Difference between crank and slotted lever and whitworth quick return mechanism
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Crank slotted lever mechanism :-
The slotted link mechanism is used for converting the linear motion of a slider into rotational motion or vice-versa. This mechanism is generally found on shaping machines where single point cutting tool is mounted on the front of the slider or ram, in a hinged tool post. The tool cuts on the slow forward stroke and lifts over the workpiece on the quick return stroke. The slotted link rocks from side to side, driven by the sliding block on the bull wheel.The bull wheelrotates at a constant speed, the angle through which bull wheel rotates on the forward stroke is greater than the angle through which it rotates on the return stroke. This imparts the slow forward and quick return motion to the slotted link and slider. The distance of the sliding block from the centre of the bull wheel can be altered to vary the length of stroke of the slider.
The slotted link mechanism is used for converting the linear motion of a slider into rotational motion or vice-versa. This mechanism is generally found on shaping machines where single point cutting tool is mounted on the front of the slider or ram, in a hinged tool post. The tool cuts on the slow forward stroke and lifts over the workpiece on the quick return stroke. The slotted link rocks from side to side, driven by the sliding block on the bull wheel.The bull wheelrotates at a constant speed, the angle through which bull wheel rotates on the forward stroke is greater than the angle through which it rotates on the return stroke. This imparts the slow forward and quick return motion to the slotted link and slider. The distance of the sliding block from the centre of the bull wheel can be altered to vary the length of stroke of the slider.
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