---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Wed 04/05/17: 3 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 04:37 AM - Re: MGL CHT probe (Kent or Jackie Ashton) 2. 08:43 AM - Re: Lithium Webinar (Robert L. Nuckolls, III) 3. 05:08 PM - Re: old B and C SD-8 Dynamo failure (Mark Todd) ________________________________ Message 1 _____________________________________ Time: 04:37:07 AM PST US From: Kent or Jackie Ashton Subject: Re: AeroElectric-List: MGL CHT probe > On Apr 4, 2017, at 11:42 PM, Jeff Point wrote: > > This seems like a pretty cheeseball setup. =46rom what I know of K-type thermocouples (mostly from reading the 'Connection) that wires must be silver soldered to the probe and to each other. Or, am I mistaken and is this a reasonable setup? What you have will probably work just fine but yes, the high dollar thermocouples usually silver-solder the wires to the copper ring and incorporate a support (pic), however they=99re amazingly expensive. Silver-soldering is a good skill to learn and does not take much more than a propane torch and the proper materials. Here are a couple I made as an experiment (2nd pic). They use copper sparkplug gaskets and a piece of stainless welding wire as the support. A =9Cresist=9D is a material applied to the parts that you don=99t want the solder to flow onto. Wite-out makes a pretty good resist. The tricky part is jigging the parts while you heat them. This place has all the supplies and there are many Youtube videos. https://contenti.com Time or money, take your choice. :-) -Kent ________________________________ Message 2 _____________________________________ Time: 08:43:35 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Lithium Webinar At 05:34 PM 4/3/2017, you wrote: >Because there is interest on this list I thought it might be >appropriate to post that there is an upcoming EAA Webinar on the >subject of lithium batteries: > >http://pages.eaa.org/WBN2017-05-31LithiumBatteriesExplained_LP-Registration.html Thanks for the heads-up! I'll check it out . . . Bob . . . ________________________________ Message 3 _____________________________________ Time: 05:08:43 PM PST US Subject: Re: AeroElectric-List: old B and C SD-8 Dynamo failure From: Mark Todd > Are the windings smoked? Do they smell bad? I thought there was a burnt smell from the dynamo before I pulled it off the engine. Here at my bench, is smells fine. Now I wonder if that burnt smell was from something else in that 2300+ hour engine compartment. > > The DC resistance of this product is less than > 0.25 ohms. So if you had a shorted turn or two, > you could not resolve it with jelly-bean test > equipment. The magnets are ferrites . . . rather > brittle. You probably couldn't get them loose > without breaking them up. OK. > > >> Bob, if you wanted to look at this dynamo for some reason, I'll be happy >> to mail it to you. I suspect you've got much better things to do than >> 'paleo-forensics' on this dated item. >> >> Mark > Actually, I would like to see it. I have > a drive stand running that fits the SD8 > and I'm equipped to test/inspect it in > detail. Getting a close up look at a sample > with this kind of service on it would be > illuminating. > > Send the rectifier/regulator too. I'll > get them checked out and repaired/replaced > as needed. > > > Bob . . . I'll get the dynamo and regulator off to you within the next couple of days, using your PO Box 130 address unless you instruct otherwise. Thanks for looking at this. If it checks out OK, I guess it'll mean that I missed a faulty connection somewhere that got cleared up with the replacement. After all these years of flawless service, I can't decide whether I'm rooting for the dynamo or me! 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