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CAD/CAM & Automation (April 2010)

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Total No. of Questions : 12] P1612 [Total No. of Pages : 5 [3764] - 141 B.E. Mechanical & Mechanical Sand Wich CAD/CAM AND AUTOMATION (2003 Course) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) Answers to the two sections should be written in separate books. 2) Neat diagrams must be drawn wherever necessary. 3) Figures to the right indicate full marks. 4) Use of logarithmic tables slide rule, Mollier charts, electronic pocket calculator and steam tables is allowed. 5) Assume suitable data, if necessary. SECTION - I Q1) a) b) c) Given a point P = (2, 4, 8) and using the homogeneous representation calculate P* if P is translated by d = 3i 4j 5k and then scaled uniformly by s = 1.5. [6] Show that the midpoint of a line transformed to the midpoint of the transformed lines. [5] What does mapping mean? What are the various applications for which mapping can be used? [5] OR Q2) a) b) c) A triangle PQR represented as P(30, 20), Q(90, 20) and R(30, 80). It is to be scaled by a factor of 0.5 about a point A(50, 40). Determine the composite transformation matrix and the new coordinates of the triangle. [6] Show that : [5] i) Translation is commutative. ii) Mirror and two-dimensional rotation about Z-axis are not commutative. What is meant by geometric transformation? What is the need for it? What is its role in model construction and viewing? [5] P.T.O. Q3) a) b) c) Find the equation and endpoints of two lines, one horizontal and the other vertical. Each line begins at and passes through a given point and is clipped by another given points. [6] Write a short note on Order of Continuity . [6] Explain different solid manipulations and its importance. [4] OR Q4) a) b) A cubic spline curve is defined by the equation P(u) = C3u3 + C2u2 + C1u + C0, 0 < = u < = 1. Where C3, C2, C1 and C0 are the polynomial coefficients. Assuming these coefficients are known, find the four control points that define an identical Bezier curve. [8] Explain the effect of the Multiple Control Points and Degree of Bspline Curve on its shape. [8] Q5) a) In the figure below, a load P = 60kN is applied as shown. Determine the displacement field, stress and support reaction in the body. Take A = 250 mm2 and E = 20 kN/mm2. [8] b) Write a short note on Automatic and Semi-automatic mesh generation with an illustrative example. [6] c) Explain, with suitable examples, the plane stress and plane strain condition. [4] OR Q6) a) For the plane truss composed of the three elements shown in the fig, subjected to a downward force of P = 10,000 lb applied at node. Determine the x and y displacement of the node and the stresses in each element. Let E = 30 106 psi and A = 2 in2 for all elements.[10] [3764]-141 2 b) Derive an expression for the element stiffness matrix of the two noded truss element. Also show the element stress calculations. [8] SECTION - II Q7) a) A CST element is defined by nodes at I (30, 40), J(140, 70), and K(80, 140) and the displacements at these nodes are (0.1, 0.5), (0.6, 0.5) and (0.4, 0.3) respectively. Determine the displacement the natural coordinates and the shape function at point P(77, 96) within the element. [8] b) Explain shape function of CST element. Also explain the physical representation by area coordinates. [8] OR Q8) a) b) Explain how symmetry is used in FEA with applications. [8] Discuss the Problem Modeling and Boundary Conditions for the following cases : [8] i) A hollow cylinder of length L subjected to an internal pressure, one end of the cylinder is fixed and other end is free. ii) Press fit of a ring of length L and internal radius r onto a rigid shaft of radius (r + ). [3764]-141 3 Q9) a) b) What are advantages and limitations of Automation? [6] Write a manual part program for finishing a forged component as shown in the figure. Assume the speed and feed on the turning centre as 450 rpm and 0.4 mm/rev. assume 1mm material is to be removed radially from external diameter. [10] OR Q10)a) b) Q11)a) b) c) Draw the layout of a typical FMS system and explain main components of FMS. [6] Write an APT part program to machine the outline of the geometry shown in fig. Assume the component to be 5mm thick. The post processor cell statement is MACHINE/ABM, 1. The end mill is used is 10mm in diameter. Assume spindle speed as 1000 rpm and feed as 0.3 mm/rev. [10] Write a note on new trends developing in CNC/DNC technology. [6] Write a short note on Magnetic Grippers used for robot. [6] What do you understand by automation strategy as regards the manufacturing industry? Explain with suitable example. [6] [3764]-141 4 OR Q12)a) Explain the steps in manufacturing on a CNC system. [6] b) What are various configuration of a robot? Explain with suitable sketches showing work envelope. [6] c) Write a short note on Robot Applications. vvvv [3764]-141 5 [6]

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Additional Info : 2003 Course
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