Difference between qrr and crank and slotted lever mechanism
Answers
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 Whitworth quick return motion also has a slotted link and sliding block as shown in figure 2 under. This mechanism is used on planing machine, which is quite large and on slotting machine which are small. With the slotting machines a single point tool is fixed to the front of the slider and is used for cutting fine grooves and key-ways. With planing machines the slider is the worktable on which the workpiece is secured. This moves with slow forward and quick return motion beneath a stationary single point cutting tool.