Car wheels spin at different speeds, especially when turning. Each wheel travels a different distance through the turn, and that the inside wheels travel a shorter distance than the outside wheels. Since speed is equal to the distance travelled divided by the time it takes to go that distance, the wheels that travel a shorter…
Let us also understand the classes of fires. Class A These are fires that involve some solid material like, clothers, paper, junk-heap, wood etc. Class B These are fires that involve liquid materials like: petrol, gasoline, diesel, oil etc. Class C These are fires that involve electrical elements Class D These are fires are those involve…
Two of the most popular suspensions systems for passenger cars today are the double wishbone suspension system and the MacPherson strut suspension system. While it is more usual to see the double wishbone system at the rear end of the car, MacPherson’s solution normally finds its place at the front end of the car. Both…
Anti-Lock Braking System is a safety system that allows the wheels on a motor vehicle to continue interacting tractively with the road surface as directed by driver steering inputs while braking, preventing the wheels from locking up (that is, ceasing rotation) and therefore avoiding skidding. A skidding wheel (where the tire contact patch is sliding relative to the road) has less traction than a non-skidding wheel. If you…
Calculations for heat exchanger designs use heat transfer parameters such as convection heat transfer coefficients, overall heat transfer coefficients, and log mean temperature differences. These calculations are needed for shell and tube and double pipe heat exchangers, as well as other types. Types of Industrial Heat Exchangers There are many types of heat exchangers used…
NDT is the method of detection and measurement of properties or condition of materials, structures, machines without damaging or destroying their operational capabilities. Examples ofNDT are: magnetic dust method, penetrating liquid method, ultrasonic test and radiography. All NDTs are used to detect various types of flaws on the surface of material or internal inclusions of impurities and these techniques are also very useful during preventive maintenance and repair. There are few techniques which do not require any special apparatus and are quite simple to handle and only a moderate skill being required. Some of the applications of NDTs are detecting: (i) surface cracks (ii) material composition (iii) internal inclusions (iv) internal voids and discontinuities and (v) condition of internal stresses.
Bevel gears are useful when the direction ofa shaft’s rotation needs to be changed. They are usually mounted on shafts that are 90 degrees apart, but can be designed to work at other angles as well. The teeth on bevel gears can be straight, spiral or hypoid. Straight bevel gear teeth actually have the same problem…
Cam – A mechanical device used to transmit motion to a follower by direct contact. Where Cam – driver member Follower – driven member. The cam and the follower have line contact and constitute a higher pair. In a cam – follower pair, the cam normally rotates at uniform speed by a shaft, while the…
To assure continuous smooth tooth action, as one pair of teeth ceases action a succeeding pair of teeth must already have come into engagement. It is desirable to have as much overlap as is possible. A measure of this overlap action is the contact ratio. This is a ratio of the length of the line-of-action…
