Rough Grinding Mirror

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Joy of Mirror Making: Rough Grinding

31 lignes· 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.Rough Grinding a 20" Quartz Telescope Mirror on,07/03/2010· This video shows how to setup a mirror grinding machine for fixed-post grinding, also known as spin grinding or spinning. After setup, you'll see how abrasive and water are applied, and how the,Stellafane ATM: Rough Grinding,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 from a plastic squeeze bottle (not a

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Telescope Mirror Making: Part 3, Rough Grinding

23/09/2012· After hogging the mirror blank to depth, the rough grinding stage begins. In this video I am grinding with 60/90 grit. The wets are lasting about 90 seconds to 2 minutes.Mirror sanding - YouTube,15/06/2014· Cutting and sanding a mirror edgeRough grinding a mirror blank - YouTube,27/04/2011· Pushing glass. The initial rough grinding of a 10 inch diameter, f/5 telescope mirror blank. See updates on this project at mdpub.

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Grinding a 25-Inch F3 Telescope Mirror: Thinning

16/12/2014· 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 video explains how he ground off the excess,rough grinding - Traduction en français - exemples anglais,,A method of super-mirror finishing with electrolytic grinding for the internal surface of a small-diameter tube which comprises a rough grinding process and a mirror grinding process. Procédé de finissage superspéculaire comprenant un processus de rectification grossière etBuild your own telescope part 1: The mirror –,Whether you buy or cast your own blank, it often turns up to have rough sides with marks left from the kiln. The first thing you want to do is to flatten one side (it will become the back) by grinding it against a flat piece of glass (e.g. a old window).

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Mirror grinding - scope making

You might purchase a mirror grinding kit, and have everything you need included. If such a kit is unavailable, you need to do some scrounging. You can order a 19 mm thick disc at your local glass shop. Such glass is usually used for tabletops and window displays.Rough Grinding of a Telescope Mirror | Guy's,(Part two of my description of the essential steps in making a telescope) 2. Hogging Out means making your mirror blank have roughly the proper concave shape for the focal length or f-ratio that you want. There are many articles and web pages on this, which you really should look at! A. The math isEd Grinds a Mirror - scopereviews,Introduction: This summer (2000) I joined a mirror-grinding class hosted by our local club's ATM committee. Despite having looked through hundreds of telescopes through my observing career, I had to admit I had never ground my own mirror; in fact, my knowledge of the

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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 0.047". 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). Simple,Het slijpen, polijsten en paraboliseren van een 30 cm,,Rough grinding Fine grinding Polishing Parabolizing Inspecting and repairing the pitch lap A new pitch lap High edge problem Primary ripple A good mirror at last!! Rough grinding . 1/15, 22, 29/2005. Started with carborundum 80 MOT. After about 6 hours, mirror is reasonably spherical according to the micrometer readings and has about 4% longer,Newport Glass Works, LTD. Grinding, Polishing,Rough Grinding . Once you have the back of the mirror ground flat through 220 and the face reasonably flat, you're ready to start roughing the curve into the mirror. I recommend #60 carborundum for rough grinding. By the way, as in all optical work, be sure that you always maintain bevel on the edge of the mirror throughout grinding.

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Stellafane ATM:Mirror Making Myths

As we explain in our mirror making demonstrations at the Stellafane Convention, the basic mirror making process involves grinding the mirror blank into a sphere with desired radius of curvature for the target focal length. We then polish this sphere smooth, and then slightly alter it into a parabolic curve.Amateur Telescope Making Main Page - Stellafane,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 wonderful mechanism of our universe.Stellafane ATM: Grits, Polish & Pitch,The table below can be used as a rough guide in obtaining the grit, polish and pitch necessary for a small mirror project. Be aware that buying small quantities of is often difficult and expensive, and the first time mirror maker usually does best to purchase a mirror making kit which includes the necessary set of abrasives and pitch. Also be,

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tut44 Making A Mirror Grinding Tool - Asterism

Making A Mirror Grinding Tool By Allen Malsburry The average person would never think, “I can make my own telescope.” Most amateur astronomers believe, “I can buy a betterCasting a Large, Light-Weight Telescope Mirror,Casting a Large, Light-Weight Telescope Mirror From Recycled Glass: The first photo below shows a 12.5 inch diameter, 1.5 inch thick, telescope mirror blank, made from recycled glass, that has been lightened by casting the mirror in a mold that made lots of hexagon-shaped pockets in the back of the mirror…Making my own fixed post mirror,15/10/2012· 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? Would

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ROUGH GRINDING THE MIRROR - Sidewalk

ROUGH GRINDING THE MIRROR. The heart of the Newtonian telescope is the comparatively long focus, parabolic mirror called the objective. It gathers light from the object and forms an image of the object in the focal plane at the eyepiece.Mirror-o-Matic mirror making machine - ATM,Mirror-O-Matic grinding machine. When I decided in 2009 after a ten-year break to get into mirror making again, it quickly became clear to me that I would need to construct machine, as hand grinding big mirrors is not something very beneficial for the hands of a musician.Joy of Mirror Making: Introduction,Rough Grinding. Unless the mirror comes pre-generated, the initial curve will have to be ground into the mirror. A ring tool of half the diameter of the mirror used on top of the mirror's flat face with the coarsest grit will rapidly grind a spherical curve into the mirror. Grinding a 6 inch [15cm] mirror to F/2.8 using a ring tool. Mirror,

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Joy of Mirror Making: Fine Grinding - BBAstroDesigns

The goals of fine grinding are to prepare the curved mirror face so that it is ready for polishing and figuring and make any adjustments of the focal length. Previously in rough grinding we deepened the center of the mirror's face either by grinding with coarse grit and a tool, slumping in a kiln over a mold, or purchasing the glass pre-generated.Joy of Mirror Making: Rough Grinding | Telescope,,Jan 23, 2019 - This Pin was discovered by Edward. Discover (and save!) your own Pins on PinterestHow I make Telescope Mirror Blanks - mdpub,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 horribly wrong during the grinding and polishing operations. I'll post an update once a mirror is completed.

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Rough grinding | Article about rough grinding by

I remember hearing famed telescope guru John Dobson proclaim, "Mirror making is caveman work--eat well, sleep well, and work like hell!" And there's little doubt that the most caveman-like part of the process is rough grinding.That's the stage in which you carve the initial curve into the surface of a glass blank.Making a Mirror grinding & Polishing machine,16/03/2015· Page 1 of 5 - Making a Mirror grinding & Polishing machine - posted in ATM, Optics and DIY Forum: Hello, I am on the half of the way to make a mirror grinding machine inspired by original M-O-M design. I made the pulley arrangement such a way that, both the turn table & eccentric spins at 50 RPM fixed. I wont go for making mirror bigger that 10.5 (or max 12). Please help me. Is it okay toHelp ! rough grinding 16" mirror - ATM, Optics,13/07/2014· Do you plan to use a full size tool for fine grinding? If so, you could probably alternate tool on top and mirror on top with the full size tool and coarse grit to keep the sag the same but wear the mirror down until the curve meets the edge. Sounds like something that would take a long time... but I suppose nothing comes quickly in mirror making.

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Surface finishing - Wikipedia

Also known as grinding, roughing or rough grinding. These finishes are coarse in nature and usually are a preliminary finish applied before manufacturing. An example would be grinding gates off of castings, deburring or removing excess weld material. It is coarse in appearance and applied by using 36–100 grit abrasive.rough grinding - definition - English - Glosbe,In the rough grinding process, an electrode tool (14) for rough finishing having non-woven nylon fabric wound around a core electrode (15) thereof is used, wherein electrolytic grinding is applied to the inner surface of a small-diameter tube (10) with a minute electric current supplied through an electrolytic solution and is continued until the roughness of the inner surface of the tube is,Telescope Making, Rough Grinding a 12.5 inch,May 30, 2012 - Telescope Making, Rough Grinding a 12.5 inch primary mirror. May 30, 2012 - Telescope Making, Rough Grinding a 12.5 inch primary mirror. Stay safe and healthy. Please practice hand-washing and social distancing, and check out our resources for adapting to

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Polishing (metalworking) - Wikipedia

Process. The condition of the material at hand determines what type of abrasive will be applied. The first stage, if the material is unfinished, starts with a rough abrasive (perhaps 60 or 80 grit) and each subsequent stage uses a finer abrasive, such as 120, 180, 220/240, 320, 400 and higher grit abrasives, until the desired finish is achieved.Telescope Mirror Making Guide - Rough Grinding,WARNING: During all stages of mirror making (including grinding, smoothing, polishing, and beveling) keep your mirror, tool, pitch lap, grit, abrasives and polish wet to prevent glass particles from becoming airborne as you work. Failing to do so can cause long-term damage to your lungs. Overview. Rough grinding is the first stage of work in making your telescope mirror.Rough Grinding - chestofbooks,I omitted it once, with the result that when the rough-grinding was nearly complete and I was lifting the mirror off the tool, I had the mortification of seeing it drop on a brick floor from a height of some four feet and, of course, on the "buttered side ". Result, a chip 2 in. square out of the face and a new disc required. If, however, the,

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How I built an edge grinder for telescope mirror

I have been casting my own telescope mirror blanks for a few years now. How I do it is explained elsewhere on this web site. The casting process leaves the blanks slightly oversize, and the edges of the blanks rough, and not quite perfectly round.How I Make Light-Weight Hexagon or Honeycomb,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 hard to believe, but the rough grinding has removed over a pound of glass. The mirror now weighs in at only only 8 pounds 15,Custom Stainless Steel Polishing Services in China-,In other cases, a grinding pad will be first attached to the grinder to remove any excess bits of stainless steel. This grinding pads must, however, be used in the proper sequence, with respect to the grit, which gives a measure of how smooth or rough the abrasive or grinding surface is.

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Grinding me first mirror 12.5" x .75" plate glass

28/04/2018· Page 1 of 5 - Grinding me first mirror 12.5" x .75" plate glass - posted in ATM, Optics and DIY Forum: Just started grinding my first mirror today. Had been wanting to for a long time and finally just had to see how well I could do. Was able to get just about everything I needed from GotGrit. I bought the grinding kit, plus some extra SiC and WaO just Incase for whatever reason I needed it,,,

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