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zxkn

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  • zxkn commented on Phil B's instructable Brush Blade for a Weed Trimmer

    I will still stand by my assessment of the safety risk. And sadly yes, there are far too many engineers that suck at engineering. Once had to argue with a co-worker who wouldn’t believe me that en electric motor had stationary stator windings in the outside housing, he was convinced it was just a chunk of solid steel. Sadly academia caters to engineering students who can can perform complex differential equations in their head but don’t understand how a screwdriver works. I see it time and time again. CAD programs are making it worse too. Kids seem to think that if it works in the 3D model it will work in real life. Which is how you get a 4-40 cap screw supporting a 200lbs weight

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  • zxkn commented on Phil B's instructable Brush Blade for a Weed Trimmer

    Im extrapolating from both personal experience and theoretical knowledge, I spent a lot of time using circular saws in my yournger years working in residential construction. Took a lot of unsafe shortcuts to get the job done quicker. Now I’m a practicing engineer, and know better. Fortunately I always managed to avoid serious injury. What happened to me was with a circular saw that I had taken the blade guard off of. Using one hand to lean out off the side of a scaffold while the other was stretched out trying to nip a 2x4 that didn’t get cut off right. (Didn’t want to move the entire scaffold for one cut). It was one of the old school saws with the toggle lock for the trigger. Ended up dropping the thing on a pile of rebar wile it was still running, shattering the blade. While considerab…

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    Im extrapolating from both personal experience and theoretical knowledge, I spent a lot of time using circular saws in my yournger years working in residential construction. Took a lot of unsafe shortcuts to get the job done quicker. Now I’m a practicing engineer, and know better. Fortunately I always managed to avoid serious injury. What happened to me was with a circular saw that I had taken the blade guard off of. Using one hand to lean out off the side of a scaffold while the other was stretched out trying to nip a 2x4 that didn’t get cut off right. (Didn’t want to move the entire scaffold for one cut). It was one of the old school saws with the toggle lock for the trigger. Ended up dropping the thing on a pile of rebar wile it was still running, shattering the blade. While considerably greater forces were involved in my situation, I still urge extreme caution. Those circular saw blades are a very brittle temper. Not at all like a hand saw, or reciprocating saw blade. Even if you went thru the trouble of annealing the blade to eliminate that threat, for every one person like you who is careful enough to use it, the next five are not. So I still wouldn’t suggest it.

    PLEASE DO NOT DO THIS MOD!I don’t mean to offend the author, it was very ingenious and well explained Instructable. But it is NOT SAFE!Aside from the previously mentioned safety issues, all modern circular saw blades are tempered carbon steel. If you happen to hit something hard, you can break off one or more chunks of steel, turning them into the kind of shrapnel that is produced by a grenade or a pipe bomb.Please don’t turn your weed wacker into a pipe bomb!

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