GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER- III (Old) EXAMINATION — WINTER 2019
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Subject Code: 131903 Date: 07/12/2019
Subject Name: Manufacturing Process-I
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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Q.1 (a) How are lathe machine tools classified? Differentiate between standard purpose and special purpose machine tools? 07
(b) What are the advantages of having a hollow spindle in the headstock of lathe? 07
Q.2 (a) Explain any four commonly used attachments on lathe. 07
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(b) Compare Up Milling and Down Milling? Explain Dove-tail milling with neat sketch. 07
OR
(b) Estimate the time required machining a cast iron surface 250 mm long and 150 mm wide on a shaper with cutting-to return ratio of 3/2. Use a cutting speed of 21 m/min, a feed of 2 mm/stroke and a clearance of 25 mm. The available ram strokes on the shaper are: 28, 40, 60 and 90 strokes/min. Also, determine MRR assuming depth of cut as 4 mm 07
Q.3 (a) With a neat sketch show the different parts of a saddle type turret lathe. Differentiate between capstan and turret lathe? 07
(b) What are the differences between compound indexing and differential indexing? Explain the relative merits. 07
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OR
Q.3 (a) With a neat sketches. Define “drilling,” “core drilling,” “counter drilling,” and “step drilling.” 07
(b) Explain briefly “Twist drill nomenclature” with neat sketches. 07
Q.4 (a) With a neat sketch explain feed mechanism of a shaper. 07
(b) Write briefly about broaching machines and its operations with neat sketch? 07
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OR
Q.4 (a) Explain briefly a Jig boring machine with a neat sketch. 07
(b) Explain with a neat sketch about a horizontal milling machine. 07
Q.5 (a) Write short note on Alignment test carried on Drilling machine. 07
(b) Describe the working principle of surface grinding. 07
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OR
Q.5 (a) How are slotting machine specified and mention few specifications? 07
(b) Write a short on “Band Sawing Machine.” 07
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