Here you can find my documents for the Spring 2016 iteration of 2.77: Fundamentals of Precision Product Design as taught by Prof. Alex Slocum.

PUPS #9
Write-up

Error Budget for Scissor Actuator

FRDPARRC for Scissor Actuator

Bill of Materials for Scissor Actuator

Final Solidworks Model for Scissor Actuator

Seek and Geek
My Seek and Geek for this week is a tool I've recently used a few times in the Edgerton Student machine shop. One of the things that inevitably happens in the shop is that the mills go out of tram. This problem is annoying because tramness is something people often assume (and then realize too late that it isn't the case) and also because tramming the head of a mill is a somewhat cumbersome process. Fortunately, Edgerton has a neat little tool (link) called a "spindle square" that features two dial indicator mounted ~4 inches apart, with a 1/2" shank in the middle to mount it in a collet in the spindle. The dial indicators can be quickly zeroed to one another using a surface plate, and then all you have to do is adjust the head of the mill until the dial read the same thing. It is so much quicker than using a single dial indicator in an adjust-and-check fashion. Good work, SPI.


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