Hi,
  I wonder if someone could help me diagnose an issue I have with trying to use 
a low pass filter to stabilise the pyvcp spindle speed display in Axis, I got 
the idea from here http://linuxcnc.org/docs/html/examples/spindle.html

With the low pass filter in place the speed is displayed for a few seconds then 
goes to “nan” and the following is output on the terminal I launched machinekit 
from

Exception in Tkinter callback
Traceback (most recent call last):
  File "/usr/lib/python2.7/lib-tk/Tkinter.py", line 1437, in __call__
    return self.func(*args)
  File "/usr/lib/python2.7/lib-tk/Tkinter.py", line 498, in callit
    func(*args)
  File "/usr/lib/python2.7/dist-packages/vcpparse.py", line 154, in updater
    a.update(pycomp)
  File "/usr/lib/python2.7/dist-packages/pyvcp_widgets.py", line 1219, in update
    end, self.bh-1)
  File "/usr/lib/python2.7/lib-tk/Tkinter.py", line 2205, in coords
    self.tk.call((self._w, 'coords') + args)))
ValueError: could not convert string to float: floating

If I remove the lowpass filter then the speed is displayed fine (apart from the 
jitter).

My config files can be found here 
https://github.com/russellgower/Lathe-Config.git

Thanks
  Russell

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