Set No. 1

Code No: RR412003

in

IV B.Tech I Semester Supplimentary Examinations, May/Jun 2009 MACHINE TOOL DESIGN (Production Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ 1. (a) Classify the gear and thread cutting machines and discuss its applications.

ld .

(b) Compare relative merits and demerits of Shaping, Planning and Milling Machines for processing the flat surfaces. [8+8] 2. Explain any two types of the following machines with simple sketches. (a) Single spindle automatic Screw Machines (b) Multiple spindle Machine Tools.

[8+8]

Velocity Range (RV ) Diameter Range (RD ) Range Ratio (RN ) Productivity Loss.

uW

i. ii. iii. iv.

or

3. (a) Define the following terms used in stepped drives:

(b) What are the kinematic advantages of G.P. Series (for layout of speeds in machine tools) (c) What is the difference between structural diagram and Ray diagram? [8+4+4] 4. (a) Explain with reasoning the steps to follow for the design of a feed Gear box. (b) Describe the Norton gearbox with neat sketches.

[8+8]

nt

5. What is the role of anti friction guide ways and compare the following: (a) Cast iron guide versus hardened guides.

(b) Hardened guides versus linear motion guides [16]

Aj

(c) Lead screw versus ball screw.

6. (a) Illustrate any three types of spindle bearing arrangements and discuss their applications, merits and demerits. (b) Sketch and explain the cross section of Engine Lathe Tail stock.

[8+8]

7. (a) List out the applications of hydraulic and Pneumatics actuators and controls in the machine tools. (b) Describe with neat sketches any three types of Hydraulic pumps and their applications in Machine Tools. [8+8] 8. Write short notes on any three of the following: 1 of 2

Set No. 1

Code No: RR412003 (a) Properties of fluids (b) Multi position valves. (c) Positive displacement Pumps. (d) Power pack design

[16]

Aj

nt

uW

or

ld .

in

⋆⋆⋆⋆⋆

2 of 2

Set No. 2

Code No: RR412003

in

IV B.Tech I Semester Supplimentary Examinations, May/Jun 2009 MACHINE TOOL DESIGN (Production Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ 1. (a) Explain the operational features of self-feed tapping operation and give the Pillar and spindle details of Radial Drilling Machine.

[8+8]

ld .

(b) Sketch and explain the main specifications of Center-less Grinder.

2. (a) Compare the Guides and Drive elements for the General purpose, Special Purpose, and NC Lathes. (b) What is the difference between the Special Purpose Transfer lines and NC Machining Centers? [8+8]

or

3. (a) How do you select range of speeds in the design of gear boxes. (b) What is support- drive? Explain.

[8+8]

nt

uW

4. (a) Calculate the production rate in components per hour for a mild steel 170 BHN turning to a length of 100mm from a blank dia.50mm. Assume the cutting speed and feed rates for HSS single point tool and the stock is removed in three steps (roughing; semi finishing and finishing). Draw the tool lay-out for each step of machining. (figure 4a)

Aj

Figure 4a (b) Explain Hydraulic systems of achieving step less regulation of speeds in machine tool drives. [8+8]

5. (a) Explain what are the structural and other factors causes the inaccuracy Ovality and taper on the Turning Job in the Lathe? (b) Illustrate with neat sketches, What is the effect on the Job accuracy if Tool setting is not exactly at the center of Spindle? [12+4]

6. (a) Compare the tapered roller bearing (TRB) and angular contact ball bearing for spindles (b) What are preloading of a bearing and what type of bearing arrangement requires preloading? [8+8] 1 of 2

Set No. 2

Code No: RR412003

7. (a) List out the applications of hydraulic and Pneumatics actuators and controls in the machine tools. (b) Describe with neat sketches any three types of Hydraulic pumps and their applications in Machine Tools. [8+8] 8. Write short notes on any three of the following:

in

(a) Properties of fluids (b) Multi position valves. (c) Positive displacement Pumps.

[16]

Aj

nt

uW

or

⋆⋆⋆⋆⋆

ld .

(d) Power pack design

2 of 2

Set No. 3

Code No: RR412003

in

IV B.Tech I Semester Supplimentary Examinations, May/Jun 2009 MACHINE TOOL DESIGN (Production Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ 1. (a) List out any two attachments for the lathe and justify its function for processing the work.

ld .

(b) Describe the facing lathe with neat sketches and specify its main features. [8+8] 2. Explain any two types of the following machines with simple sketches. (a) Single spindle automatic Screw Machines

[8+8]

or

(b) Multiple spindle Machine Tools.

3. (a) Outline the procedure for determining the upper and lower speed limits of a center Lathe. (b) Explain the following in connection with the optimum design of a Gear Box:

uW

i. Ray Restriction ii. Stage Restriction, and iii. Maximum Nodal Sum (Σd)

[8+8]

4. (a) Explain with reasoning the steps to follow for the design of a feed Gear box. (b) Describe the Norton gearbox with neat sketches.

[8+8]

nt

5. For a NC machine select the suitable machining elements and discuss its functionalities: (a) Structure

(b) Guide and guide ways (c) Lubrication

[16]

Aj

6. (a) Write two main differences between Hydrostatic and Hydrodynamic bearings. (b) Design a full hydrodynamic babbit bearing for a journal of diameter 80 mm rotating at 2000 rpm. Determine its load capacity if the average bearing pressure is not to exceed 8kgf/ cm[S] 2. Check the bearing against excessive heating if the maximum permissible bearing temperature is 700C and the maximum ambient temperature = 400C. Assume certain data whenever necessary. (c) Write four advantages of antifriction bearings compared to plain sleeve bearings. [4+8+4] 7. Compare the following feed applications; 1 of 2

Set No. 3

Code No: RR412003 (a) Lead screw with gearbox and induction motor (b) Lead screw with hydraulic motor (c) Lead screw with Pneumatic motor (d) Ball screw with gearbox and DC motor.

[16]

in

8. Sketch and explain the following: (a) Pressure relief valve (b) Pressure compensated valve

[16]

Aj

nt

uW

or

⋆⋆⋆⋆⋆

ld .

(c) Piston type relief valve

2 of 2

Set No. 4

Code No: RR412003

in

IV B.Tech I Semester Supplimentary Examinations, May/Jun 2009 MACHINE TOOL DESIGN (Production Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ 1. (a) List out any two attachments for the lathe and justify its function for processing the work.

ld .

(b) Describe the facing lathe with neat sketches and specify its main features. [8+8]

2. Explain the difference between Turret and Capstan Lathe and explain with neat sketch the Constructional features of Capstan Lathe. List out its advantages. [16]

or

3. (a) Explain the advantage of selecting G.P for arranging Machine tool gear box speeds. And explain the applications of DC.Spindle Motors (b) How do you design the ray diagram? Explain.

[8+8]

4. (a) Depict Meander’s Mechanism employed in Feed Boxes and write the expressions for obtaining different transmission ratios.

uW

(b) Compare stepped and stepless regulation of speeds with respect to cost, productivity loss and ease of operation. (c) Depict a Face Plate Variator with two friction discs and explain how the actual transmission ratio can be found. [8+4+4] 5. A bed subjected to torsional loading is constructed as a closed box-type structure, while a bed subjected to bending is constructed as an I-section. Why? Give mathematical proof to support your conclusion. [16]

nt

6. (a) Illustrate with neat sketches the spindle arrangement of engine lathe. (b) What type of Bearing arrangement is preferred for heavy rough turning operation? [8+8]

Aj

7. (a) List out the applications of hydraulic and Pneumatics actuators and controls in the machine tools. (b) Describe with neat sketches any three types of Hydraulic pumps and their applications in Machine Tools. [8+8]

8. Write short notes on any three of the following: (a) Properties of fluids (b) Multi position valves. (c) Positive displacement Pumps. 1 of 2

Set No. 4

Code No: RR412003 (d) Power pack design

[16]

Aj

nt

uW

or

ld .

in

⋆⋆⋆⋆⋆

2 of 2