Post by Marathonman on Apr 10, 2021 6:10:44 GMT -6
Bad news on my part, epoxy of the core was a failure and will need to be redone. it seems that even though the epoxy has a cure time of 24 hrs it was still not ready when i began to grind and buff it. this is what cause the winding core separation which in turn caused the inductance to plummet. so again i am at square one having to redo the core. this time i will use machinable epoxy that of course will be heat tolerant.
R&D can be a bitch some times and this is just one of them. the core is just fine and when finished will excel in it;s purpose but the failing of the epoxy was not expected.
machinable epoxy will be ordered tonight and i will keep everyone updated as to the status. in the mean time i received a very old variac for the electronic thread that you can see shortly.
Post by Marathonman on Jan 13, 2022 12:00:32 GMT -6
I am rethinking my strategy on my part G core. after a few failures on the winding adhering to the core i am reaching out for some professional advice on attachment of the winding's. i am also considering having a new core made like the original core i had that was one inch longer that was dumped in the trash by sorry ex house mates. I am staying with the C core for my mechanical version but will use torodial core for my electronic version. Regards, Marathonman
Post by Marathonman on Jan 21, 2022 14:02:12 GMT -6
For a quick update i am stripping my part G again and will be rewinding it using high temp machinable epoxy. i am worried that the core i purchased from Bridgeport magnetics is delaminating on the edges which means piss pore quality. if i do purchase from them again i will need a guarantee that it is built using quality adhesives not shit quality. Regards, Marathonman
Post by Marathonman on Nov 23, 2022 9:15:19 GMT -6
I kinda took a long hiatus on the mechanical to rethink my strategy. What I came up with is in the process of grinding down my windings on the core a massive amount of heat was produced and thus the adhesive material gave way. SO to avoid this problem I am using machinable epoxy but instead of grinding it down I will have it CNC'ed down to avoid the heat issues. I found a local company what will do it really cheep and they said it will take no time at all to do it. The key here was I purposely introduced myself to everyone and explained what i was doing and the whole lot of them were excited lol!
So like the electronic version I will be finally moving forward with the mechanical also.