Hi Steve, I'm not seeing that. At low speed, say 100rpm, the displayed spindle speed is rock steady, within 0.1rpm. Mind you I am using a low pass filter on the spindle speed display. Perhaps I should try it without the LPF.
At lower speeds the distortion of the thread is less as well. I don't know how stable the speed of my lathe is at higher speeds. I assume it is pretty stable as it is a pretty large machine but I haven't actually measured it. > In practice and my threads are as good as > I've ever seen my lathe produce. Same here. Mind you that isn't saying much. I never got a usable thread out of Mach. Les > Hi Les - there's jitter here too using an encoder. Funny thing is I've a > rpm meter on my screen and the jitter happens with the spindle stopped! > > It jumps to 100 rpm or so pretty randomly but frequently. > > It's being introduced from elsewhere inside emc or the pc it's NOT > coming from the encoder, I've had the scope and a frequency counter on > it and there's nothing there at rest. > > > I'm not seeing any variation In practice and my threads are as good as > I've ever seen my lathe produce. > > Steve Blackmore > ------------------------------------------------------------------------------ Crystal Reports - New Free Runtime and 30 Day Trial Check out the new simplified licensing option that enables unlimited royalty-free distribution of the report engine for externally facing server and web deployment. http://p.sf.net/sfu/businessobjects _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
