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GUJARAT TECHNOLOGICAL UNIVERSITY
DIPLOMA ENGINEERING – SEMESTER – IV • EXAMINATION – WINTER - 2016
Subject Code: 3341901 Date: 17-11 - 2016
Subject Name: Manufacturing Engineering II
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make Suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
4. Use of programmable & Communication aids are strictly prohibited.
5. Use of only simple calculator is permitted in Mathematics.
6. English version is authentic.
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Q.1 Answer any seven out of ten. 14
1. Write various methods of machining.
2. State functions of chip breakers.
3. Define lip clearance angle with reference to twist drill geometry.
4. List different types of drill.
5. Write two advantages of multi spindle automate.
6. What is the role of cutting fluid in machining process?
7. State two main functions of quick return mechanism.
8. List usual types of ram drive mechanism of slotting machine.
9. State the function of knee and arbor of a milling machine.
10. Explain longitudinal feed and cross feed with reference to lathe.
Q.2 (a) Explain the relation between cutting speed and tool life. 03
OR
(a) State the advantages and limitations of continuous chip. 03
(b) Compare orthogonal cutting with oblique cutting. 03
OR
(b) Explain thread cutting operation on lathe machine. 03
(c) Draw three view of single point cutting tool showing its main angles. 04
OR
(c) How machining time is calculated on lathe machine? 04
(d) Explain face plate and angle plate as job holding devices. 04
OR
(d) Write specifications of lathe machine. 04
Q.3 (a) Draw block diagram of open side planer. 03
OR
(a) Draw neat sketch of radial drilling machine and show main parts. 03
(b) Compare planer machine with shaping machine. 03
OR
(b) Write uses of work holding devices used in shaping machine. 03
(c) A drilling operation is to be performed with a 12.7 mm diameter twist drill in a block of magnesium alloy. The hole is a blind hole at a depth of 60 mm. The cutting speed is 25 m/min and the feed is 0.30 mm/rev. Determine metal removal rate (MRR) during the operation after drill bit reac hes full diameter. 04
OR
(c) List attachments used on milling machine and write main purpose of each. 04
(d) Explain drill designation. 04
OR
(d) Write need and benefits of tool holders for carbide inserts. 04
Q.4 (a) Explain compound indexing on milling machine with suitable example. 03
OR
(a) Draw block diagram of plain milling machine. 03
(b) Draw sketch and write use of 1. T-slot cutter 2. Side milling cutter 04
OR
(b) Explain up milling and down milling. 04
(c) Explain open and cross belt drive mechanism of planning machine with neat sketch. 07
Q.5 (a) A peripheral milling operation is performed on the top surface of rectangularwork piece which is 400 mm long by 60 mm wide. The milling cutter which is 80 mm in diameter and has 5 teeth overhangs the width of the work piece on both sides. If cutting speed = 70 m/min, chip load = 0.25 mm/teeth, depth of cut = 5 mm, determine maximum metal removal rate during the cut. 04
(b) Differentiate between turret lathe and basic center lathe. 04
(c) Write influences of cutting variables on surface finish and mass production. 03
(d) Write working principle and applications of single spindle automates. 03
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