I use G64 Pnn on my plasma with thousands of tiny lines and arcs and I can't tell that it is slowing down much if any and that is at plasma cutting speeds of up to 300IPM. Without G64Pnn the whole plasma table shakes as the speed ramps up and down... even contouring you should be roughing out most of the material for speed then do the final moves.
John On 1/7/2012 1:39 PM, Jon Elson wrote: > Anders Wallin wrote: >> my recollection from a few years back is that the rigorous exact-stop mode is >> G61.1 >> this stops at the end of *every* move. >> >> G61 improves slightly on this by "blending" moves where the >> end-tangent of the previous move matches the start-tangent of the next >> move. >> So with G61 there would be no stop with: >> G1X1 >> G1X2 >> (since we are continuing along the x-axis) >> > Right. Then, G64.1 Pxxx allows deviation from the commanded path to > keep the speed up. > But, it apparently only looks ahead one line, and restricts velocity so > it could stop at the > end of that line. This is the safe thing to do, but it may not give > enough speed in contouring > work. There, they may fly along a path, perhaps parallel to the X axis, > with small up/down > moves in Z. At the end of the traverse, the speed could be slowed down > to turn around and > go back in the other direction. Speeds may be so high that the machine > could not stop in > 10 or 20 moves. There are two options, I suppose. Provide a different > mode, where this > restriction is ignored, and the CAM is trusted to not ever exceed the > machine acceleration > limits. Or, develop an N-block look-ahead, and I know that can be QUITE > complex. > > This question comes up about once a year, I have essentially no > experience in this > contouring area. But, I can see that it is a bit of a shortcoming to > those that do. > > Jon > > ------------------------------------------------------------------------------ > Ridiculously easy VDI. With Citrix VDI-in-a-Box, you don't need a complex > infrastructure or vast IT resources to deliver seamless, secure access to > virtual desktops. With this all-in-one solution, easily deploy virtual > desktops for less than the cost of PCs and save 60% on VDI infrastructure > costs. Try it free! http://p.sf.net/sfu/Citrix-VDIinabox > _______________________________________________ > Emc-developers mailing list > Emc-developers@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-developers ------------------------------------------------------------------------------ Ridiculously easy VDI. With Citrix VDI-in-a-Box, you don't need a complex infrastructure or vast IT resources to deliver seamless, secure access to virtual desktops. With this all-in-one solution, easily deploy virtual desktops for less than the cost of PCs and save 60% on VDI infrastructure costs. Try it free! http://p.sf.net/sfu/Citrix-VDIinabox _______________________________________________ Emc-developers mailing list Emc-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-developers
