On Tue, 2009-09-29 at 17:04 +0100, Andy Pugh wrote: ... snip > > > http://www.youtube.com/watch?v=NDA48nLdbiI > > More data after a long discussion on the IRC channel: > HAL setup: http://www.pastebin.ca/1581821 > Halscope grabs: > http://www.atp.pwp.blueyonder.co.uk/G76.png > http://www.atp.pwp.blueyonder.co.uk/g76b.png > > It seems to be related to the index pulse rate. But there is no trace > of the index pulse in the input to motion.spindle-revs > > -- > atp
I have only read the original post and watched the video, so I may be off base here. I had the same symptoms on my lathe. I believe the thread pitch and spindle RPM are at a rate that is beyond the Z axis abilities to accelerate. I slowed my spindle RPM down and allowed for a fair amount of air cutting to allow Z to stabilize before reaching the real threading. I also tried to optimize my acceleration settings. Too high of an acceleration number created following errors, so it's a compromise. Basically your Z cannot instantly accelerate to match the spindle RPM. It's like trying to grab onto a moving carousel. It just came to mind, I wonder if changing the spindle RPM would help -- slow at first, fast in the middle or the tread, then slow again at the end? -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/index.html California, USA ------------------------------------------------------------------------------ Come build with us! The BlackBerry® Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9-12, 2009. Register now! http://p.sf.net/sfu/devconf _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
