Gentlemen, I will check the tach on the motor tomorrow. I will reseat all the boards on the amp. I will check the thrust bearings. I will check the reversal action on the Y and Z axes tomorrow. The machine is tuned for longer moves and the only loose screw in attendance is the operator. I am convinced the control is not the culprit. I have tried to detune the X axis to minimize the reversal 'hit' and visual/audio/tactile perception shows no improvement. Would maxing the amplifier gain effectively remove the amp tuning from the equation and allow the EMC2 tuning to have more effect? Comments, ideas, warnings please. again thanks for the feedback and help Stuart
On Wed, Oct 8, 2008 at 5:12 PM, Chris Radek <[EMAIL PROTECTED]> wrote: > On Wed, Oct 08, 2008 at 12:20:02PM -0500, Stuart Stevenson wrote: >> John, >> There are two pictures on www.mpm1.com:8080/cinci >> one is the positive capture - the one that jumps - >> positive-jumps.png >> >> one is both the positive and negative capture - >> pos-neg.png >> the positive on the left and the negative on the right >> I moved the axis .0001 positive and then .0001 negative > > It looks to me like the compensation is applied over .1 seconds > with a velocity peaking at .05 inches/sec and acceleration of > 0.5 inches/sec^2 (but someone should check my reading of the scope > picture). > > In the ini it says the maxvel is 2.5 and maxaccel is 2.0, so I don't > see anything obviously wrong at first glance. > > A jog or G0 move of .005 length seems like it would give you this same > profile but at a higher acceleration. > > I wonder if maybe you just tuned the pid on longer moves and so these > short moves when the screw is loose (not moving any table mass) might > be badly handled by your tuning. By definition a backlash takeup move > and ONLY the backlash takeup moves happen with the screw loose. (If > anyone knows about screws loose, it's me, but that's another story.) > > > ------------------------------------------------------------------------- > This SF.Net email is sponsored by the Moblin Your Move Developer's challenge > Build the coolest Linux based applications with Moblin SDK & win great prizes > Grand prize is a trip for two to an Open Source event anywhere in the world > http://moblin-contest.org/redirect.php?banner_id=100&url=/ > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > > ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
