Description
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Motorised Governor Apparatus
The unit consists of a base upon which the bearing holders and driving motor are bearing can be fitted in a holders to end conditions for test shafts, viz. Both end fixed and one end free, one end fixed. A Variac provided control of driving motor. The unit demonstrates the phenomenon of whirling of shafts with single rotor. As the test is destructive, after the test cannot be used, hence the unit only demonstrates the principle.
However, results obtained are closer to theory, as compared to those with bare shafts. Also, It can be demonstrated that, after passing whirling speed, shaft again starts running true.
SPECIFICATIONS OF MOTORISED GOVERNOR APPARATUS:
1.Test shaft – 4.75 mm, 6.35 mm and 7.9 mm – 2 each.
2.Bearing to provided end conditions, (a) Both ends fixed, (b) One end fixed and one end free.
3.Drive motor 1/8 HP, 1500 rpm with control arrangement.
4.The whole unit is mounted on a sturdy base.
5.Rotor for each shaft of suitable size.
6.A technical manual accompanies the unit.
SERVICES REQUIRE FOR MOTORISED GOVERNOR APPARATUS:
Floor space area of 2m. X 1m. at working height.
230V, 15 A, AC electric supply connection.
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Whirling Of Shaft Apparatus
The unit consists of a main spindle driven by a variable speed motor. Three different governor assemblies can be mounted over the spindle. A with pointer measures the lift of the governor. Students can calculate characteristics of governor at and compare their performance viz. Sensitiveness, stability, governor effort etc.
SPECIFICATIONS OF WHIRLING OF SHAFT APPARATUS:
1.Governor assemblies – Hartnell, porter & propel governor assembly one each with rotating weights. 2.Variable speed FHP D.C. motor to drive the main spindle. 3.Sliding weights for porter & proell governor. 4.Scale & a pointer to measure governor lift. 5.Spring & Spring compression adjustment arrangement. 6.A technical manual accompanies the unit.SERVICES REQUIRE FOR WHIRLING OF SHAFT APPARATUS:
1.230V, 5A, AC supply connection. 2.Bench area of 0. 75 x 1m. at working height.
Motorised Gyroscope Apparatus
The apparatus consists of a rotor mounted in bearings. This rotor is free to rotate about
(i) Its own axis i.e. axis of spin.
(ii) Axis of precession.
(iii) Axis of gyroscopic couple.
The rotor is connected to the variable speed motor. The weight of the motor is balanced by another weight, which is on either side of the rotor. By putting weights on the weight platform torque can be supplied to rotor, which is also called gyroscopic couple.
SPECIFICATIONS OF MOTORISED GYROSCOPE APPARATUS:
1.Rotor dia. 250mm free about 3 axis of rotation driven by variable speed motor. 2.Dimmerstat to control the motor speed. 3.Stopwatch to measure the angular speed about the axis of precession. 4.Weights – 0.2 kg, 0.5 kg and 1 kg. 5.A technical manual accompanies the unit.SERVICES REQUIRE FOR MOTORISED GYROSCOPE APPARATUS:
1.220v stabilized AC supply with earthing connection. 2.Bench area – 0.5 x 0.5m at working height. 3.Tachometer for speed measurement (can be supplied at extra cost).
Static Dynamic Balancing Apparatus
This equipment is designed for carrying out the experiment for balancing a rotation mass system. The apparatus consists ofa 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.
EXPERIMENTS OF STATIC & DYNAMIC BALANCING APPARATUS:-
1. To balance the masses statically and dynamically of a single rotating mass system. 2. To observation of effect of unbalance in a rotating mass system.UTILITIES OF STATIC & DYNAMIC BALANCING APPARATUS:-
Electricity 0.5 kW, 220 V, Single PhaseTECHNICAL SPECIFICATION OF STATIC & DYNAMIC BALANCING APPARATUS:-
1. Drive Motor -- FHP Motor, variable speed, with speed controller 2. Balancing Weight -- 4 Nos. of Stainless Steel with different sized eccentric Mass for varying unbalance 3. Rotating Shaft -- Material Stainless Steel 4. The whole Set-up is well designed and arranged in a good quality painted Structure
Slip Creep Measurement Apparatus
The apparatus consists of a variable speed D.C. Motor, Driving pulley and Driven pulley of equal diameter. The pulleys are mounted on input shaft (Motor shaft) and output shaft. The driven pulley can slide on the base with bearing block to change initial tension in belt. Brake drum is mounted on output shaft helps to measure power output. The motor speed is varied by dimmerstat. A two channel RPM Indicator is provided to measure speeds of driven and driving pullies respectively.
Specifications:
1.D.C. Motor – 1 HP, 1500 RPM, variable speed. 2.Driving & Driven puilies of equal diameters. 3.Brake drum along with spring balance. 4.Fiat Belt of fixed length of following materials – (i)Fabric Belt (ii)Canvas Belt. (iii)Rubber Belt. 5.Belt tightening arrangement. 6.Speed Controller unit. 7.Two Channel digital RPM Indicator. 8.Stroboscope.Experimentation –
1. To measure co-efficient of friction between pulley material and different belt materials. 2. To measure power transmitted with varied belt tensions and plotting graph of (T1 – T2).Tension Characteristics. 3. To measure percentage slip at fixed belt tension by varying load on brake drum and plot graph of (T1-T2) Vs.percentage slip.i.e. Slip Characteristics. Finding a creep zone from graph. 4. To measure belt slip speed and observe the limiting value float at constant speed when the slip just starts.Service Required:
1.230 V.A.C. stabilized power supply 2.Space -. 1.5m x 1.5 m.
Interference Undercutting
The board shows the demonstration of this phenomenon of Interference and Undercutting. When we rotate the teeth in anticlockwise direction, as the teeth is undercut is gives us a smooth working. When we give a rotation in clockwise direction, we can observe that the rack tip will be resisted by the tooth flank thus giving interference.
Generation Of Involute Gear Tooth Profile
This board illustrates the process of cutting of involutes Gear Teeth, by use of rack type cutter It consists of 3 white acrylic discs A, B, C. having pitch circle diameter 450 mm, 300 mm & 200 mm respectively. A gear tooth profile with module 25mm can be traced out on a peace of paper placed between disc and cutter. An affect of Interference and Undercutting on correct profile of gear tooth can be studied from the profiles traced.
Grinder Tool Dynamometers
This a simple set up to study the various forces resolved during grinding operation, designed by sharp techno system for demonstration purpose for the students undergoing tool desing study. This unit works on octagonal ring method using strain gauge as a sensor. A two channel digital force indicator facilitates to measure both forces simulteniously.
FEATURES:
1.Rigid in construction & compact unit. 2.Assessment of cutting forces by giving due consideration to various parameters like depth of cut, material, speed and feed . 3.Eassy in handling & Digital force indicators to measure two forces simultaneously.SPECIFICATIONS:
1.Mechanical sencing unit with two octagonal rings and strain gauges. 2.Two channel digital force indicator with balancing potentiometers and polycarbonate front plate. 3.Range of force measurement in coordinate direction – 0 to 200 kg. 4.Over all size of mechanical unit – 300 x 300 mm.SERVICE REQUIRED:
1.Necessary surface grinding machine. 2.230 volts, single phase, 50 Hz stabilized power supply.
Drilling Tool Dynamometers
This is a armed wheel type strain gauge drill tool dynamometer designed to measure thrust and torque during drilling operation. This Dynamometer is suitable for drilling a hole up to 25mm size in mild steel. With this Dynamometer students can study the change in these force by varying speed, cut and feed
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