Hal, while that is possible, the Alnico magnets used in the H4 and J4 series mags really holds it's magnetism, and while not impossible, it is rare that I see an H4/J4 where the magnet is weak enough to require recharging. On the iron horseshoe mags, absolutely. Over time, they will weaken. Interesting thing about those is, however, that they get better with age, meaning their ability to hold their "charge" gets better with time. So, when you do recharge one, they hold it longer as they get older. It is interesting how that works. to John's point, if anyone would like to understand the different types of iron crystalline structure, and how those different forms, and crystal orientation effect the magnetic properties, ask. Will be happy to share! That is why you can heat a piece of iron or iron based alloy to a certain temperature, and it will lose it's magnetic properties.........until it cools down again. All good stuff.
John, I know EXACTLY what you mean. People get their knickers in a knot pretty quickly. That is part of the problem with these online boards. People can't hear the inflection in your voice.......they can't see the expression on your face. so, people can take things the wrong way really quickly. I have been doing mechanical work for over 40years (first for a living, and for the last 30 years on the side), and I still learn something new in discussions like these each time they happen.
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