On 03/26/2013 01:21 AM, Gregg Eshelman wrote: >> I am not sure you will see good acceleration. In fact, it is >> >always >> >going to be less than 1g. This is because for any faster >> >acceleration >> >the strings go slack as the weighs don't fall fast enough. > No need to go anywhere near that fast because an oxy-acetylene torch or > plasma cutter can't cut that fast. This rig is most often used for cutting > steel 3/4" thick or thicker. Since counter weights are often used on Z axes on servo machines, I once decided to calculate how much of a limit the acceleration due to gravity would be. The metric calculations are left for you folks across the pond.
Acceleration due to gravity = 16 feet/second/second After 1 second the velocity can be 16 feet per second times 60 = 960 feet per minute (I love spreadsheets!) times 12 = 11520 inches per minute divide that by two, so half of that force can be applied to your cable = 5760 inches per minute HERE'S WHERE I AM MAKING ASSUMPTIONS THAT MAY BE OFF BY A LITTLE. If I recall properly 1500 inches per minute is a FAST servo system. 1500/5760 = .26 ( assuming linear acceleration it should only take .26 seconds to reach 1500 IPM) 1500/60 = 25 inches per second at 25 inches per second that servo system would travel 6.5 inches at full speed while the gravity system would be accelerating to 1500 IPM. Of course the servo system wouldn't be able to accelerate instantaneously, so the counter weight would only slow a 1500 IPM servo system down a little bit. I thought gravity would be much more of a limit too. ------------------------------------------------------------------------------ Own the Future-Intel(R) Level Up Game Demo Contest 2013 Rise to greatness in Intel's independent game demo contest. Compete for recognition, cash, and the chance to get your game on Steam. $5K grand prize plus 10 genre and skill prizes. Submit your demo by 6/6/13. http://altfarm.mediaplex.com/ad/ck/12124-176961-30367-2 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
