Re: [Emc-developers] PID musings

2012-01-13 Thread andy pugh
On 13 January 2012 06:05, Jon Elson wrote: > I will have to try negative D values to see what they might do. D might want to be negative or positive, depending on what you are trying to achieve. You can use it to help catch a fast-moving setpoint (positive D) or to reject transients (negative D)

[Emc-developers] howto var from GLcanon to GlcanonDraw

2012-01-13 Thread Sammel Lothar
Hi im not the OOP programmer . it works thru Global but HOW do i THE PYTHON way Transport a flot value given by a G-code Command (AXIS,) From GlCanon command() as self.Varname declared to GLCanonDraw as self.varname i need it only in redraw Thanks Lothar Germany -

Re: [Emc-developers] PID musings

2012-01-13 Thread Karl Cunningham
On 01/12/2012 10:05 PM, Jon Elson wrote: > I was just perusing some of the EMC docs, and wound up on the PID > hal component docs and source. I have never quite understood the > behavior of > the D term. > > To (over) simplify: > error = commanded - feedback > errorD = error - previous error > out

Re: [Emc-developers] PID musings

2012-01-13 Thread Jon Elson
Karl Cunningham wrote: > I assume from your results there is a typo in the feedback -- it should > have been 4.9 this cycle and 4.8 last cycle. So > Terribly sorry, YES, that is what I MEANT to type! > If I'm missing the boat, please let me know. > Maybe I'd better refrain from doing even SI

Re: [Emc-developers] V2.5 documentation - issues

2012-01-13 Thread Kent A. Reed
On 1/7/2012 7:28 AM, John Thornton wrote: > Hi Kent, > > Are you reading the HTML or the PDF? The HTML is easier to convey which > file your reading and that makes it much easier to find and fix any > errors. Thanks for proof reading them. > > Thanks > John > Hi, John. Once again I'm in the positi

[Emc-developers] V2.5 documentation - issues with HAL "manual"

2012-01-13 Thread Kent A. Reed
Gentle persons: This message covers editorial issues I found reviewing the HTML files on http://www.linuxcnc.org/docs/2.5/ concerning the (English) HAL manual. In this email I shall call them parts. I have titled my comments on each part according to the link title in index.html and given the l