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Not necessarily, Slash. Often, the first thing that happens is the +5 goes to a voltage regulator to bump the V+down to say, 3.3V or so. IF you see two wires to ground or to each other, consider that one may be a shield.
Awesome job - I'm envious. I'd love to try one of these sometime. Check out www.woodgears.ca . Matthias has a gear calculator, and a program (for sale) that will calculate and print full-size gear patterns. He also has a bunch of videos demonstrating wooden gear making and a ton of cool projects he's built with wooden gears.Also, regarding the AC synchronous motors - when I was a kid, I learned an old trick for noisy motors. Most of these motors are sealed, and contain grease, which, over time collects in the bottom of the motor housing. If your motor starts to get real noisy, take it out (if you can) and rotate it 180 degrees and run the motor for a few hours before putting it back. If your design permits, you might even be able to rotate the motor in place.
You need to look into so called match solder - lo temp solder that will melt from the heat of a lighter. Also available are solder/shrink connectors - bits of heat shrink tube with a solder preform inside. put one of these over two pieces of wire to be spliced, and heat. The solder melts, and the tube shrinks, soldering the wires and sealing the joint. Amazon has them : https://www.amazon.com/dp/B01ILSEDWI/ref=asc_df_B0...I learned about these from my mechanic!
Circuit Board Design Class
PCB Concepts and Materials
Assembling the Board
Laying Out the Board
Well, you noted that CFM is a measure of flow, and while meaningless for vacuum, it does bear on how fast it will pump down to a desired level. Add while 27 inches may not be a great vacuum, for many applications it is perfectly acceptable. We are not all trying to simulate deep space, or build a tokamak; for home science experiments, or stabilizing/dyeing wood blanks, 27 in/Hg is just fine.I'd be more concerned about repeated use without proper cooling/lubrication. My understanding was that many A/C refrigerants have a lubricating component - or maybe was that mostly for auto A/C, I haven't messed with that since they used real Freon.
Nice work!I'd like to add that most calipers have a fourth mode of measure - called "step". The left edge of the jaws are ground coplanar to each other at 'zero'. If you place the caliper such that the left edge of the fixed jaw is square to your reference surface, you can measure the height of a feature with the edge of the moving jaw. You could, for example, measure the depth of your miter slots this way. The depth rod is good for inside depth, the 'step' is good for outside measurement.
I work in a professional electronics lab. My coworkers run the gamut from surgical-suite clean to tornado victim disorganized. Because we often work on highly restricted projects AND have frequent visitors, one particular coworker intentionally keeps his bench SO disorganized it is impossible for a casual observer to know exactly what he is working on.
50 Star Salute to Winter