On Wed, Mar 2, 2011 at 8:41 PM, Jon Elson <el...@pico-systems.com> wrote:
> andy pugh wrote: > > On 2 March 2011 13:10, Igor Chudov <ichu...@gmail.com> wrote: > > > > > >> Yes, but how do I de-energize the motor in EMC? > >> > > > > You could do it explicitly in the G-code. (via a digital output), > > though that seems inelegant. > > > Yes, I think it is so inelegant that I refused to suggest it! > > What might work would be a ddt hal function on motor position command, > > such that when the motor is commanded to move it does so, but when the > > position command ceases to change, the motor power is set to zero. You > > will probably find that the axis stops moving a millisecond early, > > though. > > > Hmmm, an automatic shutdown of the axis. Yes, you could do that with > simple HAL components. > Again, I say, it is really inelegant. But, it could work pretty well, > although you'd have to be aware > the final position would be arbitrarily far from the commanded position. > > I still think getting the PID control loop to work properly is the best > solution. > > I agree, but keep in mind that this axis is a ACME screw. It is self locking, the table does not move when it is not being cranked. ------------------------------------------------------------------------------ Free Software Download: Index, Search & Analyze Logs and other IT data in Real-Time with Splunk. Collect, index and harness all the fast moving IT data generated by your applications, servers and devices whether physical, virtual or in the cloud. Deliver compliance at lower cost and gain new business insights. http://p.sf.net/sfu/splunk-dev2dev _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
