week_17
Machine design
This week our group will make a XY plotter drawing robot. With drawing robot, you can draw images on white board and also you can clean images by robot. We reference machine which we found on instructable . We have modified the original project and increased the black panel cleaning function.
My work in the team is to modify the mechanical structure and increase the demand for black panel cleaning. So, I focused on changing the structure of the gondola file. The original structure is as follows:
At first, I designed three schemes. The first is to use two steering gear to switch from each other to switch the pen and black panel. The second and the third are to add structure to the original machine to complete the eraser function. Therefore, our team started from the simple and adopted the first plan.
The fist plan as follow:
The second plan as follow:
The third plan as follow:
Then I designed the design on UG according to the sketch of the first scheme, and the size of the design part was measured according to the actual mapping and the mapping of the original document.
I used sketching, stretching, mirroring, etc.
The size of the black plate of this design needs to be cut, the length is 60mm, the width is 48mm, high is 15mm. The black plate is attached to the board with double faced adhesive tape.
The design of the rubbing parts is not reasonable and the adjustment is repeated. I added a connecting board with a laser cut. Add a 5mm u-groove on the modified component, and the connecting board and the modified parts are connected by 5mm bolts and can be slipped up and down. At the same time, I added the overall size of the modified parts (150mm). The second edition is designed as follows:
Then I 3D printed the parts, I found a very serious problem, the steering gear part is not considered clearly, need to dig a slot to put the steering gear flat.
Modify the following:
I used two M4 bolt holding pens
Two M4 bolts fix the connecting plate, as shown in the figure.
The final structure is shown below.