Why don't you just touch off? Home to any old place.
Take a test cut at a programmed diameter of say 0.550". That means the programmed X value is 0.2750. After the cut, get the tool clear however you want, then move it back to X=0.2750 (I usually just do an MDI command). Mic the part you just turned, suppose it came out 0.556. That means that X was actually 0.2780", not 0.2760. Poke the X touch off button, type in 0.2780, and the machine is now set up to make accurate cuts. On Sat, Jun 15, 2013, at 05:54 PM, Gene Heskett wrote: > Greets all; > > I am still in the process of 'calibrating' this thing, having whipped the > motor speeds into shape with a lincurve between the pid.out and the > pwmge.value in pins. Works nicely now. > > And it only took another iteration to get the Z home position set about a > thou off the face of the new chucks jaws. > > But X axis home_position is being a cast iron bitch, possibly because any > HOME_OFFSET found in the .ini file would appear to be effecting the radius > as opposed to the diameter, so if I'm off 5 thou, and put another 5 thou in > the ini files value, I then have almost exactly the same error, but with a > - sign. > > But to measure this is about a 20-30 minute job because to use my gauge, I > must dismount the piece of .500" drill rod I am chucking up and adjusting > to within 2 or 3 10,000ths true in order to find where I am at each time I > edit the ini to add or subtract 2 or 3 thou. > > Looking at the hal-config, there is no place in its snooping ability to > look at the effective offset in place, or to setp a different value there > so the correct value can be found, and moved to the ini file with an editor > in real time. > > So my feature request is to have this added to the hal configuration > utility. > > In the meantime, I have another block of alu supergluing to the back of my > gauge, that I will drill & tap for an adjustment screw that will allow me > to adjust the tilt, and therefore the X offset of the gauge until the whole > thing is at zero offset. This will have the added advantage of converting > the gauge to a 3 point contact by having the rear contact the bed only at > the screws rounded head. As it is, its so sensitive from the large flat > area of that contact that I can see a film of Vactra squirted on the bed & > wiped off. Or a bit of invisible fiber from the Scott towel I used to wipe > it clean. > > I'll also know, from the error sign, which way to adjust the screw, > something I can't seem to figure out when its within .010" of correct when > using the stop LCNC, un-chuck the drill rod to get it out of the way of the > gauge, adjust the ini file, restart LCNC, re-home it, then mount the drill > rod and center it again, then run x in until it is gently holding a .0015 > feeler blade, and hoping the display will tell me I am at .503" diameter > when that occurs. > > Being able to tweak this with a setp in real time would be worth it in > bottled deer or sliced bread at setup/calibrate time. > > Humm, could I use the touch off to set that contact point at .503" in the > display, then find the difference that I need to move to the ini file in > one of the vars at #5000+ ??? That would likely help considerably. > > 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> > Dear Lord: > I just want *___one* one-armed manager so I never have to hear > "On > the other hand", again. > A pen in the hand of this president is far more > dangerous than 200 million guns in the hands of > law-abiding citizens. > > ------------------------------------------------------------------------------ > This SF.net email is sponsored by Windows: > > Build for Windows Store. > > http://p.sf.net/sfu/windows-dev2dev > _______________________________________________ > Emc-developers mailing list > Emc-developers@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-developers -- John Kasunich jmkasun...@fastmail.fm ------------------------------------------------------------------------------ This SF.net email is sponsored by Windows: Build for Windows Store. http://p.sf.net/sfu/windows-dev2dev _______________________________________________ Emc-developers mailing list Emc-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-developers
