Contour Mode Deterministic Microgrinding

Analysis of chatter in contour grinding of optical ...

Aug 01, 2002· Chatter that limits ground surface finish has been observed in the deterministic microgrinding of brittle optical materials. In this article, the classical single degree of freedom model for chatter, accounting for both work and tool regenerative effects, is adapted for contour …

Analysis of chatter in contour grinding of optical ...

Chatter that limits ground surface finish has been observed in the deterministic microgrinding of brittle optical materials. In this article, the classical single degree of freedom model for ...

Prepolishing on a CNC platform with bound abrasive contour ...

May 01, 2003· Deterministic microgrinding (DMG) of optical glasses and ceramics is the commercial manufacturing process of choice to shape glass surfaces prior to final finishing. This process employs rigid bound matrix diamond tooling resulting in surface roughness values of 3-5μm peak to valley and 100-400nm rms, as well as mid-spatial frequency tool marks that require subsequent removal in …

Advancements in asphere manufacturing - NASA/ADS

Sep 01, 2013· Contour deterministic microgrinding is performed on a Pro80 or eSX platform. These platforms utilize software and the latest advancements in machine motion to accurately contour the aspheric shape. Then the optics are finished using UltraForm Finishing (UFF), which is a sub-aperture polishing process.

Minimizing chatter in deterministic microgrinding by ...

May 01, 2003· Minimizing chatter in deterministic microgrinding by process parameter selection Tong, Sha; ... In this paper a model for regenerative chatter during the contour grinding of optical surfaces is developed. In this model, a nonlinear formula for projected contact area is used to derive the process cutting stiffness that predicts the occurrence of ...

Center for Optics Manufacturing deterministic microgrinding

Initial data indicates that the newly developed deterministic microgrinding process will generate specular optical surfaces. Deterministic microground surfaces, with 100 - 300 angstroms surface finishes, 1 - 2 microns of subsurface damage, and 1 wave peak-to-valley surface figure, have been produced on a range of glass types.

Measurement of the Preston coefficient of resin and bronze ...

Apr 01, 2006· Deterministic microgrinding (DMG) has become one of the major methods used for fabrication of precision optical components , ... Preston coefficient because the normal grinding force F N is easier to measure than the tangential grinding force during contour grinding. ... where the brittle grinding mode can be clearly identified.

1.- Fabrication Processes

Transition between brittle and ductile mode in loose abrasive grinding Donald Golini, Stephen D. Jacobs [1990] Ductile regime grinding of glass and other brittle materials by the use of ultrastiff machine tools William J. Wills-Moren, Keith Carlisle, Patrick A. McKeown, Paul Shore [1990] Center for Optics Manufacturing deterministic microgrinding

Measurement of the Preston coefficient of resin and bronze ...

Deterministic microgrinding technology [5] applies a bound-abrasive tool which was positioned by a computer numerically controlled machine to build precision optical glass components. A typical ...

Effect of Etching and Imaging Mode on the Measurement of ...

Microgrinding of optical glass has been under intensive study recently. Characterization of the subsurface damage (SSD) generated by this process is very important because it is one of the criteria used to characterize the quality and efficiency of the microgrinding technique. SEM, as a new method, is applied for a detailed observation of the SSD.

Center for Optics Manufacturing deterministic microgrinding

Initial data indicates that the newly developed deterministic microgrinding process will generate specular optical surfaces. Deterministic microground surfaces, with 100 - 300 angstroms surface finishes, 1 - 2 microns of subsurface damage, and 1 wave peak-to-valley surface figure, have been produced on a range of glass types.

Tribological and mechanical properties of Cu/Ni ...

Deterministic microgrinding technology [5] ... A typical contour grinding process uses two tools sequentially. A rough tool with 10–20 μm hard particles is used to remove bulkmaterial.Then,afinetoolwith2–4μmhardpar- ... mode. To measure weight percentage of carbon of the coatings, 5 regions were tested and 4 of them were 3 ...

Measurement of the Preston coefficient of resin and bronze ...

Apr 01, 2006· Deterministic microgrinding (DMG) has become one of the major methods used for fabrication of precision optical components , ... Preston coefficient because the normal grinding force F N is easier to measure than the tangential grinding force during contour grinding. ... where the brittle grinding mode can be clearly identified.

Glass-ceramics: deterministic microgrinding, lapping, and ...

DETERMINISTIC MICROGRINDING DETERMINISTIC MICROGRINDING Roughness vs. Abrasive size Twyman effect E 2 GC1 to E 1 U) to C) GC3 GC1 to C .C (I) V C I0.5 to C) to U) to C) to to IQ2.QP abr. 2-4 abrasive size L, tm 0 ize, m 120 130 140 150 Indentation crack size 2c (0 1 kgf), jim FIG. 4 Dependence of surface microroughness on abrasive size in ...

Measurement of the Preston coefficient of resin and bronze ...

Deterministic microgrinding technology [5] applies a bound-abrasive tool which was positioned by a computer numerically controlled machine to build precision optical glass components. A typical ...

Paul FUNKENBUSCH | Professor (Full) | PhD | University of ...

Deterministic microgrinding technology applies a bound diamond abrasive tool positioned by a Computer Numerically Controlled (CNC) machine to generate precision optical components.

Effect of Etching and Imaging Mode on the Measurement of ...

Microgrinding of optical glass has been under intensive study recently. Characterization of the subsurface damage (SSD) generated by this process is very important because it is one of the criteria used to characterize the quality and efficiency of the microgrinding technique. SEM, as a new method, is applied for a detailed observation of the SSD.

1.- Fabrication Processes

Transition between brittle and ductile mode in loose abrasive grinding Donald Golini, Stephen D. Jacobs [1990] Ductile regime grinding of glass and other brittle materials by the use of ultrastiff machine tools William J. Wills-Moren, Keith Carlisle, Patrick A. McKeown, Paul Shore [1990] Center for Optics Manufacturing deterministic microgrinding

Agilent J-BERT N4903B High-Performance Serial BERT

decomposition simplifies identifying deterministic jitter sources (see Figure 7). Eye contour The eye opening is a key characteristic of a device. The BER is displayed as a function of sampling delay and sampling threshold. Different views are available: eye contour (see Figure 8), pseudo colors and equal BER plots. BERT scan including RJ/DJ ...

Sheryl M. Gracewski's research works | University of ...

Sheryl M. Gracewski's 97 research works with 1,353 citations and 2,664 reads, including: Two passive mechanical conditions modulate power generation by the outer hair cells

Twyman effect mechanics in grinding and microgrinding ...

In the Twyman effect (1905), when one side of a thin plate with both sides polished is ground, and is in a state of compressive residual stress, described in terms of force per unit length (Newtons per meter) induced by grinding, the stress (Newtons per square meter) induced by grinding, and the depth of the compressive layer (micrometers). We describe and correlate experiments on optical ...

Chatter in deterministic microgrinding of optical glasses ...

Chatter in deterministic microgrinding of optical glasses Chatter in deterministic microgrinding of optical glasses Li, Yi 1999-11-11 00:00:00 ABSTRACT In this paper, the chatter observed in the deterministic microgrinding of optical glasses is examined. Because chatter adversely affects ground surface quality, understanding and eliminating chatter could significantly reduce total fabrication ...

OSA | FAUST and WAGNER: producible shapes

The generation of off-axis parts of rotationally symmetric surfaces applying FAUST and WAGNER is analyzed showing that there are often two fabrication processes possible. The producible surface shapes are discussed showing the possibility of producing optical surfaces performing several functions in a single production step.

Contour detection by using information theory of ...

Jan 01, 1991· Contour detection by using information theory of deterministic functions☆. Author links open overlay panel Guy Jumarie. Show more

Center for Optics Manufacturing deterministic microgrinding

Initial data indicates that the newly developed deterministic microgrinding process will generate specular optical surfaces. Deterministic microground surfaces, with 100 - 300 angstroms surface finishes, 1 - 2 microns of subsurface damage, and 1 wave peak-to-valley surface figure, have been produced on a range of glass types.

Glass-ceramics: deterministic microgrinding, lapping, and ...

DETERMINISTIC MICROGRINDING DETERMINISTIC MICROGRINDING Roughness vs. Abrasive size Twyman effect E 2 GC1 to E 1 U) to C) GC3 GC1 to C .C (I) V C I0.5 to C) to U) to C) to to IQ2.QP abr. 2-4 abrasive size L, tm 0 ize, m 120 130 140 150 Indentation crack size 2c (0 1 kgf), jim FIG. 4 Dependence of surface microroughness on abrasive size in ...

Chatter in deterministic microgrinding of optical glasses ...

Chatter in deterministic microgrinding of optical glasses Chatter in deterministic microgrinding of optical glasses Li, Yi 1999-11-11 00:00:00 ABSTRACT In this paper, the chatter observed in the deterministic microgrinding of optical glasses is examined. Because chatter adversely affects ground surface quality, understanding and eliminating chatter could significantly reduce total fabrication ...

Contour Tracking - Iowa State University

The effective basis may be fixed or time varying. Based on this assumption, we modify the particle filtering method to perform sequential importance sampling only on the effective basis dimensions, while replacing it with deterministic mode tracking in residual space (PF-MT). We develop the PF-MT idea for contour tracking.

Contour detection by using information theory of ...

Jan 01, 1991· Contour detection by using information theory of deterministic functions☆. Author links open overlay panel Guy Jumarie. Show more

High-accuracy micromachining of ceramics by frequency ...

Oct 08, 2004· With this system different ceramic parts have been processed using a 5W frequency tripled high repetition rate Nd:YAG-Laser. Optimum accuracies and surface qualities have been achieved using scanning strategies with varying scanning angles for subsequent ablation layers, a combination of contour mode and form filling scanning ablation.

1.- Fabrication Processes

Transition between brittle and ductile mode in loose abrasive grinding Donald Golini, Stephen D. Jacobs [1990] Ductile regime grinding of glass and other brittle materials by the use of ultrastiff machine tools William J. Wills-Moren, Keith Carlisle, Patrick A. McKeown, Paul Shore [1990] Center for Optics Manufacturing deterministic microgrinding

Agilent J-BERT N4903B High-Performance Serial BERT

decomposition simplifies identifying deterministic jitter sources (see Figure 7). Eye contour The eye opening is a key characteristic of a device. The BER is displayed as a function of sampling delay and sampling threshold. Different views are available: eye contour (see Figure 8), pseudo colors and equal BER plots. BERT scan including RJ/DJ ...

Sheryl M. Gracewski's research works | University of ...

Sheryl M. Gracewski's 97 research works with 1,353 citations and 2,664 reads, including: Two passive mechanical conditions modulate power generation by the outer hair cells

Counter (CTR) Mode in Cryptography - includehelp

This article is about the Counter Mode.In this article, we will briefly study the basic CTR and its examples aim to capture. We will cover the types of message in Counter Mode. Submitted by Monika Sharma, on February 21, 2020 . The Counter Mode or CTR is a simple counter based block cipher implementation in cryptography. Each or every time a counter initiated value is encrypted and given as ...

Volume Table of Contents

Surface contour measurement using an optical scanner. Jingchi Yu, ... Deterministic Microgrinding and Tool Development II. Rapidly renewable polishing lap. Christopher J. Evans, Robert E. Parks. Proc. SPIE 2536, Optical Manufacturing and Testing, pg 248 (8 September 1995); doi: 10.1117/12.218429 ...

Laser Diode Tuning of Wavelength | DBR Laser Mode Hop

Figure 4. Contour plot of the emission wavelength against injection current and heatsink temperature. The two solid lines indicate a mode-hop-free constant power operation with a tuning range of 2 and 1.7 nm, at an output power of 60 and 90 mW, respectively.

A magnetorheological polishing-based approach for studying ...

Apr 01, 2007· Microgrinding with a rough tool (40 μm grit size) involved fracture, leading to a p–v surface-roughness in the range 3.2–5.8 μm (150–700 nm rms). Microgrinding with medium and fine tools (10–20, and 2–4 μm grit size, respectively) was controlled by plastic flow.

Influence of the position and size of various ...

Feb 01, 2021· 1. Introduction. Among the metal additive manufacturing techniques, Laser Powder Bed Fusion (LPBF) is widely recognized as one of the most promising method for the industry of the future, due to the attractive characteristics of built parts including: a high degree of complexity, a good spatial resolution (around 0.1 mm precision), and good mechanical resistance under static loading .