Scientific Cutting Tools BB71 Radial Relief Boring Bar

Product Description

The SCIENTIFIC CUTTING TOOLS BB71 is a radial relief boring bar designed for precision internal turning and bore finishing operations on small-diameter workpieces. Machined from submicron-grade solid carbide, it delivers the rigidity and wear resistance required for tight-tolerance bores. The BB71 handles a minimum bore diameter of 0.075 inches and a maximum bore depth of 0.125 inches, with a 0.125-inch shank diameter and an overall length of 1.5 inches. The uncoated carbide cutting edge is suited for applications where dimensional accuracy and surface finish are critical. This tool is installed and used by machinists and tool-and-die professionals working on CNC lathes and manual turning equipment.

The BB71 is applied in precision machining environments where very small bore diameters must be held to close tolerances. Its right-hand cut configuration suits standard lathe spindle rotation for internal boring passes. Typical use cases include small-diameter bore finishing, counterbore work, and internal profiling on components such as hydraulic fittings, medical device parts, and instrument housings. The compact geometry makes it effective in Swiss-type and conventional CNC turning centers handling miniature or micro-scale workpieces.

Key Features

• Submicron-grade solid carbide construction for superior hardness and edge retention
• Minimum bore diameter of 0.075 inches suits micro and miniature boring applications
• Maximum bore depth of 0.125 inches with a 0.125-inch shank diameter
• Right-hand cutting direction for standard lathe spindle rotation
• Radial relief geometry reduces cutting forces in tight-bore conditions
• Uncoated finish allows direct use without additional prep on most workpiece materials

Compatibility

Designed as an OEM-style precision boring bar for use in CNC turning centers and manual lathes accepting a 0.125-inch shank diameter tool holder or boring bar block.

Installation Notes

Installation should be performed by a qualified machinist familiar with small-diameter boring bar setups. Ensure the machine spindle is fully stopped and the tool holder is properly torqued before beginning any setup. Minimize bar overhang to reduce deflection and chatter when working at the maximum bore depth. Verify workholding and tool alignment before initiating a cut to protect the carbide edge from shock loading.