On Feb 3 2013 10:21 PM, TJoseph Powderly wrote: > EBo, your name rings a bell all the way back to Paul Corner EMC days, > you been arounf here a long time i think
Yes. Paul's nastiness is why I completely disengaged from EMC for a *very* long time. It was the type of two faced - stab you in the back - interaction that the culture I come from tolerates a lot less than a literal punch in the face. Interestingly enough I was being funded to work on EMC at the time, and could have focused on it 40+ hrs/wk, and the kerflufle caused me to just walk away... If that history bothers you, I can easily bow out permanently. > ... > > this constant velocity is totally unsuited to EDM, the finaly > mechanical > driving element better to jiggly and nervous, else it aint repecting > the > process > uncover the final gear or screw on any real working edm and watch, it > approaches a smooth forward motion but IS jiggly and nervous. > > ... The EDM head I wanted to prototype, based on a some old work I saw once, has the jiggly portions controlled via analog circuitry in an internally closed-loop. All I would need it to do is either output a pause, or an analog feedback that basically adjusts the speed overide from where the user sets it down to 0 (full stop). That way it should be able to fully integrate into LinuxCNC. BTW, I should add, that the EDM head I am talking about is a sink type, and is self retracting a very small distance, but all of that is handled by the head. That is how the current V/C feedback is maintained. > mydynac repairs cnc edm for a group in sugar grove illinois 'edm > network' owned by Ron Vogel ( iirc) > > the work done more recently by Scott Haase in WI >can< reverse and is > limited to an upper and lower bound > (same as mine) > his uses O-word gcode, mine is hal based ( limits sets by mcodes, and > motion implemented thru 'offset' hal component ) > his o-word may be easier to debug, dunno, but for immediacy, hal > should > prove mpre responsive because its 1 less layer of control If I can find an old wire fed, or other industrial EDM, then I can see spending a lot of extra time on a project like this. > and for the edm gap voltage -> arduino -> threshold comparison -> hal > -> > motion loop of Mr Haase > well there many layers removed by directly connecting a window > comparator to a hal 'offset' comp If I do the arduino thing, it will be completely independent of LinuxCNC and not an addition to it. I have some experimental code I wrote over a decade ago, when I was taking PhD level courses in Computer Aided Geometric Design, which converts standard G-code into an abstracted motion splines. The intent was to eventually implement the low level as a NURB, but started with Bezier splines because I had several implementations of them at the time. Part of that design was to incorporate a fully runtime polymorphic parser (which allows you to overload things like how comments were handled and different interpretations of the g-coded standards -- which allows you to run very old g-code for a machine without modification on a more modern machine/retrofit). All of the last part could also load user definable modules at startup, so you would not have to recompile/reconfigure the program to use different constructs. Anyway, I let that effort fall by the wayside... > <out of sequence> > > the idea of orbitining is to use the distance moved away from the > 'roughing point' to feed a sine and cosine generator > and use that value to move X&Y along the surface of a circular cone. > As > the Z motion increases, the circle increases ( and drops ) > if the process sees a redcuced input signal , ALL axis collapse to > the > that 'roughing point'. I will have to think on this. I can see that it could be used to produce a similar effect to adaptive clearing (and share the tool ware over a much greater area). For the moment I have no interest in this, but I can see the benefit of the functionality. EBo -- ------------------------------------------------------------------------------ Everyone hates slow websites. So do we. Make your web apps faster with AppDynamics Download AppDynamics Lite for free today: http://p.sf.net/sfu/appdyn_d2d_jan _______________________________________________ Emc-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-developers
