Technical Drawings!
My experience with technical drawings and GD&T!
Senior Capstone - Vibram Transparent Inclinable Walkway
I was heavily involved in the hands-on fabrication phase, serving as the right-hand to our machining lead, Charlotte. I had to measure each bar in CAD and provide drawings to everyone, showing how long to cut the bars and where the holes should be located. An example is shown on the right!
Sensacore Autosampler
Project
I had to create drawings for every single sheet metal and acrylic part after I design them or modify them in Solidworks. This entailed over 40 drawings in total for every iteration of the product. Unfortunately, I cannot show the drawings here because it is proprietary, but I am allowed to display the outer view of the CAD. The drawings were really tedious since they had to have dimensions for the flat pattern of the part and also the bends, so they usually required 4-5 different views with a lot of dimensions on it for lengths, bend angles, and more.
Five Axis Robot Arm!
I had to make over 60 pages of drawings for this project! I had to talk with the machinists about machineability and tolerances of all the parts, and I had to make multiple revisions to adhere to DFM principles.
The machine shop usually machined to a tolerance of 0.1mm, and so many of my dimensions use the bilateral tolerance of 0.1mm. For pins and pushings, I used transition fits and clearance fits to make assembling the parts easier in the future. I utilized H7 and k6 or e6 tolerances for the pins and holes, depending on the purpose of the part. I used a little bit of GD&T with datums and callouts, such as angularity and concentricity, but it made the parts more expensive, so I did not use them much.
Peristaltic Pump Project
There are only 3 parts that need to be machined: the frame, the ball bearing holder, and the lid. I created drawings for each part, and had them custom-machined out of acrylic. The tolerance was not very tight; I used a standard 0.1mm bilateral tolerance that the machine shop used. I planned to use acrylic for the parts to allow for a clear appearance for the pump. These drawings are a little old, so please go easy on me!
