On Monday 10 September 2018 06:49:38 andy pugh wrote: > On Sat, 8 Sep 2018 at 20:23, Gene Heskett <ghesk...@shentel.net> wrote: > > change sign of lincurve y-val, still worse. Seems like the > > correction is being multiplied by 3 or more. > > Can you tabulate the input and output of lincurve (measured by > halmeter at the pins). > If it is outputting numbers that are bigger than the input data then > there is something wrong.
I'm not pointing a finger in lincurves direction as what I looked at with a halmeter looks good. I may have tabulated diameter previously by mistake, so I went out yesterday and using a 0.0001" dial, logged the RAD to zero the dial every .2" of travel, so I may have better data now. Part of the problem now is that when I got 20" down the A2 rod, the *^#^%$ tailstock was off by -0.0065". So now I need to take that data and normalize it to a well centered tailstock, in proportion to its position relative to the left, start. And I can likely throw away those that seem to be essentially a straight line, like from -5.8", the zero ref, to -4.1 it needs -.0020, then it goes back to only -.0007 at -3.1" So that, -0.0007, with the tailstock error factored in which would be that -.0065 reduced to what it would be at that distance which is (2.9" away from the starting point/20)*-0.0065" = -0.0012675 at that point. so the first x-val-00 is -5.8, the corresponding y-val-00 is 0.00000, the second x-val-01 is -3.9 (1.9" from start) and its corresponding y-val-01 is then -0.0006175, not the -0.002 I logged. x-val-02 then is at -3.0" from start or 2.8" out from the anchor point and the corresponding y-val-02 I logged at -.0007, becomes -0.00161, yadda yadda. And I don't think thats right, I'd better do it again. But basicly take the peaks observed, use those for x-val-nn and then add the absolute distance/20 to get the amount of that -0.0065" offset to add to what I logged at that distance. Something along those lines should get me well within a thou, and by throwing away the ramps between the peaks, get it all within the 16 point range of a single lincurve module. Thats the plan anyway. :) And if I haven't confused everybody by now, I'm sorry. ;-) Somethings gone sour in my cheap air compressor, its peaking at about 47 lbs and runs till I turn it off, stinking up the garage with the fog of burnt oil, so I guess I'll have to run over to Harbor Freights new store and get another. They've got a new 8 gallon that can make 150 psi which is 60 higher than I've had this one set at for something over a decade. I'll set it at about 80 or 90 so it does a decent job of cleaning up and it still can fill up a low tire in a decent time. Old Toy wheels rust & won't hold air and the mandated nag light on the dash makes a nuisance of itself, so you go around it and put about 42 psi in every tire to put the light out for a week, maybe... PITA. But I'm not putting $700 in new cheapest steel wheels on an 12 yo Toy RAV4. -- 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> _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
