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Heule Precision Tools’ manually actuated BSF is designed for back spot facing applications where coolant flow is too weak to actuate the blade and air supply is either unavailable or inconsistent. The blade can be retracted by manual collar and will swing out with the help of the activation speed.

The BSF manual was developed specifically for instances where traditional actuation methods were ineffective, including when coolant is not available through the spindle, when through-spindle air is either unavailable or not programmable, when less than 280-psi pressure is available or when filtration is poor. It is well suited for counterbores up to 2.3-times the through-hole diameter. Standard sizes are available in 6.5 mm to 20.5 mm (0.256" to 0.807"), with specials available from 6 mm to 40 mm (0.236" to 1.575"). Safer and more reliable than bayonet-style tooling, the BSF manual is said to be well suited for large boring mills and other open-air machines.

This specialized tooling works without an anti-rotation device, change of spindle direction or any machine adaptations, enabling components to be spot faced in the same direction as the bore is drilled. This saves the time and cost of turning the workpiece, while allowing the spot facing of difficult-to-reach areas like casting flanges, bolt-head faces and more. The tool works both vertically and horizontally, with replaceable carbide-coated blades for extended tool life. They are designed for gear housings, yokes, engine casings, compressors, aerospace components and other parts in a wide range of materials.

Existing BSF tools can be modified by exchanging the shank to allow manual activation, as the housings, controls and blades are identical to the standard BSF range.