subject: Internal Boring Tool: Types, Uses & Selection Guide [print this page] Internal Boring Tool: Types, Applications, and Machining Tips Internal boring tool selection is important for achieving accurate hole diameters, consistent dimensions, and smooth surface finishes in CNC machining. Boring is commonly used to enlarge and finish an existing hole created through drilling or casting. Choosing the right tool depends on the workpiece material, hole depth, required tolerance, and machining conditions.
What Is an Internal Boring Tool? A boring tool is a cutting tool used to enlarge an existing hole and improve its dimensional accuracy. Unlike drilling, which creates a new hole, boring refines an existing one to meet specific engineering requirements. In CNC turning, a boring bar holds a cutting insert and extends into the workpiece to machine its internal surface. A suitable CNC boring tool helps control cutting accuracy, reduce dimensional variation, and achieve the required finish. Tool rigidity and correct alignment are particularly important when machining deep or narrow holes.
