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Theory of machines lab

Theory of machines lab:

Cam Analysis Apparatus

Apparatus is a motorized unit consisting of a camshaft driven by a variable speed motor. The shaft runs in a double bearing. The free end of the camshaft has a facility to mount the cam easily.
The follower is properly guided in gunmetal bushes and the type of follower can be changed according to the cam under test. Graduated circular protractor is fitted co-axial with the shaft. And a Dial Gauge fitted on the follower shaft is used to note the follower displacement for the angle of cam rotation. A spring is used to provide controlling force to the follower system. Weights on the follower shaft can be adjusted as per the requirement. An arrangement is provided to regulate the speed. The apparatus is very useful for testing the cam performance for jump phenomenon during operation. On this apparatus the effect of change of inertia forces on jump action of cam-follower during operation can be observed. It is useful for testing various cam & follower pairs. Three cams and three followers will be supplied with the apparatus. Theses are already hardened to reduce the wear.
SCOPE OF EXPERIMENTATION:
With the help of combination of provided cams and followers following experiments can be conducted:
To plot the n-q (Follower displacement Vs Angle of rotation) curves for different cam follower pairs The follower bounce can be observed by using a stroboscope (Optional) & effect of follower weight on bounce can be studied.
To study the effect of follower weight on bounce.
To study the effect of spring compression on bounce.
The tests can be repeated by changing compression springs, follower weights and cam speed.

Epicyclic Gear Train Apparatus

Product Details:
RPM Measurement &nbps &nbps &nbps: Digital RPM Indicator with proximity switch.
Floor Area &nbps &nbps &nbps 1.5 x 2 m
Electricity Supply &nbps&nbps&nbps: 220 V AC, Single Phase, 0.5 kW
Motor &nbps&nbps&nbps: Variable speed motor, 1 hp
Speed Control Unit&nbps&nbps&nbps: Variable Speed Drive for varying the speed of motor.
Technical Description:
• The Gear Train is any combination of gear wheels by which motion is transmitted from one shaft to another shaft. In epicyclical gear trains, the axes of shafts on which the gears are mounted may move relative to a fixed axis. It is a motorized unit consisting of a SUN gear mounted on input shaft. Planet gears meshes with the annular gear. These planet gears are mounted on a common arm to which output shaft is fitted. Loading arrangement is provided for loading the system and to measure holding torque
Learning Objectives/Experiments:
• To measure epicyclical gear ratio between input shaft and output shaft (Actual and Theoretical).
• To measure input torque, holding torque and output torque.
Control Panel:
• Digital RPM Indicator
• Standard make On/Off switch, Mains Indicator etc.
• Speed Control Unit.

Journal Bearing Apparatus

DESCRIPTION :
The apparatus consists of a plain steel shaft excavated in a bearing and directly driven by a FHP Motor. The bearing is freely supported on the shaft and sealed at the motor end. The speed of the motor is controlled by the speed control unit. One compound pressure gauge is mounted on Bearing to measure the pressure at different position around the circumference. Bearing is free to rotate and can be adjusted at any position of circular scale. The bearing can be loaded by attaching weights to the arm supported beneath it.
EXPERIMENTATION:
• To study the pressure profile of lubricating oil at various conditions of load and speed.
• Plotting the Cartesian polar pressure curves.

Motorised Gyroscope Apparatus

The set up consists of heavy stainless steel disc mounted on a horizontal shaft, rotated by a variable speed motor. The rotor shaft is coupled to a motor mounted on a trunion frame having bearings in a yoke frame, which is free to rotate about vertical axis. A weight pan on other side of disc balances the weight of motor. Rotor disc can be move about three axis. Torque can be applied by calculating the weight and distance of weight from the center of rotor. The gyroscopic couple can be determined.
SCOPE OF EXPERIMENTATIONS:
Experimental justification of the equation T = l w. wp for calculating the gyroscopic couple by observation and measurement of results for independent vibrations in applied couple T and precession wp.
To study the gyroscopic effect of a rotating disc.
bservation of gyroscopic effect of rotating disc.

Static & Dynamic Balancing Apparatus

This equipment is designed for carrying out the experiment for balancing a rotation mass system. The apparatus consists of a stainless steel shaft fixed in a rectangular frame. A set of four blocks with a clamping arrangement is provided. For static balancing, each block is individually clamped on shaft and its relative weight is found out using cord and container system in terms of number of steel balls. For dynamic balancing, a moment polygon is drawn using relative weights and angular and axial position of blocks is determined. The block are clamped on shaft is rotated by a motor to check dynamic balance of the system. The system is provided with angular and longitudinal scales and is suspended with chains for dynamic balancing.

SCOPE OF EXPERIMENTATIONS:
· To balance the masses statically and dynamically of a single rotating mass system.
· To observation of effect of unbalance in a rotating mass system.

UTILITIES REQUIRED:
· Electricity 0.5 kW, 220 V, Single Phase

Torsion Vibration Apparatus

Torsion Vibration Apparatus- Engineering Lab Training Systems The experimental set includes three different torsion bars and two different mass discs. An oil damper makes it possible to reduce the amplitude. The components are straightforwardly and accurately placed in slots of the frame on the vibration system.

Universal Governor Apparatus

The set-up is designed to study the working of different governors normally used to control the speed. It consists of a main spindle, mounted vertically on the base plate. This spindle is driven by a variable speed Motor which is also mounted vertically on the same base plate. Any one governor assembly out of four can be mounted on spindle. The spindle speed is controlled by speed control unit. A graduated scale is fitted to the sleeve to measure the displacement.
SCOPE OF EXPERIMENTATIONS:
Determination of characteristic curve of a sleeve position against speed of rotation for all governors.
To study the effect of varying the mass of the center sleeve in Porter and Proell Governor.
To study the effect of varying the initial spring compression in Hartnell Governor.
To study the determination of characteristics curves of radius of rotation against controlling force (Actual & Theoretical) for all governors.

Whirling of Shaft Apparatus

When the natural frequency of a system coincides with the external forcing system frequency the phenomenon is called resonance. The speed at which resonance occurs is known as critical speeds. These speeds are also called whirling speeds or whipping.
SCOPE OF EXPERIMENTATIONS:
(1) Supported end conditions: Make use of end blocks with single self-aligning bearing.
(2) Fixed end conditions: -Make use of end blocks with double bearing. The guards D1 & D2 can be fixed at any position on the supporting bar frame, which fits on side support F. Rotating shafts are to be fitted in blocks in A &B stands. .