Example encoder application: Milling machine！

Consider a milling machine that moves linearly to position itself over raw material — and rapidly rotates a drill to bore holes. Because two types of motion are present, there are two points at which an encoder can track the machine’s material removal. More after the jump.

Two encoder options are to either measure output-axis motion through the ballscrew shaft with a rotary encoder or directly measure linear motion through a linear encoder. Some applications — such as a milling machine, for example — need the latter. That’s because one rotary encoder can’t compensate for thermal expansion (top image). Here, a linear encoder also helps track any displacement (bottom image)

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