Boring

Boring hardened materials requires a large cutting pressure, so it is often necessary to multiply the torsional and tangential forces on the boring bar. With positive rake angle (35 ° or 55 °), small tip radius inserts can reduce cutting pressure. Increasing cutting speed while reducing cutting depth and feed speed is also a way to reduce cutting pressure.

When boring, the tool must be concentric with the part or slightly above the center of the part, because the deflection caused by cutting reduces the position of the actual centerline. The best form of clamping is a full-length split sleeve. When boring hardened materials, the full-length split sleeve chuck provides the highest toolholder stiffness. Followed by spring collets and single-point screw collets.