WEBVTT

1
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The cutterhead carries the disc along its face track.

2
00:00:04.000 --> 00:00:08.000
Contact causes the disc to rotate about its own axle.

3
00:00:08.000 --> 00:00:12.000
Under pure rolling, track speed and diameter set disc rpm.

4
00:00:12.000 --> 00:00:16.000
Seizure or slip invalidates the pure-rolling model.