Kirk Wallace wrote: > There are others on this list much more qualified to comment, but there > might be a hint that your encoder has some noise. Here is one of my > HALscopes: > http://www.wallacecompany.com/cnc_lathe/HNC/emc2/pid_x-1b.png > > His encoder is BOUND to have a lot of positional quantization noise, as it is a 100 um resolution linear scale, which is equal to roughly .0004". This is the typical DRO-grade scale, and while his CNC machine apparently was made by Anilam with that scale, that is only 2540 counts/inch. This Halscope result he showed was not bad for this scale, at least the part shown seems to have a peak-peak error of less than 3 encoder counts, which is about as good as it gets (assuming I'm reading the picture correctly). The vertical scale on pid.0.error is 20m, which is 20 milli- times a millimeter, or 20 um.
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