Posted by buickanddeere on May 15, 2009 at 11:24:20 from (216.183.134.54):
They just had a close call a couple of days ago at work. A nylon sling broke when a load being lifted snagged. Crane being used was one of the turbine hall main gantry cranes with a 180ton main hook and the 25ton auxiliary. So they ran the 25ton crane up and down inspecting cables, pulleys etc for obvious damage and non found. Final step was running the crane to the top limit to ensure the emergency over travel lever/switch operation. Up goes the 25ton hook and pulley block which weighs about 500lbs to 45ft above the floor. Hits the emergency stop and keep on traveling. Pow.....the cable snaps and down comes the pulley block and hook. Hit a heavy I-Beam fortunately instead of the turbine steam superheater beside it. Hook and block assembly skidded several feet across the floor while cutting a groove in the concrete. And that folks is why it's best to never stand or travel under or near a suspended load. Broken cable is still dangling from the crane and is full of kinks. The broken ends are bloomed out like a cow's tail.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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