JEMS INDUSTRIES

Chinchwad, Pune, Maharashtra

The unit is designed to provide visual demonstration and measurement of longitudinal and transverse pressure distribution over Michell Thrust Bearing. Students can vary speed, gap and viscosity of oil. It gives visual demonstration of cavitaion. The unit consists of a belt moving on two identical pulleys driven by variable speed d.c.motor. The belt passes through a oil tank and carries oil film along with. This oil passes through tilting pads and develops pressure, which is measured by manometer through pressure tapings on tilting pad. Different types of pads can be used.

Specifications:

• Drive Motor - 0.5 HP, 1, 500 RPM, variable speed D.C.Motor with speed controller.
• Tilting Pad -
  1. Convergent Type - Rectangle
  2. Convergent Divergent Type - Rectangular.
• Multitube Manometer.
• Manometer for cavitation demonstration.
• Oil Tank - 0.5 X 0.2 X 0.2 m approx.
• Loading arrangement on pads.

Experimentation :

1. Determination of pressure development.
2. Plotting pressure Variation curve in longitudinal & Transverse direction of a pad for various speeds.
3. Demonstration of cavitation phenomenon.

Service Required :

• 230 V., A.C. stabilised power supply.

The apparatus consists of a closed box with Perspex front and back, inside which the nozzle and the vanes are fitted. Vane is mounted on a lever, which is provided with initial balancing weight and sliding weight for balancing the impact force. The jet is clearly visible through the Perspex sheets. The apparatus is useful for demonstration of force exerted by impact of a jet on a vane and comparison of theoretical force and actual force can also be made.

SPECIFICATIONS :

1. Vanes G.M.- a) Flat b) Hemispherical each one
2. Lever arrangement for measurement of actual force exerted by jet with vane balancing and jet force balancing weights.
3. The assembly is housed in a box with Perspex front and back.
4. Measuring tank and stop watch ( will be supplied only for conventional & individual Recirculating units.)

The apparatus enables the students to experimentally balance a rotating mass system and to verify the analytical relations. The apparatus consists of a 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 on shaft and 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 positions of blocks are determined. The blocks 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.

Specifications

• Drive Motor-FHP, Universal Motor.
• Balancing Weights-4 No.s with different mass for varying unbalance.
• Cord & Container with stell balls for relative weight measurement.

Range of Experiment

• Static balancing of system using steel balls.
• Dynamic balancing of a simple rotating mass system.
• Observation of effect of unbalance in a rotating mass system.

Service Required

• 230Volts, AC Single Phase stabilised power supply.
• Space- .75m X 1.5m area at working height.

An instruction Manual will be supplied along with unit.

1. Apparatus consists of supply and receiving chambers of 100mm dia and 600 mm long with gauge glass scale fitting for the measurement of total potential head. The two chambers are provided with control valves and are connected with an inter linking duct made of thick transparent prespex sheet of smooth variable converging-diverging cross section. The transparent duct has suitable pressure tappings, which are connected to glass piezometer tubes. These tubes are mounted on a suitable stand with graduated scales to read directly the potential head. The complete unit is supported on a strong iron stand. A stopwatch and an M.S. collecting tank of size 30 liters. Fitted with a gauge glass scale fitting, a drain valve and a bend is provided to measure the actual flow rate.

1. A 220 volt AC, 0.5 HP, single phase monoblock ISI pumpset with suitable pipe fittings, strainer foot valve, and switch is provided to supply water to the test rig.

1. A sump tank of size 200 liters with suitable drain is provided to store the water. A strong iron stand fitted with wheels supports the complete test rig. The unit is moveable. All tanks are provided with FRP lining for total rust protection.

Specifications:

• M. S. tank size 0.7 x 0.7 x 0.3m with a drain plug as a storage.
• A hollow ship model with balancing weights.
• Circular weights 4 in numbers to be used as cargo or warship loads.
• Tilting weights 4 in number for balancing.
• A pendulum & graduated are for measuring tilt angle.

Range Of Experiment:

• Determination of metacentric height of warship.
• Determination of metacentric height of cargo ship.

Service Required :

• Suitable table to mount the equipment else it can also be kept at the ground level.

1. Apparatus consists of an M.S. supply tank of size 100 liters with baffles and screens for steadying the water and a provision to fix the interchangeable notches. A hook/pointer gauge with suitable fittings is provided to measure the water level. A stop watch and an M.S. collecting tank of size 90 liters., with a gauge glass scale fitting, a drain valve and a bend are provided to measure the actual flow rate.
2. The following set of 5 notches of size made of 10 gauge brass sheets are provided to conduct the experiments
   1. Rectangular Notch.
   2. Trapezoidal (Cippolotti) notch.
   3. V notch (90 deg).
   4. Broad crested weir.
   5. Ogee weir.
3. A 220 volt AC, 1.0 HP, single phase monoblock ISI pumpset with suitable pipe fittings, strainer foot valve, and switch is provided to supply water to the test rig.
4. A sump tank of size 250 liters with suitable drain is provided to store the water. A strong iron stand fitted with wheels supports the complete test rig. The unit is moveable. All tanks are provided with FRP lining for total rust protection

The unit is designed to study various governors, normally used to control the speed. The unit consists of a main spindle driven by a variable speed motor mounted on a base plate. The spindle is driven by belt & pully system. The optional governor out of four governor assemblies can be mounted on a spindle. The spindle speed can be controlled by speed control unit provided. A graduated scale is provided to measure the displacement of sleeve.

The centre sleeve of portal and proell governors incorporates a weight sleeve to which weights may be added. The Hartnell governor provides means of varying spring compression level. This unables the Hartnell Governor to be operated as a stable or unstable governor.

The governor speed is increased in steps to give suitable sleeve movements possible. The speeds and displacements are recorded. The results may be plotted as curves of speed against displacements. Further tests are carried out by changing variables.

Specifications

• Drive Unit - D.C.Motor, 1/4 HP, 1500RPM.
• Speed Control Unit.
• Belt and Pully system to give spindle speed 100 to 500 RPM.
• Governor Mechanisms with springs and weights for following Governors -
  1. Watt Governor.
  2. Porter Governor.
  3. Hartnell Governor.
  4. Proell Governor.

Range of Experiment

• Determination of characteristic curve of sleeve position against speed of spindle.
• For Porter and Proell Governor Effect of varying mass of sleeve.
• For Hartnell Governor Effect of varying spring compression.

Service Required

• 230V.A.C.Single phase stabilised supply.
• Handheld Tachometer.
• Rigid Floor Space - 1.5m X 1.5m.

The apparatus is designed to study the cam profile and performance of Cam and Follower system. It consists of a shaft supported in ball bearing and driven by speed D.C.Motor. Various types of Cams can be mounted on this shaft. A push rod assembly is supported vertically and various types of followers can be attached to this push rod

1. The test rig consists of a GI pipe line fitted with a set of gunmetal venturimeter and orificemeter of size 25mm(1"), and of d/D Ratio = 0.6. The flow meters are provided with pressure tappings with quick change over cocks. A differential manometer (without mercury) is provided to measure the pressure difference across the venturimeter/orificemeter to be tested. The pressure tappings are connected to a common manifold which in turn is connected to the manometer. A strong iron stand is provided for supporting the pipe lines. A stop watch and an M.S. collecting tank of size 90 liters. with a gauge glass scale fitting, a drain valve and a bend are provided to measure the actual flow rate.
2. A 220 volt AC, 0.5 HP, single phase monoblock ISI pumpset with suitable pipe fittings, strainer foot valve, and switch is provided to supply water to the test rig.
3. A sump tank of size 200 liters with suitable drain is provided to store the water. A strong iron stand fitted with wheels supports the complete test rig. The unit is moveable. All tanks are provided with FRP lining for total rust protection.

The apparatus consists of a variable speed D.C.Motor, Driving pulley and Driven pulley of equal diameter. The pullies 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:

• D.C.Motor - 1 HP, 1500 RPM, variable speed.
• Driving & Driven pullies of equal diameters.
• Brake drum along with spring balance.
• Flat Belt of fixed length of following materials -
  1. Fabric Belt.
  2. Canvas Belt.
  3. Rubber Belt.
• Belt tightening arrangement.
• Speed Controller unit.
• Two Channel digital RPM Indicator.

Experimentation :

1. To measure power transmitted with varied belt tensions and plotting graph of (T1 - T2) Vs. (T1+T2)/2 ie 'Tension Characteristics'.
2. To measure percentage slip at fixed belt tension by varying load on brake drum and plot graph of (T1-T2) Vs. percentage slip ie. 'Slip Characteristics'. Finding a creep zone from graph.
3. To measure belt slip speed and observe the limiting value of load at constant speed when the slip just starts.

Service Required :

• 230 V.A.C. stabilised power supply.

The apparatus consists of a transparent glass cylinder at the top of which two condensers are fitted. Steam is admitted in cylinder from bottom. One of the condenser is with chrome plated surface for drop wise condensation and other is with natural finish to promote film wise condensation. Water is circulated through the condensers from common inlet. The transparent glass cylinder allows visulisation of condensation process. A rotometer is provided to measure the water flow rate through condenser. A small steam generator is provided to produce necessary steam. A digital temperature indicator is used to measure temperatures at various locations. Students can determine heat transfer coefficients in drop and film wise condensation process.

Specifications:

• Steam Generator with 1.5 Kw heater.
• Condenser - 2 No.s - 150 mm long, 20mm dia. Material copper, one with chrome plating.
• Rotometer - 10 - 100 lph for cooling water.
• Pressure Gauge - 1 No., 0 - 2.1 Kg/Cm2.
• Multychannel Digital Temperature Indicator.
• Flow Control Valves for water, steam & drain.

Service Required :

• 230 V.A.C. stabilized supply with earthing.
• Floor space - 1.5 m X 1 m at working height.
• Water supply about 4 lpm at constant head.

The apparatus consists of a base upon which bearing holders and drive motor can be mounted. Different bearings can be fitted in bearing block to have different end conditions, such as, both end fixed, one end fixed, one end etc. free. A variable speed motor along with speed controller is provided to drive the shaft. The unit is useful to demonstrate the phenomenon of Whirling of Shaft with single rotor. As this test is destructive, after the test shaft can not be used again, hence this unit only demonstrates the principle.

The apparatus consists of a plain shaft encased in a bearing and directly driven by a small motor. The bearing is freely supported on the shaft and sealed at motor end. The motor speed is precisely controlled by control unit. The bearing contains twelve equispaced pressure tappings around circumference and four along the axis. All tappings are connected by light flexible plastic tubes to the manometer so that the pressure head of all sixteen points can be observed at a time. The bearing can be loaded be attaching weights to the arm supported beneath it.

Experiments :

1. Observation of the pressure profile at various conditions of load and speed.
2. Plotting the cartesian and polor pressure curves.
3. Plotting the theoretical Sommerfield curves.

Service Required :

• A.C, Single Phase .230 V. stabilized power supply.
• Control Panel for speed control.
• Manometer Board(Sixteen Tube)
• Oil recommended - SAE 30/40.