Machine Tool Design — Summer 2022

Differentiate between hydraulic transmission and mechanical transmission.

List types of feed boxes and explain any one with neat sketch.

Prove that the loss of economic cutting speed is constant over the whole range of spindle speed in GP series.

Write advantages of geometrical progression.

Explain hydraulic step less regulation of speed and feed rates.

Explain the step by step procedure for constructing structure diagram for speed box.

Draw speed diagram and layout for a six speed gear box having the following structural formulae:

2(3) 3(1) (ii) 2(1) 3(2) The output sppeds are 160 rpm minimum and 1000 rpm maximum. The motor shaft speed is 1440 rpm.

Give functions of machine tool structures and their requirements.

Explain the factors affecting stiffness of machine tool structure and methods of improving it.

Explain in details static and dynamic stiffness for machine tool structures.

With suitable figure show various profiles of slide ways.

Illustrate anti friction guideways.

Give requirement of Protecting devices for slide ways and explain various types of protecting devices with neat sketch.

What is spindle? Explain functions of spindle unit.

Enlist the material for spindles.

Explain the design of rolling friction power screws.

what are the commonly used bed sections and wall arrangements.Also state its applications.

Explain the factors affecting on design of sliding-friction power screws.

The rolling contact ball bearing are to be selected to support the overhung countershaft. The shaft speed is720 r.p.m. The bearings are to have 99% reliability corresponding to a life of 24 000 hours. The bearing is subjected to an equivalent radial load of 1 kN. Consider life1 adjustment factors for operating condition and material as 0.9 and 0.85 respectively. Find the basic dynamic load rating of the bearing from manufacturer's catalogue, specified at 90% reliability.

What are the aesthetics considerations applied to design of machine tools.

Write a note on machine tool chatter.

Explain the adaptive control system for machine tools.

Explain simple centralized control system for speed changing.

What are the methods to reduce instability in machine tools.

Explain the ergonomic consideration applied to the design of control members of machine tools.