II grinding with a #325 CIB–CBN wheel was used for rough grinding and the MRB–CBN wheels were utilized for finish grinding only 432 Mirror surface grinding with ELID IIIInternal mirror grinding with a metal/metal–resin bonded

  • Large Thin Mirror Making BBAstroDesigns

    Preparation before grinding Throw rough grit around the rim of the mirror, wet it down, grab a piece of metal, and grind in a nice rounded bevel 1/12" wide Do this for the back side of the mirror also As grinding proceeds, maintain the bevelThe mirror ended up with a very smooth, zone free, nearly spherical figure ready for final figuring Figure 1: Polishing pads applied to a 9 inch grinding tool Another local ATM has also tried the polishing pads with abrasive and CeO His own 175"Fast Mirror Grinding & Polishing The ATMs Workshop

  • Waite Research :: 15" F45 Telescope Mirror

    Rough polishing was a highspeed process using a fixedpost polishing machine The step is performed to rapidly remove the pits left over after fine grinding The fixedpost method leaves several zonal bands easily visible in the Ronchigram The mirror is slightly oblate, asPage 1 of 2 How to hold convex mirror blank for grinding? posted in ATM, Optics and DIY Forum: I obtained a mirror blank that had been previously used for grinding another mirror, so one side is convex and one side is flat Rather than hogging out the convex side, I plan to grind on the flat side But, Im trying to figure out the best way to hold the blank so it wont rockHow to hold convex mirror blank for grinding? ATM

  • Mirror Making Material Stathis Firstlight

    Grinding and polishing Material: Grinding and polishing compounds I have nearly always in stock A complete material set includes silicon carbide grit #80, #180, #320, Aluminum oxyde with specific flat grit shape and tight size distribution Microgrit WCA 25my, 15my, 9my, 5 my, 3 my, polishing powder CERSKX (a very fine and pure cerium oxide) and optical pitch of 28° hardnessFrom there, the lens goes through generation where the rough shape is ground into the blank A lens is then blocked and undergoes further grinding to improve the surface and shape Polishing is the final fine grinding stage where the surface and shape of the optic is finished to specificationAn Introduction to the Optics Manufacturing Process

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