On Thu, Oct 13, 2016 at 9:00 AM, Peter C. Wallace <p...@mesanet.com> wrote: > On Thu, 13 Oct 2016, dan...@austin.rr.com wrote: >
> I just tried a real time Mesa Ethernet config with maxvel = 120000 IPM (2000 > IPS = 20 MHz step rate at present 10000 steps/In scaling) and maxaccel 20000 > IPS/S (52 Gs) with a 1 KHz servo thread, and it works fine (Peak following > errors in the 1-2 mill region) The problem to be solved is getting an estimate of the time required to complete a job. Does the above do this accurately? The problem is to get the shape of the velocity curves to be the same in the sim as the real job. In a real 3D wood carving job I thing the mill never gets to near full speed and is always making think movements and accelerating. Your sim MIGHT accelerate to quickly and make some parts of the work run at a constant velocity (your maximum) Intuitively (I've not proved it to myself) you need to scale the max speed and acceleration by the same constant. (But what about third derivative?) Time estimation seem to be a missing feature. It should not require a hack I _think_ that a machine tool that has all orthogonal and linear axis where movement time depends only on delta-X and not on X (or Y or Z) then you should not require a full simulation to compute the job time as you can simply sumo the deltas. Note that there ARE many non-linear machines but mostly these are robots. -- Chris Albertson Redondo Beach, California ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, SlashDot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users