On Wednesday 20 March 2013 09:27:25 andy pugh did opine: > On 20 March 2013 04:16, Igor Chudov <[email protected]> wrote: > > 1. I would like to be able to say to the machine, in G code, that > > "wherever we are on the A axis, call it zero degrees position". > > G10 L2 P1 A0 > > > 2. Is that correct that feedrate F in a G1 statement that changes both > > X, as well as A, only refers to the change of X? I can live with > > that, I just want to know. > > Yes. You would cut the thread with > G1 F10 X-2 A7200 > to make a 10 tpi 2" long thread. > However, F will not be the normal feedrate for a linear move, it needs > to be modified by a factor of pi * D * TPI to give the right feedrate.
Humm, Early here Andy. Since it is the R that determines surface speed the A rotation gives, my natural first thought would have been PI * R * TPI. I don't doubt you are correct though. Do I need to go make a pot of coffee to get me started tight? Cheers, Gene -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) My web page: <http://coyoteden.dyndns-free.com:85/gene> is up! My views <http://www.armchairpatriot.com/What%20Has%20America%20Become.shtml> No rock so hard but that a little wave May beat admission in a thousand years. -- Tennyson I was taught to respect my elders, but its getting harder and harder to find any... ------------------------------------------------------------------------------ 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_mar _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
