On Thursday 22 May 2014 13:45:55 Sebastian Kuzminsky did opine And Gene did reply: > On 5/22/14 11:23 , Gene Heskett wrote: > > In setting up the homing switches on my lathe, there are two items in > > the .ini file I don't quite have the results I see, making any sense > > when I adjust them. > > > > These are HOME_POSITION, and HOME_OFFSET. > > There's no .ini variable named HOME_POSITION. Did you mean just > [AXIS_*]HOME?
Yes, working from ancient wet ram. :) > [AXIS_*]HOME_OFFSET is the location of the home switch. Aha! I don't believe it says that that clearly in the docs. So ideally I should use the offset by setting it according to how far it can go past the switch LED going off before the toolpost contacts the chuck. And call that HOME_OFFSET for that axis. > [AXIS_*]HOME is where the axis should park immediately after homing. A good 100mm away from the chuck. Gotcha, Thanks Seb. > These are both described in the homing documentation: > > http://linuxcnc.org/docs/2.6/html/config/ini_homing.html > [...] > I'll assume your machine cannot travel to the left of your Z home > switch. Yes it can, but not far enough to come back off the switch since that gib is about 100mm long. I would be well and truly into the chuck body by about 50mm by then. > If that's true i would use the Z home switch as the minimum Z value, > Z=0 in G53. I'd set Z's HOME_OFFSET to 0 mm (so that the home switch > is at 0mm in G53) and i'd set Z's HOME to 50 mm (so that the machine > parks 50 mm to the right of the home switch after homing). > Make sense? Somewhat, but see above. What I want is a truly safe parking position. Then my plan to put 8mmx2.5 ball screws in my micromill just got trashed, the shop where I took the table Monday morning to get the screw & nut clearance groove in its bottom deepened enough to clear the ball nut holder, just called and has been swamped with oil field machinery work since & can't get to me for at least a month. I wish I had a plan B. Even another 30 thou of room and I could pull it off. So, back to the drawing board. I wonder how much I can remove from the sides of the nut before I am in danger of finding the ball races outers... That of course means I can't make the nut pocket on the lathe, but will need to use the mill and make a deep (0.925") double d flat pocket. S/B fun writing that code! Damn, everything I like is either illegal, immoral, or fattening. and with my back, fattening is a no-no. In 2002 I weighed 205 lbs, yesterday 158.8 lbs but I'm starving to get there. Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> US V Castleman, SCOTUS, Mar 2014 is grounds for Impeaching SCOTUS ------------------------------------------------------------------------------ "Accelerate Dev Cycles with Automated Cross-Browser Testing - For FREE Instantly run your Selenium tests across 300+ browser/OS combos. Get unparalleled scalability from the best Selenium testing platform available Simple to use. Nothing to install. Get started now for free." http://p.sf.net/sfu/SauceLabs _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
