Introduction A brake is a device by means of which artificial frictional resistance is applied to a moving machine member, in order to retard or stop the motion of a machine. In the process of performing this function, the brake absorbs either kinetic energy of the moving member or potential energy given up by objects…
Introduction A clutch is a machine member used to connect a driving shaft to a driven shaft so that the driven shaft may be started or stopped at will, without stopping the driving shaft. The use of a clutch is mostly found in automobiles. A little consideration will show that in order to change gears…
Common terms used : The following terms, in connection with the worm gearing, are important from the subject point of view : 1. Axial pitch. It is also known as linear pitch of a worm. It is the distance measured axially (i.e. parallel to the axis of worm) from a point on one thread to the…
Common terms used: 1. Pitch cone. It is a cone containing the pitch elements of the teeth. 2. Cone centre. It is the apex of the pitch cone. It may be defined as that point where the axes of two mating gears intersect each other. 3. Pitch angle. It is the angle made by the pitch line…
1. Tangential component: The tangential component Ft is a useful component. Because it transmit power. Using the value of Ft , the magnitude of torque and transmitted power can be determined. 2. Radial component: The radial component Fr is a separating force which is always directed towards the centre of the gear. Fr does not…
Gear Terminology The following terms, which will be mostly used in this chapter, should be clearly understood at this stage. 1. Pitch circle. It is an imaginary circle which by pure rolling action, would give the same motion as the actual gear 2. Pitch circle diameter. It is the diameter of the pitch circle. The size of…
Selection Procedure 1. Based on the given data like nature of application, duty etc, select the type of rope 2. Estimate the design load by multiplying the dead weight by three times design factor. 3. Determine the net cross sectional area of the rope by choosing specific strength of wire. 4. Find out the diameter…
INTRTODUCTION Flat Belts are one type of flexible connectors for transmitting power from one pulley to another pulley. Whose center distance is approx. 5-15m Characteristics Of Belt: Types Of Flat Belt Drives: 1. Open belt drive 2. Cross belt drive 3. Quarter turn drive 4. Belt drive with idler pulley 5. Belt drive with many…
Selection of V belts and pulleys Determine your drive requirements. How much power do you need to transmit and at what speed? Introduction: V- Belts are one type of flexible connectors for transmitting power from one pulley to another pulley. Whose center distance is approx. 3M.thier cross section is trapezoidal. The belts are operated on…
Standard progression When the spindle speed are arranged in geometric progression then the ratio between the two adjacent speeds is known as step ratio or progression ratio. Step ratio Preferred basic series Design of gear box 1. Selection of Spindle speed: Find the standard step ratio by using the relations, 2. Structural formula It can…