From your picture it looks like your Helicoil is in plenty deep. If you've broken of the tang and the bolt won't thread in deep enough I would run a tap the size of your bolt through the helicoil and down below into the remaining old hole. It looks like the bolt you took out only ripped out the...
https://www.kittstools.com/product5444.html I've bought a few of these sets from Kitts Tools. They are cheaper offshore drills but come in a nice Huot case, so far I actually haven't had any problems with the drills, but if you do you can always replace the commonly used sizes with more...
I usually put direct bury aluminum in conduit, just did a 100 amp 250 feet to a barn in 1.25 conduit. Instead of pulling the wire through at the end I slide each piece of conduit onto the wire and then glue them together. Saves a lot of pulling and you can get away with smaller conduit.
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The last one I did I used my air hammer. I slid a socket over where the air hammer met the rod to keep everything together. Worked great
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We've always used straight #2 diesel fuel from the farm tank. It cleans great and it doesn't really evaporate so it acts as rust preventer after you take the parts out.
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I've got a very similar setup, mines branded as a JC Penney, but it was made by Delta. My table saw is a 9" blade which is pretty hard to find, but 8 1/4" blades work just fine.
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I agree with 2oolhound, a 1 inch solid shaft shouldn't need any real balancing as long as it's actually straight. I've made several tube drive shafts including the one on my daily driver and I've never needed to balance any of them since I made sure they were straight before welding.
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Graphite brick are actually fairly common in tool and die work for using in sinker EDM machines, you machine the graphite electrode to the opposite profile of the metal part you are making and then the EDM machine slowly arcs away the metal to leave the desired shape. This has nothing to do with...
The last barn we built used 28' sheets on the roof, we just rolled it into a u shape and tied it with 2 pieces of bailing twine, worked great and it's easy to just cut the twine after it's on the roof as opposed to using ratchet straps.
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They are actually quite common, that's typically the head size for 5/8" bolts. Used all over the place on farm equipment.
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The best way I've found for cutting to width is to score the line with a utility knife and then bend back and forth on that line. It will break on the score line and leave a good strait edge.
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I found a hf needle scaler for $5 in a pawn shop. I've been happy with it, but I mainly use it for chipping weld slag.
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If you have a bunch of them to clean i would definitely find someone that had a hot water pressure washer you could borrow, it will make your life much easier.