Il giorno dom, 12/02/2012 alle 19.48 -0600, Jon Elson ha scritto: > Mark Haynes wrote: > > For recording movements at every 1/2 second intervals is the g-code file > > that you play back consist of a new line for each 1/2 second? So that every > > line of g-code is a x,y,z, and feedrate value for that 1/2 second interval. > > If so I think there would need to be some preprocessing of the G-code to > > remove redundancies. Such as if you move in a straight line from x0. to > > x10. at constant velocity the preprocessing would simplify the command to > > one line of code instead of showing what to do for each half second > > interval. In my own personal experience with building a CNC system I found > > the time it takes for the computer to interpret a line of g-code and break > > it down into machine motion very taxing on the PC. This may be why it > > doesn't work at high speeds on 1/10s intervals. (However, I'm not sure if > > this is true for LinuxCNC). > > > > I'd be interested in learning more on your work so far. > > > I did some tests a few years ago that showed a 600 MHz Pentium III could > handle > 750 or so blocks of G-code a second. No doubt it can go higher on more > modern CPUs. > > Jon I'm sure with my pc i can have an higher recording rate. The problem is that when i've tried to record every 1/10 of sec doing rapid 3D movements (let's say 1 m/s) the curve is recorded in little lines (one every 1/10s..) so when i reproduce the movement, the system cannot reach that speed, because the lines where so little!
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