On 22 November 2015 at 16:22, andy pugh <[email protected]> wrote: > On 21 November 2015 at 18:07, Andrew Back <[email protected]> wrote: >> So, this must have been done >> by finding the workpiece and then turning the motor on for N >> milliseconds to retract the torch to piece height. > > Not necessarily, it might run a feedback loop on arc voltage.
Yes, this is how THCs maintain appropriate height from the workpiece after piercing. However, before they pierce they move to an initial height setting that is higher, so as to prolong the life of consumables, yet sufficiently close to allow transfer of the arc to the workpiece. > One HAL component that might be useful is: > http://linuxcnc.org/docs/2.7/html/man/man9/thc.9.html > > Or possibly: > http://linuxcnc.org/docs/2.7/html/man/man9/thcud.9.html Thanks, I'll take a look. Regards, Andrew -- Andrew Back http://carrierdetect.com ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
