(Sorry to start yet another thread on much the same subject, but this is a bit broader-ranging)
It seems that spindle-synchronised motion is very sensitive to encoder regularity. Using the p-port to read the encoder position means that as the encoder linecount goes up, quantisation error in the measured positions also goes up, and so the inter-line period noise increases. Does this mean then, that very low linecounts will give less dither, and better results? http://www.pastebin.ca/1583502 Is the raw halscope data from my machine. If you plot the encoder position it looks dead straight, but the raw data shows that the difference between successive samples is quite variable. Is this possibly the reason that my attempts at threading are so hopeless? I would be the first to admit that my encoder is rubbish, it is a bit of computer-printed paper wrapped round the lathe spindle, but even if I was to get a high-accuracy encoder disc I feel I would still be at the mercy of sample quantisation errors. Any opinions on the best way forwards? I have got to the position where I want to start the project that I started building the lathe for, about a year ago. I don't really want to pull it all apart to change to an FPGA board if that is avoidable. -- atp ------------------------------------------------------------------------------ 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
