The lower you have your acceleration set - the more you will see emc2 'blending'
http://wiki.linuxcnc.org/cgi-bin/emcinfo.pl?TrajectoryControl
If you want it to be exact path you need to use G61. This will stop at every
endpoint and follow the path exactly. You could do a G64 Px.xxx where x.xxx is
how close you want emc to follow the actual path. emc will slow down during
direction changes enough to stay within the tolerance you specify.
----- Original Message -----
From: Tamas Konya
To: [email protected]
Sent: Thursday, August 23, 2007 7:33 AM
Subject: [Emc-users] Curve in place of square edges...
Hi all,
I use the EMC 2.1.6 with a Bridgeport style, three axis BLDC servo system.
The servos are digital types with own position loops. Two parports, software
PID loops and freqgen used, see that picture
http://www.upload-images.net/imagen/390bf13788.jpg for more.
I use this G code to test:
G92.1
G61.1
G10 L2 P2 X0 Y0 Z-0
F500
G55 G1 X0 Y0 Z0
G01 X50 Y0
G01 X50 Y50
G00 X0 Y0
M30
It's qiute accurate, just a little bit slow. But the edges what it makes
likes to a curves not a sharpe edge. After a lot of time to tune up, I have no
idea about it... I try the G61, G61.1, G64, but nothing changed.
When I check the pid.0.error (X axis) and pid.1.error (Y axis) on halscope it
seems to me the axis.1.motor-pos-cmd don't wait to the axis.0 to reach their
destination (X50) and starts to move. So the X and Y axis move the same time. I
think the trajectory planner don't use the axis.N.motor-pos-fb to wait the
exact stop. Just send the command one after other.
Where is the bug? HAL, parameters, SW or where...
Thx, Tamas Konya
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