What or how are you determining the corrections?
If you are using a glass scale, one could write a program to move the axis
slowly while recording 256 points of the motor encoder and glass scale encoder
then moving in the opposite direction doing the same thing. The glass scale
would be considered the nominal though you have to watch the accuracy grade-for
instance Heidenhain LS 603 (you would find these on manual mills ) are +- 10um
( 0.0004 inches). LS 476 can be +- 3 um or 5um and LF 103 are 3um or 2um
(+-.00012 or .00008 inches) the best I can find in the book) - though they
should be consistent (thermal expansion is known).
If you are manually measuring to a known point I guess you would have to stop
and key in each correction.
What other common ways are there to do this?
Chris Morley
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