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  1. #5
    Just thinking aloud here.

    Maybe a measurement of forces on the machine structure could be used instead ? Buy Strain Gauges RS 5mm Wire Lead Strain Gauge, 120Ω, -30 to +80°C, 9.5 x 3.5mm RS N11MA512023 online from RS for next day delivery.
    Following calibration a lookup table could be used to determine feedrate values for the selected tool/material/speed.

    There are going to be limitation of course, for example I sometimes use a 1mm cutter, the machine would destroy it with virtually no measurable changes. Somewhere in the middle there might be a linear part of the graph where a system would work.
    Last edited by EddyCurrent; 02-05-2014 at 01:40 PM.
    Spelling mistakes are not intentional, I only seem to see them some time after I've posted

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