On Tue, May 19, 2009 at 09:31:46PM +0100, Steve Blackmore wrote: > On Tue, 19 May 2009 18:00:40 +0100, you wrote: > > >Just a quick followup on my query about using a single index pulse for > >threading. I got it set up on my lathe with a magnet and a hall sensor. > >It reads the speed pretty accurately though there is a bit of jitter at > >higher speeds (500rpm upwards). > > 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.
halscope the encoder index signal and trigger on rising edges -- make sure you attach to the base thread, not servo thread. If you see edges, then you can look to your physical wiring to figure out where the spurious edges are coming from. Jeff ------------------------------------------------------------------------------ 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 [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
