ALL YOU NEED TO KNOW ABOUT UNIT AND UNIT CONVERSION !!

A unit of measurement is a definite magnitude of a quantity, defined and adopted by convention or by law, that is used as a standard for measurement of the same kind of quantity.For example, a length is a physical quantity. The metre is a unit of length that represents a definite predetermined length. When we say 10 metres (or 10 m), we actually mean 10 times the definite predetermined length called "metre". 

UNIT CONVERSION 

DIFFERENCE BETWEEN ALIGNMENT AND BALANCING EXPLAINED !!

Alignment and balancing are two words that we hear too often whenever we go for a servicing of our car but very few understand the difference between the two. These are closely related concepts that make sure that you are safe while driving and do not face a mishap on road because of faulty alignment of tires or if the balancing of tires is not perfect. Let us clarify the two concepts so you know what you need when there is any trouble with the wheels of your car.

Balancing

Balancing is necessary as with constant rotation, tire becomes unbalanced. Out of balance tires cause vibration of the vehicle, and at higher speeds, the risk of a mishap greatly increases. Balancing of tires is therefore imperative after every 12-15 thousand miles of run. Balancing also ensures that your tires have a longer life as wear of tires is greatly reduced with balancing.

Alignment

All tires of a new car are perfectly aligned which means that they all point in one direction. This ensures that no tire unduly pushes out or pulls inward causing trouble for the vehicle. If the wheels are perfectly aligned the tires not only have a longer life, you also get better mileage. This also eases pressure on the suspension of the automobile, and in general gives more driving pleasure.

Difference between Alignment and Balancing

Though balancing and alignment are different, they have a bearing on the state of the car which is low mileage and an increased probability of a mishap. Wheel balancing is done on an automated machine which corrects minor imbalances of wheel assembly. On the other hand wheel alignment is a process that ensures that angles of caster, camber and toe are correct. In simple words, it makes the tires point in a single direction.

In brief:

• Alignment and balancing are important for your safety and wear of the tires of your car

• Balancing corrects any imbalance of tires or wheels while alignment ensures that your wheels point in the same direction

• If both wheel balancing and alignment are regularly done, tires have a longer life and you get more mileage from your car

GEAR TERMINOLOGY EXPLAINED !!

Face of tooth:It is defined as the surface of the tooth above the pitch circle is known as face.

Flank of tooth:The surface of the tooth below the pitch circle is known as flank.

Top land:The top most surface of the tooth is known as the top land of the tooth.

Face width:Width of the tooth is known as face width.

Pitch Circle:It is an imaginary circle which is in pure rolling action. The motion of the gear is describe by the pitch circle motion.

Pitch Circle diameter:The diameter of the pitch circle from the center of the gear is known as pitch circle diameter. The gear diameter is described by its pitch circle diameter.

Pitch point:When the two gears are in contact, the common point of both of pitch circle of meshing gears is known as pitch point.

Pressure angle or angle of obliquity:Pressure angle is the angle between common normal to the pitch circle to the common tangent to the pitch point.

Addendum:Distance between the pitch circle to the top of the tooth in radial direction is known as addendum.

Dedendum:Distance between the pitch circle to the bottom of the tooth in radial direction, is known as dedendum of the gear.

Addendum circle:The circle passes from the top of the tooth is known as addendum circle. This circle is concentric with pitch circle.

Dedendum circle:The circle passes from the bottom of the tooth is known as dedendum circle. This circle is also concentric with pitch circle and addendum circle.

Circular pitch:The distance between a point of a tooth to the same point of the adjacent tooth, measured along circumference of the pitch circle is known as circular pitch. It is plays measure role in gear meshing. Two gears will mesh together correctly if and only they have same circular pitch.

Diametrical pitch:The ratio of the number of teeth to the diameter of pitch circle in millimeter is known as diametrical pitch.

Module:The ratio of the pitch circle diameter in millimeters to the total number of teeth is known as module. It is reciprocal of the diametrical pitch.

Clearance:When two gears are in meshing condition, the radial distance from top of a tooth of one gear to the bottom of the tooth of another gear is known as clearance. The circle passes from the top of the tooth in meshing condition is known as clearance angle.

Total depth:The sum of the addendum and dedendum of a gear is known as total depth. It is the distance between addendum circle to the dedendum circle measure along radial direction.

Working depth:The distance between addendum circle to the clearance circle measured along radial direction is known as working depth of the gear.

Tooth thickness:Distance of the tooth measured along the circumference of the pitch circle is known as tooth thickness.

Tooth space:Distance between the two adjacent tooth measured along the circumference of the pitch circle is known as the tooth space.

Backlash:It is the difference between the tooth thickness and the tooth space. It prevents jamming of the gears in meshing condition.

Profile:It is the curved formed by the face and flank is known as profile of the tooth. Gear tooth are generally have cycloidal or involute profile.

Path of contact:The curved traced by the point of contact of two teeth form beginning to the end of engagement is known as path of contact.

Arc of contact:It is the curve traced by the pitch point form the beginning to the end of engagement is known as arc of contact.

Arc of approach:The portion of the path of contact from beginning of engagement to the pitch point is known as arc of approach.

Arc of recess:The portion of the path of contact form pitch point to the end of the engagement is known as arc of recess.