Sheet Metal Fabricator

Welding - Underwater Welding - Laser Machine - Welding Basics

Metal Stool - Metal Frame - Metal Roof - Metal Manufacturing






Micromachined Mirrors

RRP $35.00

Micromachined scanning mirrors are interesting for a wide variety of applications because of their potential low cost, high speed, low power consumption, and reliability. These mirrors can offer significant advantages over macro-scale mirrors, but the fundamental limitations of scanning mirrors have not been widely discussed.
Miniaturization in electronic systems has led to radical improvements in computers and communications, and micromachining technologies promise to generate such improvements in miniaturized mechanical and optical systems, including specifically higher-speed, smaller, lower-cost scanning mirrors. Micromachined Mirrors provides an overview of the performance enhancements that will be realized by miniaturizing scanning mirrors like those used for laser printers and barcode scanners, and the newly enabled applications, including raster-scanning projection video displays and compact, high-speed fiber-optic components.
There are a wide variety of methods used to fabricate micromachined mirrors - each with its advantages and disadvantages. There are, however, performance criteria common to mirrors made from any of these fabrication processes. For example, optical resolution is related to the mirror aperture, the mirror flatness, and the scan angle. Micromachined Mirrors provides a framework for the design of micromirrors, and derives equations showing the fundamental limits for micromirror performance. These limits provide the micromirror designer tools with which to determine the acceptable mirror geometries, and to quickly and easily determine the range of possible mirror optical resolution and scan speed.
Micromachined Mirrors presents descriptions of mirrors made from two fabrication processes - the surface-micromachining process and the staggered torsional electrostatic combdrive (STEC) high-aspect ratio micromachining process. The mirrors made using these two processes are evaluated for scan speed, optical resolution, ease of manufacture, and reliability.
Micromachined Mirrors also presents an example application of surface-micromachined mirrors: a raster-scanning projection video display. This demonstration shows the advantages of micromachined mirrors (small high-speed scanners) with special attention paid to the major drawback of surface-micromachined mirrors (lower resolution due to dynamic deformation). The successful demonstration of this simple prototype video display helps clarify the importance of the critical performance characteristics to consider when designing micromachined mirrors.


Machine Readable Labels In The Blood Transfusion Service

RRP $271.99

Dr W J Jenkins In 1977 when the Sheffield Transfusion Centre took delivery of the first GROUPAMATIC blood grouping machine in the UK it was equipped with a sample identification system involving complicated and expensive disposable punched cards. In fact, the cards were so expensive that Dr Wagstaff was unable to find the revenue to support the system. A year later, when Brentwood took delivery of a GROUPAMATIC, we were faced with the same problem, but by chance we heard that KONTRON was developing a laser scanning system for bar code labels and we were able to have our machine modified. Subsequently the Sheffield machine was altered to take the bar code scanner. At about the same time the Bristol Centre was helping TECHNICON with the development of the AUTO GROUPER C-16, and fortunately they decided on a laser reader of the same type for bar code identification. Thus there were three centres with the capability for reading bar codes on blood grouping machines and it became necessary to find someone to produce the bar code labels. There was only on~ printer in the UK who could produce labels to the required specification. To cut the costs of printing, and in the hope of avoiding a wide variation in codes, I invited representatives of centres interested in the problem to a meeting, where we set up what we called the Group of Six. This later became an official Working Party of the Regional Transfusion Directors.


Micromachined Mirrors

RRP $574.99

Micromachined Mirrors provides an overview of the performance enhancements that will be realized by miniaturizing scanning mirrors like those used for laser printers and barcode scanners, and the newly enabled applications, including raster-scanning projection video displays and compact, high-speed fiber-optic components.
There are a wide variety of methods used to fabricate micromachined mirrors - each with its advantages and disadvantages. There are, however, performance criteria common to mirrors made from any of these fabrication processes. For example, optical resolution is related to the mirror aperture, the mirror flatness, and the scan angle. Micromachined Mirrors provides a framework for the design of micromirrors, and derives equations showing the fundamental limits for micromirror performance. These limits provide the micromirror designer tools with which to determine the acceptable mirror geometries, and to quickly and easily determine the range of possible mirror optical resolution and scan speed.


Principles And Practice Of Laser Dentistry

RRP $110.00

Expand your skills in the rapidly growing field of laser dentistry! Principles and Practice of Laser Dentistry uses a concise, evidence-based approach in describing protocols and procedures. Dr. Robert A. Convissar, a renowned lecturer on this subject, has assembled a diverse panel of international contributors; he's also one of the first general dentists to use lasers in his practice. The book covers the history of lasers in dentistry and laser research, plus the use of lasers in periodontics, periodontal surgery, oral pathology, implantology, fixed and removable prosthetics, cosmetic procedures, endodontics, operative dentistry, pediatrics, orthodontics, and oral and maxillofacial surgery. Full-color images show the latest laser technology, surgical techniques, and key steps in patient treatment.




  • Full-color photos and illustrations demonstrate surgical techniques and key teaching points.

  • A Laser Fundamentals chapter describes the physics of lasers and the wavelengths that can produce better outcomes.

  • Introducing Lasers into the Dental Practice chapter provides guidelines on investing in laser technology and in marketing this new procedure.

  • Clinical Tip and Caution boxes include advice and alerts that can only be offered by a seasoned practitioner of 27 years.


Thermo-energetic Design Of Machine Tools

RRP $354.99

The approach to the solution within the CRC/TR 96 financed by the German Research Foundation DFG aims at measures that will allow manufacturing accuracy to be maintained under thermally unstable conditions with increased productivity, without an additional demand for energy for tempering. The challenge of research in the CRC/TR 96 derives from the attempt to satisfy the conflicting goals of reducing energy consumption and increasing accuracy and productivity in machining.

In the current research performed in 19 subprojects within the scope of the CRC/TR 96, correction and compensation solutions that influence the thermo-elastic machine tool behaviour efficiently and are oriented along the thermo-elastic functional chain are explored and implemented. As part of this general objective, the following issues must be researched and engineered in an interdisciplinary setting and brought together into useful overall solutions:

1. Providing the modelling fundamentals to calculate the heat fluxes and the resulting thermo-elastic deformations in a comprehensive manner,

2. Mapping of the structural variability as a result of the relative movement inside the machine tool,

3. Providing the tools for an efficient adjustment of parameters that vary greatly in time and space by means of parameter identification methods as a prerequisite for correction and compensation solutions,

4. Engineering and demonstrating solutions to control-integrated correction of thermo-elastic errors by an inverse position setpoint compensation of the error at the TCP,

5. Engineering and demonstrating solutions based on the material properties to compensate for thermo-elastic effects through a homogeneous propagation of the temperature field, as well as reducing and smoothing the distribution of heat dissipated in supporting structures,

6. Developing metrological fundamentals to record the thermo-elastic errors in special structural areas of machine tools,

7. Engineering a methodological approach to simultaneous and complex evaluation of the CRC/TR 96 solutions, referring to their impact on product quality, production rate, energy consumption and machine tool costs



Search

Sheet Metal Fabricator Articles

Welding Underwater Welding Laser Machine Welding Basics
Metal Stool Metal Frame Metal Roof Metal Manufacturing
Metal Corrosion Metal Art Metal Gazebo Metal Furniture

Sheet Metal Fabricator Books

Welding Underwater Welding Laser Machine Welding Basics
Metal Stool Metal Frame Metal Roof Metal Manufacturing
Metal Corrosion Metal Art Metal Gazebo Metal Furniture

Sheet Metal Fabricator