z axis error
04 Jun 2010 18:24 - 04 Jun 2010 18:25 #3067
by david_r
z axis error was created by david_r
Hi,
I'm new on the forum, but I use emc2 for a few years.
I've encountered a strange problem when machining something that has a lot of tiny Z axis moves - like lithopanes or fine 3d engravings.
I've made a few tests and here are the results:
When running this code:
Result is OK, my dial indicator shows 0.000mm
But when running this code:
Result is not OK, my dial indicator shows -0.620mm
Lowering Max Velocity and Max Acceleration does not help.
What is the cause of this problem and how to fix it?
Machine setup: EMC 2.3.5, stepper motors, gecko G212, HIWIN ballscrews, HIWIN linear rails,...
Attached picture shows errors on the right side, where is a lot of tiny Z axis moves, and perfectly flat plane on the left side.
Thanks,
David
I'm new on the forum, but I use emc2 for a few years.
I've encountered a strange problem when machining something that has a lot of tiny Z axis moves - like lithopanes or fine 3d engravings.
I've made a few tests and here are the results:
When running this code:
#1000=100 ( loop 100 times )
( the next loop has no delays after moves )
( tests direction hold times on driver config and also max accel setting )
o101 while [#1000]
G0 Z0.009
G0 Z-0.009
#1000 = [#1000 - 1]
o101 endwhile
G0 Z0
( msg, Done...Z should be exactly 0.000mm above table )
M2Result is OK, my dial indicator shows 0.000mm
But when running this code:
#1000=100 ( loop 100 times )
( the next loop has no delays after moves )
( tests direction hold times on driver config and also max accel setting )
o101 while [#1000]
G0 Z0.001
G0 Z-0.009
#1000 = [#1000 - 1]
o101 endwhile
G0 Z0
( msg, Done...Z should be exactly 0.000mm above table )
M2Result is not OK, my dial indicator shows -0.620mm
Lowering Max Velocity and Max Acceleration does not help.
What is the cause of this problem and how to fix it?
Machine setup: EMC 2.3.5, stepper motors, gecko G212, HIWIN ballscrews, HIWIN linear rails,...
Attached picture shows errors on the right side, where is a lot of tiny Z axis moves, and perfectly flat plane on the left side.
Thanks,
David
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05 Jun 2010 10:14 - 05 Jun 2010 10:16 #3070
by david_r
Replied by david_r on topic Re:z axis error
Hi,
I believe the problem is solved - thanks KimK.
After changing gecko from half step to 10 micro-stepping, here are the results.
I must make something bigger to be sure, but I believe that micro-stepping solved the problem.
David
I believe the problem is solved - thanks KimK.
After changing gecko from half step to 10 micro-stepping, here are the results.
I must make something bigger to be sure, but I believe that micro-stepping solved the problem.
David
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05 Jun 2010 10:18 #3071
by david_r
Replied by david_r on topic Re:z axis error
Different angle:
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