The further the tool does its work from the spindle, the more room for error. Deep pockets and cavities usually signify that a part is nearing completion, making the smallest of errors almost impossible to recover from and very costly.
The return on investment from digital boring comes from the time saved making adjustments on the spindle, as well as the increased adjustment accuracy.
A pilot or spot drill, also known as a starter drill, is typically required when the succeeding drill is longer than 10xD or smaller than Ø 1.00 mm. Starter drills can also be used to improve hole location due to their short, rigid geometries.
The high-performance Nirox drill is available in diameters from 0.30 - 3.00 mm. It was developed for use at low cutting speeds and unstable environments.