On Sunday, May 06, 2012 09:15:18 PM Jon Elson did opine: > gene heskett wrote: > > On Sunday, May 06, 2012 02:33:08 PM Jon Elson did opine: > > > > > > > > What is the best practice to establish the X zero on a lathe? I am > > making a test cut, measuring it and dividing that by half to enter in > > a Touch Off. > > If you have a quick-change toolpost,
I do. > you should be able to set up X and > Z offsets for each tool in the tool table. That would require I get at least 3 or 4 more QC toolholders. But then I am reminded that the QC post must be rotated in order to present the tool to the work at the correct angle, which is only as repeatable as eyeballs can make it. OTOH, I do need more toolholders. I could make a setting tool that would fix the reach out of each tool pretty consistent. But before I tie a few hundred more up in holders for this flimsy post, my first inclination is to ditch the whole compound slide since linuxcnc can handle that rather nicely, and put a bigger, far more rigid QC post directly on the X cross-slide. Something made out of real steel as opposed to the crappy, flexible alu this QC is made out of. The thought also crosses my mind to mount a microswitch for homing that could be dropped into a locator on the carriage, but that would require a touchbar 3 inches long that was exactly on axis. The alignment to keep it on axis while allowing it to swing out of the way, or be "unplugged" to get it out of the way would be fairly stringent though As for z axis, I generally pick an arbitrary stickout suitable for the job and locate on the end of it, writing the gcode to run negative from there. > Then, you leave the tool > offsets on > all the time. X=0 is the center of the part, Z=0 puts the tool on the > chuck (or wherever you decide to have the Z zero). > > > Has anyone else come up with a better idea that might be more usable? > > But, I don't have a CNC lathe setup, so the lathe users should have the > exact things > to do. Maybe someone who does can spare a few words here? > Jon Feature request: Whoever has the touch-off code box, it sure would be nice if when you called it up, it displayed the current value separate the input box. As is, I have to write it down, so I know where I am if I only need to adjust it say 0.0027 from where its at to get it exactly the right size for the next pass. That would be almost as handy as bottled beer. :) Thanks Jon. > ------------------------------------------------------------------------ > ------ Live Security Virtual Conference > Exclusive live event will cover all the ways today's security and > threat landscape has changed and how IT managers can respond. > Discussions will include endpoint security, mobile security and the > latest in malware threats. > http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users 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> Computers don't actually think. You just think they think. (We think.) ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
