Hi Jim, If you remember the booth at Cabin Fever, there was a slide show playing at the corner of my booth showing a Hurco conversion done by a friend of mine. While he has not yet tweaked his system, we should be able to send him some sample files and see what sort of results he gets. His system is using the Mesa hardware along with the original Hurco amps and motors. His Hurco had the high resolution option, so he has not upgraded his encoders.
Remember our discussions about how EMC handles path deviation? You can control the allowable error in three ways, first by programming the G code to set a tolerance band that allows the motion planner to simplify the path by merging blocks that are not necessary to stay within the tolerance, second by allowing blending of moves in constant velocity mode to avoid decreasing feedrate in corners, and third by setting a following error that monitors how far from the commanded path the machine is in real time. These features give you the ability to make selected tradeoffs in performance and accuracy based on your requirements. Regards, Steve Stallings > -----Original Message----- > From: Jim Fleig - CNC Services [mailto:[email protected]] > Sent: Monday, February 02, 2009 4:41 PM > To: Enhanced Machine Controller (EMC) > Subject: Re: [Emc-users] PID questions > > Hi Peter, Hi Stephen, > > Thank you very much for your answers. > > The goal is to retrofit a knee mill (Hurco KM3P) in very good > mechanical condition with the original servo amplifiers > (analog signal, + / - 10 vdc) and then cut 3D gcode output > from a MicroSoft (please keep the booing in the > backround) based CAM software. The user must be able to > connect to the MicroSoft network (Centroid is currently Linux > based and I connected the customer's machine to the MicroSoft > network by following Centroid's > instructions) to download files (most preferable) or load the > gcode onto a thumb drive and walk the program to the EMC > control, load, setup part zero and tools and run. > > This application is very blocks per second intensive. > Spending money on a faster CPU or dual CPU's would be weighed > against the benefits of the ability to mill faster. The > Hurco, prior to the control dying, would average 25 ipm. If > after retrofitting it would average 50 - 60 ipm this would be > a substantial increase. I really don't think it will do much > better than that because it is a dove tail saddle. > Consistently higher feedrates would require linear ways. The > Centroid retrofitted mill that averages 60 ipm has a dovetail saddle. > > Any recommendations for a fast motherboard? Fast motion > control board? > Approach to configuring the system? > > If this goal can be achieved on a par with a Centroid system > (the best I have seen so far for 3D milling on knee mills but > I haven't seen everything) then I have a customer ready to > give it a try. > > I look forward to your reply. > > Have a good day, > > Jim > > > ----- Original Message ----- > From: "Stephen Wille Padnos" <[email protected]> > To: "Enhanced Machine Controller (EMC)" > <[email protected]> > Sent: Monday, February 02, 2009 3:59 PM > Subject: Re: [Emc-users] PID questions > > > > Peter C. Wallace wrote: > > > >>>EMC2 can do this, but I don't know if anyone has yet. The > PID component > >>>now outputs error on a pin, and also outputs a "saturated" > signal when > >>>output has been too high for a period of time. These can > be used, along > >>>with adaptive feed override, to reduce the overall feed rate. > >>> > >>>- Steve > >>> > >>> > >>Making such a system stable is not something I would like to try > >>however... > >> > >> > > Indeed. I imagine you'd need pretty low frequency filters > on the error, > > and only allow AFO changes after some saturated period. Of > course, that > > may make the technique ineffective, since responding to > impending error > > conditions probably needs to be pretty quick. It also > won't help for > > spindle-synchronized moves (unless you also modify the > spindle speed by > > the AFO factor). > > > > - Steve > > > > > > > -------------------------------------------------------------- > ---------------- > > Create and Deploy Rich Internet Apps outside the browser with > > Adobe(R)AIR(TM) > > software. With Adobe AIR, Ajax developers can use existing > skills and code > > to > > build responsive, highly engaging applications that combine > the power of > > local > > resources and data with the reach of the web. Download the > Adobe AIR SDK > > and > > Ajax docs to start building applications > > today-http://p.sf.net/sfu/adobe-com > > _______________________________________________ > > Emc-users mailing list > > [email protected] > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > -------------------------------------------------------------- > ---------------- > Create and Deploy Rich Internet Apps outside the browser with > Adobe(R)AIR(TM) > software. With Adobe AIR, Ajax developers can use existing > skills and code to > build responsive, highly engaging applications that combine > the power of local > resources and data with the reach of the web. Download the > Adobe AIR SDK and > Ajax docs to start building applications > today-http://p.sf.net/sfu/adobe-com > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ Create and Deploy Rich Internet Apps outside the browser with Adobe(R)AIR(TM) software. With Adobe AIR, Ajax developers can use existing skills and code to build responsive, highly engaging applications that combine the power of local resources and data with the reach of the web. Download the Adobe AIR SDK and Ajax docs to start building applications today-http://p.sf.net/sfu/adobe-com _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
