The clamps on mill fixtures must be extremely rigid. Because cutting forces exerted by a milling cutter may change as the cutter enters or leaves the work and throw an extra load on clamps as shown in the following figure. Clamps must not loosen by vibration caused by interrupted cutting of the mill cutter. Interrupted cutting occurs especially at the beginning and end of the cut. Figure: Work is lifted up at the beginning of cut Figure: Work is forced down at one end but lifted up at the other
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