Hi Jon, Well now that I've had a winter of no rivers flowing through the shop I can finally approach a renovation that will drop the moisture further and generally make it a nicer place to work. Sometime this summer I think.
I'm going to go with the concept that somehow high moisture corrosion like I've been experiencing in the shop this winter has some caused the problem. I have a photo from last April that shows pristine wires. A photo from November shows the white wire is discoloured but I hadn't noticed that the last time I had my head in the cabinet. So here's the latest status report: I washed the connector pins and the area around the connector with flux remover and a soft tooth brush. Then first scraped and finally with 600g wet/dry made the pins look nicer than the ones on the resistor end. Washed and cleaned again with flux remover. Blow dry. I then cut back some of the wires that had discoloured and stripped, tinned and flattened them. This is temporary. No point in wasting ferrules if the driver was shot. Used a connector from the G320X driver I have here. Then cover back on and all together into the machine. The Z axis works perfectly. The drive doesn't get any warmer than it did before. As in I can hold my hand on the heatsink and it's barely warm. The connector also does not feel warm nor do the wires. I finished the milling project I started yesterday. Tonight I'll pull it out again, remove the solder from the two badly pitted joints and re-solder them since they are now suspect. Thanks for everyone's comments. John > -----Original Message----- > From: Jon Elson [mailto:[email protected]] > Sent: April-06-20 3:42 PM > To: Enhanced Machine Controller (EMC) > Subject: Re: [Emc-users] Gecko Failure > > On 04/06/2020 03:36 PM, John Dammeyer wrote: > > I have a Raspberry PiZeroW reporting this: > > T=15.6C,RH=55.0%,DP=6.6C And yet I've had more surface > > rust on everything this year than over the last 10. Go > > figure. There shouldn't be any moisture condensing on > > anything with a dew point at 6.6C. And yet... John > No, the tin problem does NOT require condensing levels of > humidity. RH 55% is bad enough. > And, it probably is just like that in my basement sometimes, > too. Some tin-plated connectors have enough > contact pressure to hold this issue at bay, some don't. I > have real Phoenix Contact connectors on > my PPMC boards, and I still had the one that supplies power > to the PPMC motherboard get a high resistance contact some > years ago. The PPMC kept working fine at 4 V, but the > encoders started dropping counts. It took me a long time to > discover that one. it was so subtle, but parts were coming > out the wrong size (too big). > > Rust on steel definitely doesn't require condensing, either. > > Jon > > > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
