Boring

Boring is a finishing operation that uses a single-point tool to enlarge and true up holes that were previously drilled or cast, achieving dimensional accuracy and straightness that drilling alone cannot deliver. Unlike drilling, which relies on the geometry of a two-flute drill bit, boring uses a simple cutting tool inserted at the hole’s center, making it ideal for achieving tight diameter tolerances and improving runout on critical fastener holes.

This operation is especially important when producing components that require holes with concentricity to other features, such as shaft journals or precision equipment bases. In production CNC machining, boring is often followed by reaming for applications demanding exceptional surface finish and size control.

The rigid setup of a CNC machining center allows boring operations to achieve roundness and straightness improvements that are critical for bearing or bushing bores.