free e-book downloads

Here is a list of websites that offers free e-book downloads, feel free to peruse them for your research/previewing purpose :

• http://www.ebooklobby.com/
• http://www.computer-books.us
• http://www.textbookrevolution.org/
• http://www.freetechbooks.com/
• http://www.giuciao.com/
• http://ebookshare.net
• http://pdfchm.com
• http://www.mininova.org/cat/2

Note: Most of the book listed on these websites are copyrighted by their respective publishers/authors. Downloading material without express permission from the copyright holder might be illegal in your country, you have been warned.

gear shaping images

Gear shaping is a machinery process for generating teeth by a corresponding cutter. Gear shaping has become a convenient operation and one of the most versatile of all gear cutting operations.

















Types of cutters used for gear shaping can be grouped into about four categories: #disk, #hub, #shank, and #helical cutters.

The cutters are essentially gears that are used to form the teeth. This method of gear cutting is based on the principle that any two gears will mesh if they are of the same pitch, proper helix angle, and proper tooth depth and thickness





Process Characteristics:
By using a gear-shaped corresponding cutter that is rotated (in relation to a blank gear) produces the gear teeth. The cutters that are rotated are timed with the workpiece. This process produces internal gears, external gears, and integral gear-pinion arrangements


Process Schematic:
The developing process of gear shaping involves a toothed disk cutter which reciprocates in axial rotations. The workpiece (or blank gear) rotates on a second shaft (spindle). The workpiece is correspondent with the cutter and it gradually feeds into the cutter while rotating. If a two-step process is used, all tooth spaces are partially cut before the finishing.


Setup and Equipment:
The machine used for gear shaping generally consists of a base, column spindle, and an arbor. The gear cutter is then mounted on the spindle, and the gear blank is mounted on the arbor. The cutter reciprocates up and down while the work piece(gear blank) is gradually fed into the cutter. At the end of each cutting rotation, the spindle is retracted slightly to discourage anymore cutting into the new cut teeth of the gear.




References and External Links:
Todd, R (1994). "Gear Shaping", Manufacturing Processes Reference Guide.
Gear Shaping Machines. Gear Shaping Machines. Retrieved on January 13, 2009.

SMALL BICYCLE

Just how small can a bicycle be and still be ridden by a person?

Zbigniew Rozanek of Pleszew,

Poland built a mini-bike and on August 11 1998 rode it a total of 5 meters or 16 feet.

The back wheel on the
world's smallest bicycle was a mere 13 mm. or .51 inches and
the even smaller front wheel was just 11 mm. or .43 inches in diameter.

BIGGEST Engines

DEFINITIONS FOR NANO,NANO TECHNOLOGY,NANO SCIENCE

DEFINITION-FOR NANO:
From the Greek word Nanos - meaning "dwarf" this prefix is used in the metric system to mean 10-9 or one billionth (1/1,000,000,000). Thus a nanometer is 10-9 or one billionth of a meter, a nanojoule is 10-9 or one billionth of a Joule, etc

DEFINITION-NANO TECHNOLOGY:
Nanotechnology, shortened to "Nanotech", is the study of the control of matter on an atomic and molecular scale. Generally nanotechnology deals with structures of the size 100 nanometers or smaller, and involves developing materials or devices within that size

SOURCE,..(WWW.GOOGLE.COM)

தி SMALLAEST மோட்டார் சைக்கிள் இன் தி WORLD

Ever dreamed riding the smallest motorcycle in the world. A designer from Sweden, Tom Wilberg made the smallest motorcycle in the world. How about the size? It is not as big as fist adults. Although it is so small, adult person may ride it. This motorcycle was created in 2003.

How small the motor is! The height is only 6.5 cm and the length is 11.4 cm. The diameter of the front wheel is just 1.6 cm. Meanwhile, the rear wheels is not more than 2.2 cm. The wheelbase is only 8 cm. As a driving power, Tom installed mini machine which has power about 0.3 kw.

At the first time I knew this motorcycle, I was in doubt whether we can ride it or not because of its small size. But, I’m wrong. You are able to ride it. If you want to ride it, there are two alternative ways. First, you use a stiff. Second, you can use two feet like squating on the iron appeared there. How about the speed? From the result of trying out, this motor can be taken as far as 10 meters with a speed of 2 km / hour.

Because it can can carry people, the motorcycle designed by Tom Wilberg is respected as the smallest motorcycle in the world by Guiness Books of Records. Untill now, the record of the smallest motorcycle in the world has not been broken. Meanwhile, Tom is still innovating to make the tallest motorcycle in the world.