On Friday, 3 June 2022 20:47:56 EDT Dan Bloomquist via Emc-users wrote: > gene heskett wrote: > > >From an oldtimer who is also a CET: > > Look any fuses in the original supply over, either with an ohmeter, > > replacing anything over 2 ohms, or with a very strong magnifying > > glass, looking for stress fractures of the fusible element. > > > > Old fuses have expanded a wee bit and sagged, until they break a > > hairline fracture but it looks like a good fuse at a cursory glance. > > Any fuse that serves in a circuit passing more than about 25% of its > > rating will eventually fail while looking good, but its fractured > > and broken on a real close examination. > > > > An argument could be made (if the fuse is in the line power part of > > the circuit) to place an ne2 neon lamp, in series with a 56k 2 watt > > fireproof resistor across any fuse holder found to be hiding such a > > failure, so if it breaks again 10 years down the log, the ne2 will > > tell you its failed by lighting up. But it won't be passing enough > > current to be a threat to a human. > > Hi Gene, > Thanks. As you see I had created a stupid short. The 24v supply is a > 1.2 amp open frame, old school analog. I was seeing 5 volts on that > rail so it was really putting out. The rest of the drop was on some 30 > feet of #22. I think it is #22. Good supply just going into current > limiting and not dying. It was hot! For all I know, it was putting out > several amps, and I'm guessing it was with 5 volts showing. > > I have a big redo planed for that mill. I'm running 2.6 on it. I'll > move to 2.9 and get that touch off actually working. Such a pain to > set up with a test tool and feeler gauge. And those flanges, best we > could do was put a pointy tool in and set it over the middle. Amazing > how well you can see down to ~<.001. > Automatic Touch off is great, and you can write it right into your gcode if you write your own.
If you want the latest, although that might scare a production shop, but I'm just an old fart hobbiest at 87, so I run an updated master on all my stuff, these guys are good, I've had 2 problems in close to 15 years of running master from the buildbot. Both fixed the next day. > > Best, Dan. > > > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > . Cheers, Gene Heskett. -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author, 1940) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
