While I normally trepan nowadays on the Tormach using an end mill I recently trepanned old school on my manual lathe. Trepanned a 6.25" diameter plug from 10" x 1" 6061-T6 round on the lathe using a Val-cut 8mm trepanning tool under carriage power feed. Spindle 75 RPM, carriage feed 0.0023"/Rev, Relton A9 used as cutting fluid. No G-code was sacrificed for this procedure.


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