Tungaloy’s TinyMiniTurn mini boring bar tool line for small bore applications now offers CBN tipped boring bars for machining hardened steel parts.
TinyMiniTurn offers a wide range of geometry types and grades that provide excellent performance in small diameter boring applications. The line boasts a full range of solid carbide mini boring bars that allows machining from as small as 0.6 millimeter (.024 inch) diameters, as well as indexable boring tools that use a tiny insert in the inscribed circle of 3.57 millimeters (9/64 inches) or 3.97 millimeters (5/32 inches).
New CBN-tipped mini boring bars feature BX310 uncoated CBN grade that increases the grade’s wear resistance when used at low to medium cutting speeds, making it perfect for machining small bores from as small as 2.8 millimeter (.110 inch) diameter of hardened steel parts.
The JBT-style cutting edge geometry of the new bars incorporates a 98 degree point angle that allows the single geometry to be used in multiple applications, including boring, profiling, and chamfering. Furthermore, the boring bars feature an edge preparation of 0.13 mm (.005″) x 15° chamfer, providing the cutting edge with edge-line security and robustness.
The new CBN boring bars are equipped with internal coolant channel for through-coolant capability. This feature allows the coolant jet to be directed exactly to the optimal position accurately to cutting point for increased tool life and chip control, which was difficult with conventional external coolant supply method, during small diameter boring operations.
This content was first published on the Tungaloy website.