JNTUA M.Tech 2nd Sem last 10 year 2010-2020 Previous Question Papers (JNTU Anantapur)
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Code: 9D04204
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Max. Marks: 60
Time: 3 hours
M.Tech II Semester Supplementary Examinations January/February 2017
CNC TECHNOLOGY & PROGRAMMING
(CAD/CAM)
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Answer any FIVE questions
All questions carry equal marks
- (a) Explain various elements of machine control unit.
(b) What are the important features of machining center used for higher production? - (a) What are the requirements of axes feed drives in CNC machine tools?
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(b) Explain the arrangement of recirculation of balls in ball screw and state their advantages. - (a) What are the technical considerations that influence the automatic tool changer (ATC)?
(b) List the different materials used in spindles and why AC spindles are selected in CNC machine tool. - (a) Explain the digital absolute encoder used for measurement of position and speed of rotary system.
(b) Write short notes on Moire Fringes. - Write a short note on:
(a) Syncro-resolvers.
(b) Laser interferometer. - The worktable of a positioning system is driven by a lead screw whose pitch = 6.0 mm. The lead
screw is connected to the output shaft of a stepping motor through a gear box whose ratio is 5:1--- Content provided by FirstRanker.com ---
(5 turns of the motor to one turn of the lead screw). The stepping motor has 48 step angles. The
table must move a distance of 250 mm from its present position at a linear velocity = 500 mm/min.
Determine: (i) How many pulses are required to move the table the specified distance.
(ii) The required motor speed and pulse rate to achieve the desired table velocity. - Develop the part program for the following figure shown below, using APT language.
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Ail dimensions in mm
- (a) Discuss any four factors influencing selection of CNC machines.
(b) What do you understand about the maintenance features of CNC systems and state the objectives
of preventive maintenance?
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