Hi John, The symptoms you are describing indicate that your Z axis stepper settings are too aggressive. It could be either the max speed setting or the acceleration setting. As a first pass, try adjusting the FEED OVERRIDE slider on the axis screen to about 50% and run the test again. That will limit the velocity to about 50% of your setup value. If it works then, you can try increasing the FEED OVERRIDE until it starts to screw up. If it doesnt work even at 50%, then it probably indicates that your acceleration params for Z are too big... try setting them to 50% of the current value using either the stepper config program or editing your .ini file directly. Once you find the limits for top speed and accel, you will want to set the values in the .ini file to about 75%-80% of the the limits you found by trial and error. This process needs to be done for the x and y axis as well. If you try and run the machine without finding and setting these limits during the commissioning stage, you will be very unhappy :}.
cheers On Sat, 2008-11-01 at 11:31 -0400, John Domville wrote: > Lawrence G > Ok, I finally got around to running the test you suggested. The first > couple moves (test #1) up and down > Are ok, but after that the tip gets lower and lower into the piece. Also > the motor makes a binding noise just > Before it starts screwing up. Sounds like the motor is trying to move two > opposite directions at the same time. > Never did get to test two. So where do we go now? This by the way is with > a config file that uses + as a Z axis up > And - as a Z axis down. Had a pencil stub loosely in the collet during the > test and it kept getting pushed further and further > Into the collet until I forced a stop to the program before the face of the > collet went in to the bed surface. > > John > > > > *********************** Original Text ***************************** > Try the following program.... it will test the Z axis configuration for > proper setup. Zero your machine with Z = 0.000 at the table top. Run the > program. It will make 200 moves back and forth from 0.5 to 1". If you > have a configuration issue, you will find that the final position will > not end up 0.500" that the axis window is showing. > > > ( test program to see if Z axis loses position ) > ( msg, test 1 of Z axis configuration ) > G20 > #1000=100 ( loop 100 times ) > ( this first loop has delays after moves - tests acc and velocity > settings ) > o100 while [#1000] > G0 Z1.000 > G4 P0.250 > G0 Z0.500 > G4 P0.250 > #1000 = [#1000 - 1] > o100 endwhile > > ( msg, test 2 of Z axis configuration ) > #1000=100 ( loop 100 times ) > ( this 2nd loop has no delays after moves - tests direction hold times > on driver config ) > ( and also max accel setting ) > o101 while [#1000] > G0 Z1.000 > G0 Z0.500 > #1000 = [#1000 - 1] > o101 endwhile > ( msg, Done...z should be exactly .5" above table ) > > m2 > > You can also change the G0 Zx.xxx instructions to G0Xx.xxx > or G0 Yx.xxx to test the x and Y axis for proper configuration. > > > > > > ------------------------------------------------------------------------- > 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
