Hi Nasir,
I had a similar problem using EMC1 RC_46, but it was not a software
problem. I am/was using a Motenc-100 board. The problem was traced to encoder
signals. This was about 1 1/2 years ago. I had an X axis and Y axis using the
same encoder type, and a Z axis with a different encoder. The Z and either the X
or the Y (can not remember which one) were accurate. But the other of the X or Y
would accumulate error. This was very confusing, as an identical axis setup was
working flawlessly. I eventually tracked down the problem by looking at signals
with an oscilloscope. But, I do not remember the specific error. Dave might
remember the day when I was on the Chat figuring this out with others helping.
This was after some PID tuning to get things working. With PID
values that are way out there was all sorts of wierd crashing and operation.
With the PID values close, the system was stable, but there was this
accumulation of error, similar to what you say.
For those out there not familiar, Excellon is the premier PCB
drilling machine company. These machines are where all those 1/8 inch shank
drill bits are used. And also where allot of the surplus 60 K RPM spindles come
from. These machines typically drill a stack of 4 to 6 PCB's at a time.
Nasir, is the 1 mm error on one axis or both ?
73, Don...
Subject: [Emc-users] EMC2-Motenc-Lite
Dear All.
Thanks for the previous help on the start of EMC2 with
Motenc-Lite.
EMC2 is running on P-III with Motenc-Lite PCI Card.
I/O and xy servo drive control is ok on EXCELLON EX-200 PCB
Drilling Machine,
Homming is OK
Following Small Program with G0 show approx 1mm extra travel
upon end of program each time, i.e. it contineously accumelate.
This error dose not show on the display but shows on the
slide table.
Re-Homming take out this error.
Please also advice how to tune PID Sevo Loop.
Program:
G20
G64
G0X0Y0
G0X100Y100
G0X50Y50
G0X0Y0
M2
Please reply.
Thanks
Nasir
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