On Tue, 2013-08-06 at 18:14 +0100, andy pugh wrote: > On 6 August 2013 18:02, Stuart Stevenson <[email protected]> wrote: > > If the scale is off that far you may want to exchange it for a correctly > > functioning scale. > > I think the question is how to isolate the problem. > Between the scale, the interpolator, the 7i77, 7i25, LinuxCNC and PID > controller there is quite a lot that could be wrong. > Being one of those simplistic guys I think I would back into the problem. Adjust the scale in linuxcnc to read correctly on a known distance (gage blocks). Then check for linearity. If that works then it is probably time to have a discussion with Heidenhain. YMMV
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