bkharman said:
A tear down will always point out singular "weak" items...
He didn't point out any "weak" items. He's an idiot that doesn't have the first clue about engineering, and tossed in a few fancy words in an attempt to "Baffle with Bullhockey".
For example, if he had the slightest clue about ANY variable speed motors, he wouldn't have even hesitated upon noticing the magnetic pickup on the shaft for a Hall Effect sensor. It's standard on
every variable speed motor for the past several decades!!! It's not new. It's not even a question. Yet he sat there and pondered it as though it may have been present to pick up stray metallic debris (like the magnetic drain plug on a car engine). Idiot!
Then he goes off on the thermal melting point of the plastic housing. Huh? If your motor, any motor, hits 360 degrees, it's already GONE!. But this brainiac didn't even notice the 2 little red wires leading to the embedded thermistor in the motor housing....let alone what a thermistor actually is. The motor controller will shut down the motor long before it ever reaches 360 degrees, because the insulation on the windings can't withstand that high of a temperature.
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He was in awe about seeing balancing grinds on both ends of the rotor? Geez, where did he get his experience, watching someone balance wheels at the local gas station? Even a teenager at the gas station knows you balance both side of a wheel.
What bloody idiot is going to try to remove a rotor without pulling the brushes? I was dumbfounded watching him yank on the motor housing with a screw driver. It wasn't until a minute later that he admitted to not pulling the brushes. Dust boot not withstanding, did he not suspect the brushes would also have to slip past the shaft bearing?
Of course he was surprised to see spiral pinion gears...because he's an idiot. Does he not realize that is a major upgrade from a straight pinion gear? Those aren't cheap to broach! But they mesh a heck of a lot better and are a heck of a lot quieter, and there's a darned good reason why spiral pinon gears have been standard in automotive differentials for the past century.
Think I've been hard on him? Not even close. I'd have that boy in tears if I had the chance to say what I think to him personally. He's that much of an idiot.