We run into a problem on a 3 axis mill.
We understand that the default mode for EMC2 is G64. (I think this is not a
very good practice, especially for mills.)
Our problem is that we cannot switch from that mode.
We tried to put the G61 or G61.1 command into the lines.
A video, that shows the problem can be downloaded from
http://www.hex.hu/cncvideo/g61g64.mp4
It is about 1.5MB. It is recommended to download and magnify it in a
separate player.
Please note the following:
Theoretically one axis should move at a time.
The cursor that represents the mill bit works/moves correctly, although the
theoretical position is way ahead of the actual motion. Listen the sound of
the machine.
Although one axis should move at a time, due to the constant speed mode 2
axis is moving what is a big mistake for us.
At the speed of 2100 mm/min the error from the theoretical path is huge
around 50mm (2 inches) or so. Same problem in smaller scale if the machine
is slower.
Changing the G64 mode to G61 or G61.1 or G64P0.01 mode does not change
anything.
The version of the EMC2 is 2.2.4.
The machine has digital servos capable to operate at 1MHz. (step/dir)
The machine if it operates at slow speed and there is a Pause command issued
at the endpoints, than works better in fact is very accurate at the end
points.
There is a feedback line from the glass scale(s) and there is a
reader/display unit that show independently the actual position from the
glass scale.
After a 96 hour continuous milling job the machine returns to 0.0000 with no
misalignment at all both the internal and external counter shows the same.
Since the theoretical path and the actual movement significantly differs -
see the XYZ values and the cursor in the black square - and the G61,G61.1
command does not change that it is possible that there is a bug in the
trajectory planner.
Any idea how can we force the EMC2 to execute either the G61 or the G61.1
command and switch the sw. to that mode?
Thanks.
JD.
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