On 12/17/2013 07:09 PM, Jeshua Lacock wrote: > Greetings, > > I dusted off my CNC machine which required a bit of TLC. > > The system is now perfectly stable and all axis work using both Manual > Control and MDI. Shortly after I try to run gcode it stops with most often a > following error or sometimes something is silently throwing the estop. > > I am using Pico's universal stepper controller with their gecko interface. > > Please see a plot of the axis that is causing the following error on my test > gcode: > > http://3dtopo.com/z-servo-plot.png > > I am really stumped, any advice would be greatly appreciated! > > >
Ah, you say the Gecko interface. So, you probably are using brush servo motors and the Gecko 320 step-servo drive. It may just be running out of dynamic range. What is your power supply voltage? I see in the delta plot that the velocity is ramping up to 5 units, meaning 5 encoder counts/servo period, or typically 5000 counts/second. Taking a wild assumption of 500 cycle/rev encoders, that would be 2.5 revs/second or 150 RPM, which doesn't sound very fast. But, if they are 500 count/rev encoders, that would be 600 RPM. Depending on the motor and the supply voltage, that could be as fast as it can go. Also, there are parameters in the .ini file such as MAX_VELOCITY PID_MAX_VEL OUTPUT_SCALE OUTPUT_SCALE is a **divider**, so larger numbers reduce the output command to the step generator. Generally, it is left at 1.0 (or -1.0 to reverse direction). MAX_VELOCITY and PID_MAX_VEL are in user units per SECOND. PID_MAX_VEL should be slightly higher than MAX_VELOCITY to give the PID calculation a little headroom for acceleration. Make sure these ini file settings are sufficient for your machine. It looks from your plot that the move is about .4" per second, or 24 IPM. Figure out how many RPM you need to move at that speed, then work backwards from supply voltage and motor ratings to see if the voltage can give that speed. Feel free to contact me if the above hints don't point you to the solution. Jon Jon ------------------------------------------------------------------------------ Rapidly troubleshoot problems before they affect your business. Most IT organizations don't have a clear picture of how application performance affects their revenue. With AppDynamics, you get 100% visibility into your Java,.NET, & PHP application. Start your 15-day FREE TRIAL of AppDynamics Pro! http://pubads.g.doubleclick.net/gampad/clk?id=84349831&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
