15. Mechanical design¶
This week was based on developing a machine design that can possess “X,Y,Z” direction movements in group.
Process Planned.¶
It took two days in defining an idea that is well executable for a machine design work. After couple of brainstorming session it was decided to make a parallel plotter arm with different mechanism. Then the biggest challenge was to understand the mechanism behind the plotter.
MECHANISM STUDY.¶
The system has 3 connected linked arms that are free to rotate at joints. The linkages no 4 and 5 are rigidly connected as one piece. These two together form the elbow.These linkages are made of weightless material that it operates in cantilever position from the central shaft during operation. The pen holder is placed at the tip of the link 5 (Seen in the picture below). Linkages no 3 is connected directly to the pulley erected in the central shaft. The main rotation of the arm is controlled by linkage 3. Linkage no 1 is connected at an offset to the pulley using a small linkage no.2(Later this was directly incorporated with the pulley itself).Linkage no 1 controls the rotation of the elbow linkages 4 and 5 indirectly. These connected linkages behave in such a way that at any point a parallelogram in closed connection is formed by them. The desired position of the pentip can be achieved by calculated rotations of the connected linkages no 3 and 1.
Testing the MECHANISM¶
Then we planned to test the mechanism by using pvc sheet so that we can study the working of mechanism in detail.
WORK¶
The work has been recorded on the group project page and the link has been given below