Can the extended versions of BullseyeBore Core operate with drill bits longer than 8"?

Yes, the extended versions of BullseyeBore Core (CR1-101 or CG1-101) have been successfully tested with drill bits longer than 8”. However, the diameter of the Alignment Patterns is proportional to the length of the bit, so longer bits produce larger Alignment Patterns on the work surface. This means that 1) the work surface must be large enough to support all or some portion of the Alignment Patterns, and 2) the inner most Alignment Pattern must be close enough to the Reference Pattern to utilize. If the inner most Alignment Pattern is too far from the fixed Reference Pattern, concentricity can be difficult to visualize. A common solution to this problem is integration of a Chuck Extension, which is designed to reduce the Alignment Pattern size with longer drill bits so that it is closer to the fixed Reference Pattern. See the FAQ section for Chuck Extensions for more information.