On Tue, Mar 1, 2011 at 3:56 AM, andy pugh <bodge...@gmail.com> wrote:
> On 1 March 2011 06:11, Igor Chudov <ichu...@gmail.com> wrote: > > > So. How would I somehow configure EMC to stop providing any current to > "W", > > when not really moving it? > > I can think of two ways, either of which might work. > > More "I" term might might allow the current to build up to a high > enough level to actually hit the setpoint. > Alternatively, setting a deadband in the PID might do the trick > (though I suspect that, actually, it would just end up sat at the > bottom of the deadband getting just as warm) > > I will try tonight. Think about it this way: the way I worked with a MANUAL crank is, when I needed to move the knee, I would crank it, watch the dial, and stop where appropriate. After this, I let go of the crank. I do not obsessively hold the crank, trying to prevent any movevent (like EMC does), and specifically I do not keep pushing the crank to move that last thousandth, while not quite pushing enough to really make the move. I just get it to where I am satisfied, and let go of the handle. What EMC does instead is, it keeps applying the PID algorithm to the motor, and tries to push it "the last thousandth", without actually geting there, so the motor just heats up from current passing through it. The knee ACME screw is self locking. How can I make EMC do the same, just "let go" after it gets to the right place? Again, I will be using W axis for adjusting movements, usually without even other axes moving, just to adjust for tool height, so that I could use long tools and short tools within the same program. i ------------------------------------------------------------------------------ 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
