Chatted with a retiree at the supply house about those old Otis 211 controllers

He told me they'd just adjust the brake shoes by ear and walk away, and it made me wonder if we overdiagnose everything now with all these test tools.

3 comments

3 Comments

lucaslee12d ago

Honestly that old timer probably had it right. Those guys tuned stuff by feel and sound because that's all they had and their work still held up for decades. Ngl I've watched guys spend an hour with a dial indicator and a multimeter only to end up right where the old guy started. We got so many gadgets now that we second guess the simple stuff like a worn out shoe or a loose bolt. Tbh half the time the problem is just a dirty contactor or a spring that's lost its tension, not some hidden electrical gremlin.

oliver29d ago

Yeah I read somewhere that the guys who built the first computerized car systems said the same thing, half the fixes were just bad grounds or loose connectors but the new guys always reached for the scope first. Take it for what it's worth but the old methods still work for most of what we see day to day.

the_oscar12d ago

Nah I gotta push back on this a bit. That old school feel is great until you're dealing with a modern ECU or a three phase motor that draws 50 amps under load and you're just guessing at what's wrong. I've seen old timers spend three days swapping parts on a CNC machine because they were sure it was a bad relay when it was actually a .01 volt drop across a connector. The gadgets exist for a reason, they catch stuff human ears and hands literally can't feel. That contactor problem you mentioned is obvious if you know what you're looking at, but a hidden hairline crack in a solder joint that only shows up at operating temp is why we have thermal cameras and scopes.