Online Tips Index / General Shop Tips / Straight and Tapered Plug Cutters
Straight and Tapered Plug Cutters
Basically, there are two types of plug cutters. One cuts a plug with straight sides. And the other creates a gradual taper on the sides of the plug, see photos.
Straight Plug Cutters
Most of the time, a straight plug cutter produces a plug with a consistent
diameter, so you get a pretty good fit. But if there's any runout in the
drill press, the plug will vary in size. This can create a gap when you tap
the plug in the hole.
Tapered Plug Cutters
A tapered plug cutter solves this problem. As its name implies, it cuts a plug with tapered sides. So even if there's a bit of runout in the drill press, the tapered sides allow the plug to wedge tightly in the hole.
In addition, a tapered plug cutter creates more of a shearing cut than a straight plug cutter. Because of this, there's very little chipout on the sides of the plug, so you don't end up with a gap around the plug.