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2003 Course Machine Tool Design

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Total No. of Questions : 12] P1395 [Total No. of Pages : 3 [3764] - 172 B.E. (Production Engineering/Sandwich) MACHINE TOOL DESIGN (2003 Course) Time : 3 Hours] [Max. Marks :100 Instructions to the candidates: 1) Attempt one question of each unit from Section - I and Section - II. 2) Answers to the two sections should be written in separate books. 3) Draw neat diagram wherever necessary. 4) Assume suitable data, if necessary. SECTION - I Unit - I Q1) a) b) Design a six-speed gear box for a machine tool having a minimum speed 60 rpm, G.P ratio = 1.55, speed of motor = 1500 rpm. Draw the best possible Structural diagram, ray diagram, speed chart and gear layout. [14] Discuss the considerations of variator design. [6] OR Q2) a) b) c) For flat disc drive ,derive the equation for frictional torque. Discuss the designs features of feed gear box with Norton drive. Write a Short note on Ball variator. [8] [8] [4] Unit - II Q3) a) b) What the design criteria for beds? How these are applied to for welded and cast beds. [8] Why stiffness is important consideration in machine tool structure? How stiffness is improved explain with figures. [7] OR P.T.O. Q4) a) b) What are the functions of machine tool structures? Show the different types of cross sections used for machine tool beds and columns. [8] Discuss bed materials along with required properties. [7] Unit - III Q5) a) Estimate the total error in pitch of a lead screw working on sliding friction and show that it could be expressed as [10] P2 1 1 + 2 D 2 Where 1 = QP / AE Q - Axial load, P - Pitch, b) A - Cross section area, D - Effective diameter, - Efficiency Write a note on aerostatic slide ways. [5] OR Q6) a) b) Discuss briefly the merits and demerits of Recirculating power screw in comparison to conventional lead screw. State its specific field of uses and application. [7] Discuss the design consideration in guideways. [8] SECTION - II Unit - IV Q7) a) b) c) Explain the design consideration of machine tool spindle [8] Explain different methods for preloading of ball bearing. [6] Describe the different types of bearing employed in machine tools. Give the importance of each. [6] OR Q8) a) b) c) Describe the various elements of a spindle unit used in a drilling machine. Draw the neat sketch of the arrangement. [7] Explain optimum spacing of support in spindle for good rigidity. [8] State and explain the functions of machine tool spindle. What are the desirable features of spindle units. [5] [3764]-172 2 Unit - V Q9) a) What do you understand by regenerative chatter in machine tool? State its causes and effects. [8] b) How vibrations of boring bar are damped. [7] OR Q10) a) Explain how electrical breaking system is used for control in machine tool. [8] b) Compare hydraulic control system with mechanical control system with reference to performance, cost ,reliability considerations. [7] Unit - VI Q11) Write a short note on following: a) Table feed control in planer machine. b) Layout of machine tool by matrices. c) Feed back devices used in CNC. [15] OR Q12) a) Explain how and where a retrofitting is done in a old lathe machine tool. [8] b) What are the design considerations of Unit head machine tool. [7] TTT [3764]-172 3

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