On Wednesday 06 April 2016 04:27:17 andy pugh wrote: > On 6 April 2016 at 02:53, Gene Heskett <ghesk...@wdtv.com> wrote: > > one plunge takes more time than the halscope can watch in 1 sweep. > > You can set a sample time multiplier in Halscope to sample for longer. > http://linuxcnc.org/docs/2.7/html/hal/tutorial.html#sec:tutorial-halsc >ope
I found that after I had posted, but locating a suitable triggering signal was my next hurdle. I finally did get a stable display but haven't anaylized it fully yet. I wanted to see the Z reversal in enough detail to see the backlash move. What I am seeing is almost too blended in to make a sure correlation between that, and a potential count loss when the Z cannot, with its backlash comp, keep up. I am hearing some oddities in the sound at that point, which do go away if I further restrict the speed of the spindles turn around. Or if I reduce the working rpms, either condition giving Z more time to stop, do the backlash takeup, and accelerate back to the pace the spindle rpm needs for a G33.1's turnaround at the bottom of the stroke. The way I apply the accel limit to the spindle results in a straight line ramp out of a limit3, from the fwd revs to the same revs in reverse. What I would like to do is synth a flat spot at about 5 revs in the ramp just as it reverses so that Z has time to do the backlash comp move before the spindle accelerates back to the nearly same speed in reverse. Obviously I also need to find and fix the backlash too, which may be in the nut just below the motor coupling, which is some sort of a high friction locknut, but is NOT double nutted. When I assembled it originally I had to lock the screw between 2 pads of wood to hold it tight enough to turn the nut, and was not at all happy that I had it correct. Now it is assembled, so I'll have to grab the lovejoy and hope that between the superglue and its bolt being about 1/16 of a turn from stripped, that it doesn't slip in the lovejoy. The stub sticking up was machined down to 10mm's when on a 16mm screw, it could easily have been at least 12mm's, giving the lovejoy that much more radius to use for traction. IMO, the screw should have been a 25mm screw, that head is heavy, with as of yet, no means of counterbalancing the weight. Some weak gas springs are on my buy em if I see them grocery list. So is a replacement 25mm screw, thrust bearing, nut and nut holder if I ever see it as a kit intended for the G0704/BF20 on fleabay. Thanks Andy. 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
