Automatic Bead Stringing Machine​
Testing
The testing of this project will take place during the Spring 2020 quarter at Central Washington University. The purpose of the testing method for this project was to free the work effort and low the labor cost. The finished device must be:
Weight no more than 20 pounds
Easy to operate and use. It has 5 steps to install.
Production rate 150 bead string per minute. The diameter of beads at 8mm
Cost no more than $400 manufacture
Method/Approach​
Using timer to count the beads go on string per minute and 5 minutes
Assembly machine in 5 steps within 15 minutes
Using weight scale for weight test
Result
Base on the requirements and test plan, the machine meets all requirements
The total weight of the machine is 16 lbs.
The machine assembled in 5 basic steps and took 15mins to install the process
Production rate per minute at 372 beads
The machine cost $350 for manufacturing
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Base on the requirements and test plan, the machine meets all requirements. In the first test, the total weight of the machine is 16 lbs. This test is done by using a weight scale. In the second test, the machine assembled in 5 basic steps and took 15mins to install the process. Third test, the production rate purpose to check how many beads will go through the machine in 1 minute. This test will be tested by hand (traditional way) and by the machine. 3 trials of 1 minute of bead threading both by hand and by machine show the machine dominating. The average result was 17 beads per 1 minute after 3 trials by using hand. However, the result was higher when used machine with the average after 3 trials at 372 beads. The percentage change between the two methods is 2195%.
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However, during the test process, there were some issues occurred. Time to assemble the machine took longer than planned due to: the gear system needed to set up perfectly to run, electric wires needed to attach to the machine’s frame. During the production test, when put too many beads in the funnel. Beads always stuck in the funnel. They could not run to the roller system. This is a major effect on the result of the testing. The connection point between the roller and funnel needs to be fixed in order to get a better result for the next tests.
