To achieve the best mirror surface finish, the cutting tool must not be overworked or this is going to affect the cutting edge fairly quickly. It is advisable to look at a DOC of no more than 5 µm, then the stepover also needs to be in that magnitude relative to the tool diameter to ensure that the side forces are not overly strong. 1 of 3 Expand

mirror surfaces with very low surface roughness independent of the direction of measurement could be obtained. 2.2 Grinding of cylindrical mirrors The methods using a cup wheel for grinding the mirrors are schematically illustrated in Fig. 1. In Figs. 1 (a)

Can produce a mirror surface equivalent to super-finishing through grinding alone. Polishing work such as wrapping and super-finishing processes eliminated, facilitating shortening of the …

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 often. Rinse the mirror and inspect the grid lines. If the grid is worn out evenly, you are doing fine.

Mirror surface finishing is the grinding method to polish the metal surface into mirror-like surface by vertical grinding or buff grinding. In order to polish the surface into mirror-like surface, face roughness as well as face accuracy as swelling becomes required.

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 …

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After more than six years of grinding and polishing, the first-ever dual-surface mirror for a major telescope is complete. In March 2008, a group of people gathered around a giant, red oven in a six-story workshop space beneath the bleachers of the University of Arizona football stadium.

Complete Guide to Surface Finish Symbols, Roughness Charts, RA, RZ, Measurements, and Callouts. From basics to advanced, symbols to inspection, from CNCCookbook, the leading CNC Blog on the Internet.

Rough grinding a telescope mirror. The Joy of Mirror Making Mel Bartels Rough Grinding The first milestone is putting a curve into the mirror face. ... Geometrically, two surfaces when rubbed against each other, must create a concave sphere on …

Mirror Surface Finishing Large-size Machining + Surface. Mirror surface finishing is the grinding method to polish the metal surface into mirror-like surface by vertical grinding or buff grinding. In order to polish the surface into mirror-like surface, face roughness as well as face accuracy as swelling becomes required.

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.It 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 …

Mirror Grinding at the Spring 1998 Stellafane Mirror Workshop in the McGregor Observatory 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".

Surface finishing. Surface finishing is a broad range of industrial processes that alter the surface of a, An example would be grinding gates off of castings, deburring or removing excess, Some alloys of steel and aluminum cannot be brought to a mirror finish.

Mirror surface finishing is the grinding method to polish the metal surface into mirror-like surface by vertical grinding or buff grinding. In order to polish the surface into mirror-like surface, face roughness as well as face accuracy as swelling becomes required. The Company classifies the surface roughness state into following three ...

in the 2001-02 Stellafane Mirror Class. Fine grinding refines the basic shape you have ground into the surface of the glass with rough grinding. The sequence of ever finer grits that you use smoothes the rough surface that was made in rough grinding, and prepares you for polishing. You are also refining the shape of the surface to be a section ...

Abstract. This paper introduces a new ultraprecision mirror surface machining system with ELID (Electrolytic In-Process Dressing). The machine has three linear axes, which can be controlled at a feeding resolution of 10nm under full closed feedback. 3-axes double hydrostatic guideway are used for sliding the machine, and hydrostatic bearing is used for the grinding wheel spindle.

suitable surface preparation tech-nique. To achieve a reflective surface with mirror finish the preparation process must involve several grinding and diamond polishing steps and these have to be performed in a clean workplace. The use of proper working tools facilitates the process a lot. High surface finish reduces the risk of local corrosion ...

Mirror grinding is a grinding that the surface roughness of the workpiece is Ra< 0.01μm, and the light is like a mirror after grinding, so it can be clearly photographed. The flatness of the grinding surface is not greater than 3μm /1000mm. The surface machining of high precision and high added value parts requires mirror grinding. 2.

Polishing or grinding typically refers to the abrasive machining process but polishing or grinding finish refers to a patterning process applied as a surface finish. The variations in the final pattern depend on factors such as the workpiece material, grinding material, polisher, patterns, and the variations of the patterns' width, length, direction, shape or depth.

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 (e.g. F/D = 4) well suited for deep sky observations. On the opposite, a shallow mirror (e.g. F/D = 8) will be performing very well on planets and the moon.

Therefore, such surfaces are suitable for certain unmachined clearance areas. 12.5: 500: These are rough, low-grade surfaces resulting from coarse feeds and heavy cuts. While the cuts come from turning, milling, disc grinding, and more. 6.3: 250: This type of surface finish results from surface grinds, disc grinds, milling, drilling, and more.

Mirror grinding is a grinding that the surface roughness of the workpiece is Ra< 0.01μm, and the light is like a mirror after grinding, so it can be clearly photographed. The flatness of the grinding surface is not greater than 3μm /1000mm.

2. ELID grinding technology applied to cemented carbide The steel-bonded cemented carbide is subjected to mirror grinding, and the surface roughness of the workpiece is Ra=0.003 μm~0.011 μm. If a finer grinding wheel (above W1) is used, the Ra value will be significantly reduced and a better surface roughness will be obtained.