Assignmnet No III. MP-II

Assignment No III

Manufacturing Processes- II

Date of issue: 9^th March, 2012                                                 Last date of Submission: 23^rd March, 2012

1.    Explain in detail of constructional feature of shaper, planner slotting machine, milling and sawing machine with diagram.

2.    Differentiate the following:

a.    Up-milling and down- milling

b.    Shaper and planner

3.    Write a short note on the following

a.    Mechanism of shaper

b.    Mechanism of planner

c.    Simple, compound and differential indexing

4.    Draw and explain with neat sketch of milling cutter and drilling tool with all its angles.

5.    What are grinders? Explain cylindrical surface and centre less grinders.

6.    Write a short note on:

a.    Broaching machine

b.    Drilling

c.    Operation of boring

d.    Drilling operation

e.    Nomenclature of grinding wheel.

Assignmnet No III ---- Machine Design II

 

Assignment No III

Machine Design - II

Topic: Design of Belt, Rope, Chain, Clutch, Brakes, Bearing, lubrication system and CAD

Date of issue: 9^th March, 2012                                       Last date of Submission: 23^rd March, 2012

1.      It is required to select a flat-belt drive for a compressor running at 720 rpm, which is driven by a 25 kW, 1440 rpm motor. Space is available for a centre distance of 3m. The belt is open type.

2.      Design a dry single plate friction clutch for following data:

P = 25 kW, N = 1440 rpm, Mean radius = 5 x face.

3.      Select a suitable chain drive to transmit 30 kW from an electric motor running at 1200 rpm to a line shaft running at 250 rpm. Motor shaft diameter is 60 mm and the centre distance is approximately 600 mm. Service is l0 hr/day, 6 days a week. Good lubrication condition is expected.

4.      A band brake has to absorb 4.5 k W at 150 rpm. For long life, the maximum pressure between lining and drum is 0.7MPa. The width of band is 50 mm and μ = 0.12. Find the angle of wrap if the brake drum diameter is 300 mm.

5.      A tentative design of a journal bearing result in a diameter of 75 mm and a length of 125 mm for supporting a load of 20 kN. The shaft runs at 1000 r.p.m. The bearing surface temperature is not to exceed75°C in a room temperature of 35°C. The oil used has an absolute viscosity of 0.01kg/m-s at the operating temperature. Determine the amount of artificial cooling required in watts. Assume d/c = 1000.

6.      Discuss the design procedure of lubrication system in transmission system.

7.      Describe the detail design process for computer aided design. Discuss how use of computers assist a designer in each stage of the design process with respect to reducing the time and providing wider spectrum to design solutions.

******