Gene, You mentioned that you are having/had issues with the idle current setup on your new drives. The problem (imho) is that the hardware ICR solutions require that steps be lost in order to wake the chip. So no matter what, at some point your likely to have missed steps. I played ad nauseum with the velocities and accelerations and kept getting frustrated by the creep (lost steps) on the Z axis of my gantry router. Since I mainly cut 2.5 D, the Z is idle 95% of the time with very short moves deeper into or out of the cut. I do not know how many times my router drove across my 2' X 4' surface at full depth on G0 back to the origin. Its amazing how powerfull 200 oz-in stepper motors are.
The Hobbycnc Pro board also has ICR. Take a look at the Wiki regarding this, Kim Mortensen has a nice writeup on the issues with ICR that probably go beyon just that board. ICR on the HCNC board uses an RC pair to trigger the reduction. I suspect that it typical of most setups. In my case, I simply eliminated the RC pairs and direct wired the axis chips to the parrallel port. Amp enable from EMC triggers the chip to wake before any step is issued. This eliminated all issues I had with ICR. Just a datapoint. ------------------------------------------------------------------------------ Doing More with Less: The Next Generation Virtual Desktop What are the key obstacles that have prevented many mid-market businesses from deploying virtual desktops? How do next-generation virtual desktops provide companies an easier-to-deploy, easier-to-manage and more affordable virtual desktop model.http://www.accelacomm.com/jaw/sfnl/114/51426474/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
