Trepan Tool Harbor Freight Milling Machine Trepanning a Groove

Harbor Freight Milling Machine Trepanning a Groove with a homemade trepan tool. A trepanning operation on a machine tool is basically hole cutting whilst leaving the core. Like a hole saw a trepan tool will remove a disk or cylindrical piece of usable stock. The Harbor freight milling machine can a hole using a trepanning tool of just under 13"

Trepanning holes or grooves on a milling machine or lathe is often preferred to drilling as it takes less horse power for the same diameter hole. The trepan tool used here looks like a cut off or parting tool with the side angles relieved to match the radius of the circle being cut.
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