Greetings all; I haven't been able to spend time on tuning the mill for best performance while pecking a G33.1 recently as my back is limiting what I can do, and what I have been doing is some troubleshooting of the local daytimers transmitter. It turned out the schematic being used to service it for the last 50 years has an error in how the modulators driver stage is wired, and someone back in prehistory tried to make the wiring look like the erroneous schematic. But I am good with that sort of thing and I believe I have it wired a lot closer to proper than it has been in the last 25 years. rive is now much better balanced, and so is the color of the tubes at full song. Anyway, while playing with the mill, specifically with the limit3's maxv, which shapes the direction reversal ramp delivered to the PID, I found that raising the value gave me axis 2 following errors. Re-reading the manpage, I now understand that larger values actually steepen the ramp, and I finally overpowered the Z axis's ability to accelerate and keep up. Duh.
So this question follows: I am not not setting a maxa since I am not a derivitive's math genius: Would it be advantageous to do so?, and if so, is there a "rule of thumb" for a suggested starting value? That manpage is a bit sparse. It seems to me the axis acceleration worst case is at the ends of the applied ramp, and that rounding the corners there might be a good idea. Ideally, the ramp should look more like one side of a "sine squared" signal that we used in the NTSC broadcasting days. That would imply a value nominally 2x the maxv? Am I on the right track? Thanks a bunch. Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ Find and fix application performance issues faster with Applications Manager Applications Manager provides deep performance insights into multiple tiers of your business applications. It resolves application problems quickly and reduces your MTTR. Get your free trial! https://ad.doubleclick.net/ddm/clk/302982198;130105516;z _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
