This example shows a servo driven flying, cut-to-length,
extrusion cutter. The left-to-right servo drive "follows"
the measured extrusion velocity. The anvil beneath the extrusion
"follows" the belt servo. The conveyors match the
extrusion velocity. The knife up-down movement is triggered
at the beginning of every cut and can be controlled to give
a sharp fast cut or a gradual cut.
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