How accurate are drill holes with BullseyeBore Core?

Drilling accuracy is defined as the angle of a drill hole with regards to the plane of the worksurface. A perfectly drilled hole will be perpendicular to its worksurface. This is what we refer to as a “straight hole”.

The ability to drill a straight hole will depend on several criteria including the quality of both the drill and drill bits, the worksurface material, as well as the drill operator’s ability to properly use the drill. Of course, it will also depend on the drill operator’s ability to correctly install and utilize BullseyeBore Core on the drill during the drilling operation.

Since “skills and drills” vary, BullseyeBore Core alone cannot ensure that everybody can rise to Pro level, but we’ve found that an average DIY can typically drill with an error rate on a flat wooden worksurface of less than ±1 degrees after just 10-20 minutes of initial BullseyeBore Core use. Moreover, we’ve found that experienced DIY users can typically achieve an error rate of under ±0.5 degrees with BullseyeBore Core when used on a regular basis. That equates to a drill hole that is between 89.5° and 90.5° accurate in both the X & Y directions (with 90° as perfect).