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timesIntroduction to Computer Numerically Controlled (CNC) Machines
[ Introductory Concepts of Machining ~ What is Computer Numerical Control? ~ Advantages of a CNC Machine ~ Classification of NC Systems ~ Point-to-point systems ~ Contouring systems ~ Coordinate Systems ~ Incremental Systems ~ Absolute System ~ Unit of Displacement ~ Part Programming ~ Servo Control ~ Types of Servo Control ~ Coordinated Axis ~ Point-to-point Axis ~ Spindle Axis ~ Open Loop Systems ~ Closed Loop systems ~ Appendix-2 Typical Specifications of a CNC System ]
Topic Under: CNC
Last download: Mon May 20, 2013 02:06:04 AM
timesSupervisory Control and Data Acquisition (SCADA) Systems
Supervisory Control and Data Acquisition (SCADA) Systems, File : pdf, 842 KB, 94 pages TOC CHAPT 1. INTRODUCTION Purpose Scope References Currency CHAPT 2. FUNDAMENTALS OF CONTROL General control Discrete control Analog control Classes of analog controllers Control loops Types of controllers
Topic Under: SCADA Systems
Last download: Mon May 20, 2013 12:22:30 AM
timesIntroduction to Welding (PPT file, 250 MB)
The purpose of welding is to join metal parts or pieces together. Some of the industries ... Standard for Welding Procedure and Performance Qualification ...
Topic Under: Welding Systems
Last download: Mon May 20, 2013 01:22:52 AM
timesPneumatic Control Systems
[ Pneumatic Proportional Controller ~ Pneumatic Proportional plus derivative controller ~ Pneumatic Proportional Plus Integral Controller ]
Topic Under: Pneumatics System
Last download: Mon May 20, 2013 02:02:36 AM
timesINTRODUCTION TO COMPUTER NUMERICAL CONTROL (CNC)
CONTENTS CHAPTER I Introduction to Computer Numerical Control Manufacturing I ... Job Stored on CD 388 18-4 Using the Virtual CNC to Inspect the Machined Part 393 CHAPTER 19 Fundamental ...
Topic Under: CNC
Last download: Mon May 20, 2013 12:30:45 AM
Recently Added, Site Update Fri May 10, 2013 08:05:14
[ pdf ] Flow Orifice Sizing
Topic: Flow Measurement
Beta Ratio Limits • Beta ratio β = d D = Bore P ipe ID • Change pipe size or pressure drop to stay within beta ratio range for flow meters. • Do not change pipe more than one standard pipe size. • Beta ratio limits for flow meters are (Miller Table 9.54): Flow meter β Range Square edge orifice 0.2-0.75 (design 0.7 max) Quadrant edge orifice 0.24-0.6 Venturi 0.4-0.7
[ pdf ] DEVELOPMENT OF ORIFICE METER STANDARDS
Topic: Flow Measurement
This paper is for the purpose of reviewing how we have arrived at the orifice meter standards, what is their value and what we can expect in the future. It is of value to review this background since respect for the orifice standards (and other standards) has diminished. This can lead to real chaos for the gas industry. The last way you want to solve your measurement problems is based on personal opinions – this is the purpose of the standards, because it represents consensus data with legal standing
[ pdf ] Positive Displacement Principle of Operation
Topic: Displacement Measurement
These meters are of the rotary positive displacement type. The accurately-machined housing contains a rotor which revolves on ball bearings and carries evenlyspaced blades. As liquid ﬂ ows through the meter, the rotor and blades (vanes) revolve about a ﬁ xed cam causing the blades to move outward. The successive movement of the blades forms a measuring chamber of precise volume between two of the blades, the rotor, the housing, the bottom, and the top covers. A continuous series of these closed chambers is produced for each rotor revolution. Neither blades nor rotor contact the stationary walls of the measuring chamber.
[ pdf ] Gas chromatography mass spectrometry
Topic: Gas Analyzers
Gas chromatography (GC) is undoubtedly one of the key techniques used for screening / identification / quantification of many groups of non-polar and/or semi-polar food toxicants (or their GC amenable derivatisation products). The high attainable separation power (potential number of theoretical plates) in combination with a wide range of the detectors employing various detection principles to which it can be coupled makes GC an important, often irreplaceable tool in the analysis of (ultra)trace levels of toxic food components that may occur in such complex matrices as foods and feeds