Loc: Oregon, South Western Coast. Posted 22 June 2021 - 02:01 PM. Robot or CNC machining of glass has been around since late 1960's, they were simple machines using punched tape. produced by a computer. It was used on free form optics. There was what is called profile grinding / polishing.
The purpose of this paper is to propose a compensation grinding method for large aspheric mirror surface. Because the tradition grinding is not suitable for large aspheric mirror surface, in this paper, a grate parallel grinding in 3-axis and an on-machine measurement system are applied. Based on that, it presents the errors that mainly affect the form accuracy and …
Abstract： As a low cost and high efficiency ultra-precision mirror processing technology-ELID mirror grinding technology,is widely used in the field of modern ultra-precision machining.This paper summaried the historical development and the present research situation of ELID mirror grinding technology,introduced to the processing mechanism of the technology and the …
A look at a 15" Telescope Mirror, with Ronchi history. The fabrication of this 15" F4.5 primary telescope mirror began with a planoplano blank. I used my own diamond grinding equipment to generate the rough curve here. After the generation, I poured a steel grinding tool and used #40 silicon carbide abrasive to get the mirror close to the ...
Working Like Hell: My Mirror Grinding Station Our Great Guru looked at my work, and said, "Say, you're pretty fast." Then, ominously, he waved the blank at me. "Next time we'll see if this is a half- assed job." Chapter Two: Grinding With the 120 Grit, June 11, 2000 My mirror is hyperbolic. In my zeal to achieve an f/8 curve so quickly, I ...
3. Grinding characteristics of quartz mirror 3.1. Grinding method, experimental set-up and conditions A precision grinding with electrolytic dressing process [8] was applied to finish mirrors; figure 2 illustrates the experimental grinding set-up, which was developed in our previous research. A rotary surface grinder, with air hydrostatic ...
spin grinding a slumped mirror - posted in ATM, Optics and DIY Forum: so after taking a few years off from the hobby to get my wife well i have completed my spin grinder and am ready to tackle the 14 honeycombed mirror that you see as my avatar i had it fused to shape many years ago and it is slumped to an F5 curve. i have not used a spin grinder as yet all my …
Making a Concave Mirror Using 15th Century Technology. I decided to see if I could make a suitable concave mirror using only technology that would have been available in the 15th century, with the goal of producing a "mirror lens" of …
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 …
1.45 metre scale Zerodur® mirror segment for the European Extremely Large Telescope (E-ELT) is introduced. Employing an R-theta grinding mode with a multi stage grinding process material removal rates of up to 187.5 mm3/s are achieved, whilst typically removing up to 1 mm depth of material in total.
This paper deals with mirror grinding of a small-sized aspherical lens by the resin bonded diamond spherical wheel. Up to now, a spherical lens has been used for the lens of the optical ...
Grinding your own telescope mirror seemed like a cool idea until I did more research and discovered all the physical … Build a machine to grind the mirror …
Grinding Wheels. Grinding Wheels List. Ceramic Grain CX Wheel. Vitrified-bonded Wheel for Gear Grinding "Gear Ace". New Super-finishing Wheel "Keen Stone". Vitrified-Bonded Wheel for Precision Grinding "LIFE KING". New Mirror …
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
A New 20" f/3.5" Fast Mirror on Quartz, Part 1, Measurements (added 05/03/10) Ronchi and Foucault Tests on the 20" f/4.5 Quartz Telescope Mirror (added 04/29/10) Figuring a 20" Mirror, Part 1: Reducing a High Zone. Figuring …
New Grinding Methods for Aspheric Mirrors with Large Curvature Radii Z. Zhong, The institute of Physical and Chemical Research/Japan - Submitted by T. Nakagawa (l), University of Tokyo/Japan Received on January 14,1992 ABSTRACT: In this paper some new methods for grinding toroidal mirrors, elliptic and circular cylinder mirrors with large curvature radii are …
The vitrified bond wheel, however, enabled high efficiency grinding but resulted in traces of detached AlN grains forming at the machined surface. Highly efficient mirror grinding of AlN could be achieved by using a vitrified bond wheel for semi-finishing and …
Hi folks . Its been ten years since I first read up on grinding mirrors then the idea got placed on the bucket list and shelved. I have been thinking about the idea quite a bit again over the last couple of years, and now my observatory is pretty much complete I think I'm ready to give mirror grinding a go I must say reading some of the Dob build threads on SGL have also …
3. AEGM for axisetric aspheric mirror In conventional methods of grinding an axisymmetric aspheric mirror, the wheel axis is fixed in a perpendicular position relative to the workpiece axis"'. The grinding path, OA, is a plane curve parallel to the xz-plane, as shown in Fig. 2(a). Only one part of the wheel (point PA) is used in this grinding ...
Research output: Contribution to journal › Article › peer-review. 1 Citation (Scopus) Overview; Fingerprint; Abstract. The goal of this paper is a mirror grinding of ceramic cylinder with an extremely fine grit diamond wheel. An ultra precision cylindrical grinding machine and a truing and dressing device for it are designed and built. For ...
/ Effect of mirror surface grinding with ELID and its characteristics - Surface properties and quality due to material and grinding wheel. In: Seimitsu Kogaku Kaishi/Journal of the Japan Society for Precision Engineering. 2013 ; Vol. 79, No. 4. pp. 278-286.
In order to explore the new way to precision machining of the cylindrical, ELID precision mirror grinding technology are employed to precision ultra-precision grinding experiments. Given ELID precision mirror grinding technology has effectively solved the basis of many of the typical flat-precision machining difficult materials and efficient processing, through the conversion process …
A mirror blank is ready for grinding in this image. A layer of grit and water will be added to the top of the blank before the machine is turned on. Waite Research
ultra-precision grinding machine, called BoX®, and reported their research on grinding of a hexagonal SiC part with 400 mm across corners [ 13,14].Experimentalresultsshowed that severe wheel wear occurred and the diamond wheel re-quired to be dressed each 26.5 min to maintain a normal grinding force. The final achieved form accuracy of the 400-