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Chris Albertson
开云体育The bug story just might, maybe be relevant. ? As the story goes a big machine was broken. ?It was a computer but in those days computers still had moving mechanical parts and a moth got caught in the mechanism. ? At the time they thought it was funny because an actual real-life “bug” was the cause of the bug. ? Obviously, the term must have been in use, or it would not have been a joke. ? Hooper removed the moth and taped it to a sheet of paper and make some kind of informal display of it. ?I’ve seen photos of the dead moth tapped to the paperI doubt there is an actual insect in the lathe causing the problem. ?Something has either come loose, broken or burned up. To “debug” any problem with a complex machine there is a dumb way and a smarter way. ? Usually, the dumb way works. ?You simply replace parts more or less based on random hunches until the problem goes away. ?Your first hunch is usually correct and replacing the fuse fixes it. The smarter way is called “divide and conquer”. ? First, you somehow cut the system in half and then figure out which half is NOT broken, the fault must be in the OTHER part. ?But where in the other part? ?Just do it again. ?Keep cutting the failed part into subparts and so on. ? It is usually hard to prove failure, but proving a part works is usually easy. ? (When a test shows a defect you always suspect that maybe it is an incorrect test method.) ? The first cut I would make is to disconnect the motor’s power leads and test the motor with a DC power supply. (Old PC power supplies are worth keeping around) ?If it spins correctly the fault is not the motor or any of its parts like the brushes. ?If the motor works then then the fault is someplace between the motor power cable and the AC wall socket. ? The obvious place to cut again is to remove the AC cable from the controller PCB. Using this process you can narrow down to (say) a single MOSFET component on the controller board. As for how to take the lathe apart. ? The web-based view is only marginally OK. ? It is poor compared to a real copy of Fusion360, which is free for non-professional use and worth getting if you are into designing and building machinery. ?But you can see even in the web view where the cover is and how many screws hold it.
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