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Friday, 30 January 2015
Geneva Drive - What is its Use ? - Practical View- 1080p HD Video.
Info:
One application of the Geneva drive is in movie projectors: the film does not run continuously through the projector. Instead, the film is advanced frame by frame, each frame standing still in front of the lens for 1/24 of a second (and being exposed twice in that time, resulting in a frequency of 48 Hz). This intermittent motion is achieved using a Geneva drive. (Modern film projectors may also use an electronically controlled indexing mechanism or stepper motor, which allows for fast-forwarding the film.) The first uses of the Geneva drive in film projectors go back to 1896 to the projectors of Oskar Messter and Max Gliewe and the Teatrograph of Robert William Paul. Previous projectors, including Thomas Armat's projector, marketed by Edison as the Vitascope, had used a "beater mechanism", invented by Georges Demenÿ in 1893, to achieve intermittent film transport.
Geneva wheels having the form of the driven wheel were also used in mechanical watches, but not in a drive, rather to limit the tension of the spring, such that it would operate only in the range where its elastic force is nearly linear. If one of the slots of the driven wheel is occluded, the number of rotations the drive wheel can make is limited. In watches, the "drive" wheel is the one that winds up the spring, and the Geneva wheel with four or five spokes and one closed slot prevents overwinding (and also complete unwinding) of the spring. This so-called Geneva stop or "Geneva stop work" was the invention of 17th or 18th century watchmakers.
Other applications of the Geneva drive include the pen change mechanism in plotters, automated sampling devices, indexing tables in assembly lines, tool changers for CNC machines, banknote counting and so on. The Iron Ring Clock uses a Geneva mechanism to provide intermittent motion to one of its rings.
A Geneva drive was used to change filters in the Dawn mission framing camera used to image the asteroid 4 Vesta in 2011. It was selected to ensure that should the mechanism fail at least one filter would be usable
Gyroscopic Effect (Gyroscope) - Practical View -1080p HD Video -Mechanical Engineering
Info:
A gyroscope (from Greek γῦρος gûros, "circle" and is a device for measuring or maintaining orientation, based on the principles of angular momentum.[1] Mechanical gyroscopes typically comprise a spinning wheel or disc in which the axle is free to assume any orientation. Although the orientation of the spin axis changes in response to an external torque, the amount of change and the direction of the change is less and in a different direction than it would be if the disk were not spinning. When mounted in a gimbal (which minimizes external torque), the orientation of the spin axis remains nearly fixed, regardless of the mounting platform's motion.
Gyroscopes based on other operating principles also exist, such as the electronic, microchip-packaged MEMS gyroscope devices found in consumer electronic devices, solid-state ring lasers, fibre optic gyroscopes, and the extremely sensitive quantum gyroscope.
Applications of gyroscopes include inertial navigation systems where magnetic compasses would not work (as in the Hubble telescope) or would not be precise enough (as in intercontinental ballistic missiles), or for the stabilization of flying vehicles like radio-controlled helicopters or unmanned aerial vehicles. Due to their precision, gyroscopes are also used in gyrotheodolites to maintain direction in tunnel mining.
Kusanal, Ugar Budruk , Athani , Karnataka , India
Bhadgaon, Gadhinglaj, Maharashtra 416502
Bhadgaon is a village located in Gadhinglaj taluka, its is famous for Samangad , Gudai - temple of goddess Laxmi,
Bhadgaon has may Schools named Sadhana Highschool , Kaleshwar Highschool in Marathi Medium.
Two Engineering Colleges Named A.D. Shinde and Sant Gajanan Polytechnique,Pharmacy etc (now BE).
its amazing place with Residing Hirankeshi River.
Tuesday, 20 January 2015
Environment Project Topics / Titles List
Friday, 16 January 2015
Professional courier in Kagal , kolhapur , Maharashtra
Professional courier is near bus stand, adjacent to Highway in an cycle repair shop.
Ask any one near bus stand they will show you.
(Dated 2015) Based on self experience.
For any query contact at http://www.smspawan.tk
Ask any one near bus stand they will show you.
(Dated 2015) Based on self experience.
For any query contact at http://www.smspawan.tk
Firstflight courier in kagal, kolhapur, Maharashtra
Firstflight may not near kagal bus stand but check it out at locally Gokul Shirgaon and Kolhapur.
-self experience
-self experience
Saturday, 3 January 2015
What's that ticking sound we hear after we switch off the engine.-Mechanical Engineering.
Parts of machine are made up of different metals
which are perfectly joined (or constrained) to
each other.
When engine works, heat is generated resulting in
expansion of these metal parts.
When engine is turned off, parts of different kind
of metals cool at different rates that is a part
contracts with respect to its counter part.
Thus, they temporarily develop stress in their
joints resulting in the tickling sound.
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