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SLIDER-CRANK APPROXIMATE STRAIGHT-LINE MECHANISM

The lengths of the links of slider-crank linkage ABC comply with the conditions: A͞B=3.12B͞C and C͞D=1.35B͞C. When link 1 turns about fixed axis A, point D of connecting rod 2 describes path q-q which approximates a straight line over the portion corresponding to the turning of link 1 through an angle α≈25°.
$1538$SC,GI$