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My name is Sandy Putra. Check following links if you like to know me more:

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GD&T

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GD&T stands for Geometric Dimensioning and Tolerancing and is written in  ASME Y14.5-2009.  The GD&T is used often in creating detail 2D drawing and is very powerful tools to ensure that the product will be correctly manufactured.  See below for the most used GD&T symbols. 
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Photolithography

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The word lithography comes from the Greek  lithos , meaning stones, and  graphia , meaning to write. It means quite literally writing on stones. In the case of semiconductor lithography (also called photolithography) our stones are silicon wafers and our patterns are written with a light sensitive polymer called a photoresist. To build the complex structures that make up a transistor and the many wires that connect the millions of transistors of a circuit, lithography and etch pattern transfer steps are repeated at least 10 times, but more typically are done 20 to 30 times to make one circuit. Each pattern being printed on the wafer is aligned to the previously formed patterns and slowly the conductors, insulators, and selectively doped regions are built up to form the final device. [1] The steps used in photolithography is well described at following figures. [2] Intel has this nice simple way of description for the photolithography process in video.  SOURCE: INTEL
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GEAR

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Recently I have some chances to attend courses about Gear technology in Industrial Technology Research Institute ( 工業技術研究院)  located in Taichung. The classes held in Chinese, so it's a bit tough for me to follow, but still I found it interesting. In this post, I am trying to compile information about GEAR and hope this will be useful. A. WORM GEAR.       This type of gear is normally used when the high ratio is desired. Following video from Dr. E shows some information about it. [1] Here is the component of worm gear [2]. Application of worm gear:  Hoisting machines Automobile steering mechanisms Elevator Conveyors Packaging machine Presses If you wish to understand the calculation behind worm gear's design, you may want to check this page . B. BEVEL GEAR     Normally Bevel Gear is used when the power of one shaft must be transferred at different angle to another shaft. See below animation for better understanding. [3] Bevel Ge
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