Gentlemen,
Having the problem on 4 mpg's (three single and on diff) I am relatively
sure the problem isn't hardware.
Halshow (watch) shows the encoder counts accurate and ilowpass counts are
incorrect I suspect ilowpass.
ilowpass is so simple it is almost impossible to see how it could be
incorrect also it has run correctly on the same machine for years without
problems.
I blame the change that was made and that is the new operating system and
the new LinuxCNC version.
The hal file shows everything running on the servo thread. It is the same
hal file as before.
I moved the ilowpass down the list to right in front of the write statement.
I have the same result.
The initial direction loses a count.
ppmc encoder count moves 4 each detent.
ilowpass moves 3 for the first move and 4 thereafter
motion reversal resyncs the counts until zero is reached
reversing again loses a count again as long as zero has not been passed
results as follows
start machine
encoder count = 0
ilowpass in = 0
ilowpass out = 0
move positive one click
encoder count = 4
ilowpass in = 4
ilowpass out = 3
this relationship is maintained while moving in the same direction for as
far as I moved
upon motion reversal encoder count, ilowpass in, and ilowpass out are the
same until I pass 0
the next click past 0 the count then becomes
encoder count = -4
ilowpass in = -4
ilowpass out = -3
and it maintains this relationship until motion reversal
upon motion reversal the counts are the same again until I go past
zero.
The same but opposite behavior depending on counts being positive or
negative.
all comments/suggestions welcome
thanks
Stuart
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