Seco Introduces BB732 Boring Bridges for Dual-Purpose Deep Hole Precision!

Seco has launched the BB732 boring bridge system, a modular tooling solution designed to simplify and stabilise deep boring operations by combining roughing and finishing capabilities into a single setup. Developed for use with Steadyline boring bars, the BB732 bridges address one of the most persistent challenges in deep hole machining—vibration—while delivering high accuracy, consistent surface quality, and efficient chip control.

The BB732 boring bridges are compatible with the Steadyline SM40 shell mill holder, supporting a wide range of machining diameters. For roughing operations, the system covers diameters from 114 mm to 301 mm, while finishing operations can be performed up to 315 mm. This broad operating range makes the BB732 suitable for large and complex components commonly found in industries such as energy, heavy engineering, aerospace, and general industrial machining.

A key feature of the BB732 system is the conical-reinforced holder design, which delivers exceptionally high static and dynamic rigidity—up to three times greater than conventional solid holders, according to Seco. This enhanced rigidity is critical in deep boring applications, where tool overhang and cutting forces can easily lead to chatter, dimensional inaccuracies, and poor surface finish.

Stability is further enhanced by Seco’s Steadyline vibration damping technology, which actively suppresses vibrations during machining. By maintaining stable cutting conditions even at long overhangs and under demanding cutting parameters, the system enables vibration-free performance and supports high-precision machining in both roughing and finishing passes.

Coolant management has also been optimised in the BB732 design. Coolant is directed straight to the cutting edge, improving chip evacuation and reducing heat build-up at the insert. Keeping inserts cooler not only extends tool life but also helps maintain consistent cutting performance and surface finish throughout the operation, particularly in deep bores where heat accumulation can be problematic.

One of the major advantages of the BB732 boring bridges is their dual-purpose capability. By eliminating the need to switch between separate roughing and finishing tools, the system helps reduce setup time, tool changes, and inventory complexity. This consolidation supports leaner tool management and faster cycle times, making the BB732 particularly attractive for production environments focused on efficiency and repeatability.

Operator safety has also been addressed through a built-in safety stopper, which prevents the boring block from being ejected due to centrifugal force during operation. This feature adds an important layer of protection, especially when machining at higher spindle speeds or with large-diameter setups.

Overall, the BB732 boring bridge system reflects Seco’s focus on delivering process security, precision, and productivity in challenging deep hole applications. By combining high rigidity, vibration damping, effective coolant delivery, and dual-purpose functionality, the BB732 offers manufacturers a practical and efficient solution for achieving reliable deep boring performance with fewer tools and greater confidence.