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CHEBYSHEV FOUR-BAR APPROXIMATE CIRCLE-TRACING MECHANISM

The lengths of the links of four-bar linkage ABCD comply with the conditions: B͞C=D͞C=C͞M=3A͞B and A͞D=2.5A͞B. When link 1 turns about fixed axis A, point M of link 2 describes a path of which a certain portion approximates acircular arc.
$683$LW,GI$