On Friday 09 May 2014 02:04:04 Erik Christiansen did opine And Gene did reply: > On 08.05.14 17:35, Gene Heskett wrote: > > FWIW, the Union Tool Co. level says the bed angle, high in front > > because the v-way is sticking up, is sitting at 175.5 degrees on > > both ends of the bed, so if it is warped, its not enough that I can > > actually measure. I thought it had a vernier scale, but I guess > > not. > > If resolution is 0.5آ°, then that'd pick up a 50 thou twist on a 5" > wide bed.
That puts it in perspective, but I didn't wait that long for the bubble to settle. And if there is a twist, by one measure its 2 to 3 thou an inch, by another nearly 10 thou. Taper correction for that I can put in the code, but have found it takes a correction tweak in mid turn if I want less than a thou in 2". It is not a huge problem now that I know about it, and how to fix it. > If 0.01آ°, then 10 thou is detectable. With a 0.02mm/m > machine level, one division is 0.00115آ°, and it's big enough to > visually divide by two or three. But even a full division is 1/10 thou > across 5", if I'm counting right. (You just have to wait a good half a > minute for the bubble to settle, for full accuracy.) > > My lathe also has the v-way sticking up at the front, so I bought a new > 1/2" square HSS lathe tool blank, to use as a nicely ground spacer on > the flat rear shear. (But then just plonked the level on the > flat-topped cross-slide, since that's what must travel level, anyhow.) About the only place I'd have would be on the back end of the compound, behind the tool post flat and that is visibly "pillowed", and could rock at least 50 thou on the pillow. With the computer running things, the compound has been snugged down pretty tight & hasn't moved in about a year. If I need an angle, its in the code I write. But thats a poor place to park a level. Current project is to get the counter shaft mounted rigid enough it can't move & give that belt a chance to jump teeth. I have an adjustable tension gizmo about half built. But to proceed, I need to rig a drill chuck with about a foot extension to I can drill & tap the bed casting near the bottom edge to give it an anchor point, perpendicular to the face of the casting. As discussed in a prev msg, it looks as if I'll have to dismount the z screw to get the movable end attached, which will be a good time to see about removing the rest of the end play slack in that screws anchoring bearing. $130 screw, has to be sloppy someplace I guess. Then of course sit down with a printout of my hal file & see where the speed delta limits got lost, that controller can turn that motor every which way including loose if there isn't a lowpass between requested speed and the pid.0.command pin. Its in there, but got lost when I bypassed the lincurve module after switching to PCW's SPIN1X interface from a C41. I need to put it back in, however the corrections to be spot on will not be nearly so gross. Under 15% worst case I think. But now that I am feeling better, I am getting a lot more done in a days time, so progress doesn't need a surveyor to set stakes & measure. ;-) Thanks Erik. 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) Genes Web page <http://geneslinuxbox.net:6309/gene> US V Castleman, SCOTUS, Mar 2014 is grounds for Impeaching SCOTUS ------------------------------------------------------------------------------ Is your legacy SCM system holding you back? Join Perforce May 7 to find out: • 3 signs your SCM is hindering your productivity • Requirements for releasing software faster • Expert tips and advice for migrating your SCM now http://p.sf.net/sfu/perforce _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
