Roughing a keyway.
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Previously:
https://www.homemadetools.net/forum/...982#post160467
https://www.homemadetools.net/forum/...029#post187459
https://www.homemadetools.net/forum/...054#post180050
https://www.homemadetools.net/forum/...679#post186264
https://www.homemadetools.net/forum/...914#post175604
