On Friday 09 November 2012 18:45:02 Sven Wesley did opine: > 2012/11/9 Jason Burton <[email protected]> > > > As someone who designs automation cells and tooling for robots and > > machine tools easily big enough to kill you, wireless pendants would > > freak me out for safety reasons. > > > > I spec "wireless" sensors for tooling pretty regularly. That said, I > > only trust them for non-safety related tasks. > > > > Wireless is great for tasks with harmless failure modes. Pinning my > > arm to a machine table or braining me with a 200 pound end of arm > > tool, not so much. :) > > > > Just food for thought. > > > > Best, > > Jason > > That's why emergency buttons always should be wired. Hard wired. > I'm not worried about wireless though, truck cranes and construction > cranes have been wireless for ages. > So are cement trucks. The last time I poured concrete in a big enough batch to need a truck, he drove up, stopped in the middle of the street, got out leaving it running, pulled a cigar box sized gizmo that looked like he could fly rc airplanes with it, out and strapped it around his neck so the top was about right under his hands, slightly higher than belt high. Getting comfy in it, he turned it on and proceeded to back & jack that truck with 9 yards of concrete into my driveway where he could chute it to where it needed to go, spun the drum up to rock and roll speed that left 6" deep ditches in my blacktop (it was scheduled for freshening anyway) for about 1 minute, and generally had us shoving the chute around, adding and removing sections as we moved while he pushed buttons to deliver the load. He never got back in the truck until it was empty and back out in the street, pointed straight down the street. And this was in 2008, I presume they are smarter yet today. He had enough confidence that he wasn't facing the truck, but watching the chute while he backed it straight at where he stood.
Cheers, Gene -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) My web page: <http://coyoteden.dyndns-free.com:85/gene> is up! TOO BAD YOU CAN'T BUY a voodoo globe so that you could make the earth spin real fast and freak everybody out. -- Jack Handley, The New Mexican, 1988. ------------------------------------------------------------------------------ Everyone hates slow websites. So do we. Make your web apps faster with AppDynamics Download AppDynamics Lite for free today: http://p.sf.net/sfu/appdyn_d2d_nov _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
