BB732 boring bridges: One tool, dual purpose for deep hole precision

Seco® announces the launch of the BB732 boring bridges, a modular solution
designed for deep boring operations with Steadyline® bars. Engineered for both roughing and finishing
tasks, BB732 bridges deliver vibration-free performance, optimal coolant flow, and exceptional surface finish
all in one tool.

Combining reliability, sturdiness, and cost efficiency
The BB732 boring bridges are tailored for use with the Steadyline SM40 shell mill holder, supporting
diameters from 114mm to 301mm for roughing and up to 315mm for finishing. The conical-reinforced shape
of the holder ensures high static and dynamic rigidity, up to three times greater than solid holders, while the
Steadyline vibration damping system enables stable, high-precision machining even in demanding
conditions.
Coolant directed straight to the cutting edge
“The BB732 boring bridges are designed to work seamlessly with Steadyline bars, especially the SM40
series, for deep boring jobs with larger diameter bars. One of the standout features is the optimized coolant
flow – it’s directed right at the cutting edge to help break up chips and keep the insert cooler,” said Kavita
Dandge, Global Product Manager Machine Solutions.
The BB732 bridges eliminate the need for separate tools for roughing and finishing, reducing inventory and
setup time. With a built-in safety stopper to prevent block ejection due to centrifugal force, the system also
prioritizes operator safety.