Design and Analysis of a Modified Scott Russell Straight-Line Mechanism for a Robot End-Effector Y. The Scott-Russell (SR) amplifying mechanism is designed for a cutting tool to amplify the PA displacement and carries out high precision for the motion control system. Get Geometry in Modern Life Books now Available in PDF, ePub and Kindle.
Scott russell mechanism pdf download#
Point P of the mechanism moves very nearly along line AB. View Homework Help - 237-1193-1-PB from BUSINESS 101 at IIT Bombay. Download or read online Geometry in Modern Life written by John Scott Russell, published by Unknown which was released on 1878. Also, dimensions AC, BD, CP and PD are all equal. This is a four bar mechanism, where, PCD is a single integral link. Thus point P always moves along a straight line perpendicular to BA as shown in the fig.1.41.Īpproximate straight line motion mechanism: A few four bar mechanisms with certain modifications provide approximate straight line motions.
Scott russell mechanism pdf Pc#
To prove product of BE and BP is constant.īut since BC and PC are constants, product of BP and BE is constant, which is the condition for exact straight line motion. Hence these three points always lie on the same straight line. Therefore points B, E and P always lie on the perpendicular bisector of CD. Triangles BCD, ECD and PCD are all isosceles triangles having common base CD and apex points being B, E and P. To prove B, E and P lie on same straight line: Point P of the mechanism moves along exact straight line, perpendicular to BA extended. The designed six-DOF parallel positioning system is shown in Fig. Here, AE is the input link and point E moves along a circular path of radius AE = AB. Scott-Russell mechanism or a four-bar mechanism for levers. Scott-Russell Straight-Line Mechanism (exact) 7 Crank-Shaper Quick-Return Mechanism Whitworth Quick-Return Mechanism Drag-Link Quick-Return Mechanism. Peaucellier exact straight line motion mechanism:įig.1.41: Peaucellier exact straight line motion mechanism Locus of pt.C will be a straight line, ┴ to AE if, is constant If point B (fig.1.40) moves on the circumference of a circle with center O and radius OA, then, point C, which is an extension of AB traces a straight line perpendicular to AO, provided product of AB and AC is constant.įig.1.40: Condition for exact straight line motion
It consists of a fixed member and moving member P of a sliding pair as. Condition for exact straight line motion: Exact Straight Line Motion Consisting of One Sliding Pair-Scott Russells.
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