Comments by "Paul Frederick" (@1pcfred) on "Best Oscillating Multi-Tool Blade? DeWalt, Milwaukee, Bosch, Rockwell, Dremel, EZARC, Imperial" video.

@bassnazi4713 corrosion is a funny thing. You might clean those bits up and they may not corrode from then on. That'd be because of the production of black iron oxide. Which is corrosion resistant itself. There's different kinds of rust. There's the reddish orange stuff and black oxide. But then again you could clean them up and they could get the red cancer too. Check out the iron pillar of Delhi. It is protected by black iron oxide.
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These blades were tungsten carbide. Carbide handles heat very well compared to high speed tool steels. Somewhere on the order of 4 times greater in fact. But with great hardness comes some brittle fragility. As we saw by the teeth broken off on the blades after use. Generally carbide cannot be made quite as sharp as steel either. Although carbide will resist dulling better. Because it is so much harder. Cubic boron nitride (CBN) is the future.
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Heat is the last thing you ever have to worry about with tungsten carbide tooling. When steel is a liquid carbide is still solid for thousands of degrees. So the hotter it gets the better carbide cuts. Because only the steel is getting softer.
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@downhilldaddy9346 studying tungsten carbide alloys is pretty involved. The best answer experts can give is test it and see. They might point you in a particular direction but ultimately only results matter.
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I have a crappy one from Harbor Freight. Which besides the lousy blade change system on it works pretty good. I don't do floors so I am not using a multi-tool all the time. But there's definitely jobs where they're just the ticket. I don't think I'd use a multi-tool more even if I had an expensive cordless one with toolless blade changes. That would certainly be more convenient to have though.
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@howardosborne8647 there are different alloys of carbide. Some less brittle than others are. But a study of the various kinds of tungsten carbide is a dense topic.
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If you're cutting the bottom of floor trim to install flooring removing anything buried in the trim is not practical. And that's what these multi-tools end up doing a lot professionally. It's pretty much all they're good for.
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Carbide is not really affected by heat. It's melting point is over 5,000 degrees. Steel is a vapor at that temperature. Maybe if you were using it on the surface of the Sun? But I'd think you'd have bigger fish to fry then.
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If you're hitting a screw I'd try to go easy and spread the wear on the blade out some too. But if you have to get the job done it is whatever it takes. Hopefully what you're doing is worth more than what a blade costs.
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@P_RO_ a lot of tradesmen do not have much finesse. I remember watching ironworkers putting their gauges in the gang box by throwing them by the hoses. $500 gauge sets. Now does that make what they were doing right? To their credit those gauges were putting up with it. But they were pretty hammered. You weren't reading any of the gauges anymore. They were completely shattered. But the actual regulators did still work.
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@boomertsfx1 I splurged and got the $30 adjustable one. I think it may have been on sale for $24.99 though? I had to modify the box so it was actually useful to store the tool in. I made it open on the big side. But yeah it seems solid when I run it and it hasn't blown up yet so win. Some HF power tools are pretty bad.
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the Milwaukees have an interesting blade design. It's too bad they couldn't point the teeth in alternating directions. But I imagine that might be difficult to manufacture. Still if they could have made it so teeth in both directions engaged on each swing I'd love to see how that works. Perhaps they tried it and it didn't work? The common equal angle pattern is called a farm cut. Which does make sense considering how the tool works.
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@ProjectFarm the newer COB flashlight Harbor is giving away is really nice.
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Carbide is harder than steel is. So you cannot file carbide with a steel file. Trying to file carbide would be a great way to ruin your file though.
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@sherannaidoo2712 I think that may just be you.
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@robj2704 heat is never a factor using carbide. Ever. Steel is machined using carbide dry. The steel chips come off glowing incandescent and it does not phase carbide at all. Just how it is. But fracture on the other hand is the nemesis of carbide.
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Multi-tool blades are too expensive for what they seem to be to me. I wonder why they cost so much? But there's really no good deals on them.
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@ProjectFarm I do not think woodworking blades are going to last cutting nails. Which is why they make these carbide blades. Because I'm sure guys are finding nails in door trim they're cutting to install flooring.
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@jdj3042 people interested in ultimate life. But I doubt speed was a critical factor here.
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Multi-tools are pretty handy for the man who has nothing. They're not particularly great at much but they can be pressed into doing just about anything. Sometimes when you're in a tight spot they're just the answer too. That's where they really shine. When you can't bring any other tool to bear on the work.
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@gteaz I can hand file up to 14 TPI. Past that I'm out. In wood 14 TPI is pretty fine pitch. I think multi-tools are finer though. I'm looking at blade specs now and they're not even saying how many TPI they are.
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