mirror grinding casting

How I built an edge grinder for telescope mirror blanks.

2013-2-26 · Here is a photo of the grinder in operation actually edging a 12.5 inch blank I cast in my kiln. It works! The blank is attached to the 12 inch diameter wood disk with industrial strength, adhesive-backed Velcro. The rough grinding drum very quickly got the edge trued up and round and to the correct diameter with a minimum of effort and drama.

mirror grinding kit grind and polish ...

All our Mirror Kits contain a Pilkington Float Glass mirror blank and Grinding Tool. These arefinished with fine ground edges. 180 grade first stage ginding powder. 400 grade ginding powder. 303 grade smoothing powder. Top quality Cerium Oxide Polishing …

How I make Telescope Mirror Blanks

2012-3-19 · Here is a stack of my home-made 8 and 10 inch mirror blanks. The second from the bottom is the one above. I can use the thinner blank below it as the grinding tool. UPDATE I have started rough grinding one of my home-made 10in glass blanks. Here …

Internal mirror grinding with a metal/metal–resin bonded ...

2001-1-1 · Mirror internal surface grinding is practicable on ordinary grinding machines using CIB–CBN wheels with electrolytic interval dressing (ELID II). 3. ELID III grinding with MRB–CBN wheels can be carried out, and mirror finishes can be achieved using a standard machine tool, when appropriate grinding parameters and electrical parameters are ...

HIGHYOND China Investment Casting ...

Highyond Investment Casting is located in Dongying, China and the company has 210 employees and the monthly production capacity is 100 tons. We use Silica sol investment casting and produce a wide variety of high-grade precision casting and machined parts, in stainless steel, heat-resistant steel, carbon steel, low alloy steel, high temperature alloys, nonferrous alloys and other materials.

Joy of Mirror Making: Rough Grinding

2020-5-19 · I use an old printer stand. Here is a 25 inch [635cm] mirror being rough ground followed by a beautiful grinding stand from the Delmarva Mirror Making Seminar. Grinding Tools. To construct a grinding tool, attach unglazed ceramic tiles, 1 inch [2.5cm] square, to one of these substrates: Hydrostone gypsum cement; Casting building plaster; Concrete

Joy of Mirror Making: Fine Grinding

2017-4-4 · 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 …

Precision mirror grinding and machining of steel-bonded ...

2020-12-5 · On-line electrolytic dressing mirror grinding is a new ultra-precision machining technology developed in Japan in the early 1990s. It uses cast iron or iron fiber bond diamond or CBN grinding wheel to perform on-line electrolytic sharpening …

Mirror Lab

Segment 5 was cast on November 4, 2017. The mirror was cleaned out and moved into the integration hall in 2019, awaiting its turn on the grinding machines. GMT Segment 4 . As of July 2019, Segment 4 has completed rear surface polishing and load spreaders are being attached.

Lens & Mirror Making Best lenses and mirrors are ...

2010-12-2 · Lens & Mirror Making • Best lenses and mirrors are both made by grinding the surface • Start with a mirror or lens blank • For mirrors only surface needs to be good • Typical mirror want pyrex (eg BK7) • Then need a tool blank – poorer glass & softer glass • Place mirror on top tool

Grinding and Polishing

2013-11-24 · Grinding uses fixed abrasives—the abrasive particles are bonded to the paper or platen—for fast stock removal. Polishing uses free abrasives on a cloth; that is, the abrasive particles are suspended in a lubricant and can roll or slide across the cloth and specimen. A book edited by Marinescu et

Mirror grinding

2007-2-13 · A 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" mirror is cheaper, it is …

Mirror Surface Grinding of Silicon Wafers ...

1990-1-1 · Mirror Surface Grinding of Silicon Wafers with Electrolytic In-Process Dressing H. Ohmori, T. Nakagawa (1); Institute of Industrial Science, University of Tokyo Received on January 24,1990 SUMllARY:The authors have studied finish grinding techniques.and succeeded in developing a new grinding technique that realises mirror quality surfaces.

First time mirror grinding 8" f/5

 · When fine grinding is complete, cast a plaster tool on the mirror for the pitch lap. Don''t use the grinding tool for your pitch lap. Be sure the tool for the lap is made fully the diameter of the mirror. Making the pitch lap as large as the mirror surface is important for ease of getting a …

Joy of Mirror Making: Introduction

2021-2-3 · Grinding a 6 inch [15cm] mirror to F/2.8 using a ring tool. Mirror Making Zen. Do one thing at a time. Mirror making is a process: 1. Get blank, grit, pitch 2. Roughly grind a curve in the mirror face 3. Refine the curve with diminishing grit sizes 4. Polish the mirror face 5. Parabolize the mirror face 6. Send off to aluminizing.

20" mirror grinding log

2001-11-27 · 4/12/93 full sized 20" grinding tool cast from casting plaster 1 3/4" thick, 4/16/93 1/4xlxl" unglazed ceramic bathroom tiles fiberglassed to front of tool, mirror put on top to help keep shape, 4/17/93 had to strip the tiles from the tool - they did not stick - tool not yet cured or too cold for fiberglass to set or tool not cast properly (too ...

Grinding, Polishing and Figuring

2014-7-21 · Grinding the back flat is just the first step in preventing astigmatism. The next step is the proper mirror support. Fine grind and polish the mirror face up. A thin mirror bends over the edge of the tool if it''s worked on top, so the problem reduces to supporting the mirror from its underside.

Mirror Grinding

 · Page 2 of 3 - Mirror Grinding - Take A Class Or DIY? - posted in ATM, Optics and DIY Forum: Thanks Ed. Having taught over 30 years a ATM class and 50 years professional, Read all you can, there are many paths one can follow making mirrors. I like All about Telescopes because its simple and has great drawings of what to expect. It is a hand based skill, anyone can cut down a tree, but learning ...

Grinding an 8″ F/10 Telescope Mirror – gordtulloch

2002-9-28 · Grinding an 8″ F/10 Telescope Mirror. For this project (my first time ever grinding a mirror) I ordered an 8″ Black Vitrified Ceramic (BVC) blank without a pregenerated curve from ASM Products in Ste-Basile PQ. Ordering from Canada is always cheaper once you factor in all the taxes – all told the kit cost about $185.

Internal mirror grinding with a metal ...

Precision grinding has been carried out on an ordinary grinder with an attachment for internal cylindrical grinding. Wheels of #325, #1200, #2000, and #4000 grit sizes have been applied in …

Mirror surface grinding for brittle materials ...

1994-2-1 · Use of a diamond wheel with superabrasive is required for mirror-like surface grinding of brittle materials. However, conventional dressing methods cannot apply to the diamond wheel with superabrasive. Recently, an electrolytic dressing method was developed for use with a cast iron-bonded diamond wheel and superabrasive. This technique can replace lapping and polishing. Using …

Lens & Mirror Making Best lenses and mirrors are both …

2008-3-12 · Lens & Mirror Making • Best lenses and mirrors are both made by grinding the surface • Start with a mirror or lens blank • For mirrors only surface needs to be good • Typical mirror want pyrex (eg BK7) • Then need a tool blank – poorer glass & softer glass • Place mirror on top tool

Grinding and Polishing a Meniscus Mirror – Astronomy ...

2017-10-17 · Grinding and Polishing a Meniscus Mirror. 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 of resources, online and in print, describing that. This article will focus on the specific issues introduced by working on such a mirror.

Journal of Materials Processing Technology GRINDING …

2016-8-20 · 38 Z. Zhong, T. Nakagawa / Journal of Materials Processing Technology 56 (1996) 37-44 Toroidal SiC mirrors with large curvature radii are often used in synchrotron radiation facilities. Instead of toroidal mirrors, the combination of two circular or elliptic cylinder mirrors with large curvature radii is also

Robotic mirror grinding?

 · The mirror lab substrates after spin casting aren''t accurate to a few microns so some coarse and fine grinding is still required. NC grinding of aspheres has been done but a sufficiently stiff machine with adequate resolution encoders is required together with sufficiently accurate (sub micron) metrology so that achievement of the desired shape ...

Telescope mirror grinding on Vimeo

 · Telescope mirror grinding. Fine grinding the Dream Cellular 62 cm f/3.4 Cassegrain primary spindle grinder. The grinding tool is glass tiles cast in dental stone. The grit at this stage is 25 micron aluminum oxide.

Joy of Mirror Making: Introduction

2008-3-12 · Lens & Mirror Making • Best lenses and mirrors are both made by grinding the surface • Start with a mirror or lens blank • For mirrors only surface needs to be good • Typical mirror want pyrex (eg BK7) • Then need a tool blank – poorer glass & softer glass • Place mirror on top tool