Heule introduces the manually actuated BSF 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 the many 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 ideal for counterbores up to 2.3 x through-hole diameter. Standard sizes are available 6.5mm to 20.5mm (0.256” to 0.807”) with specials available to 6mm (0.236”) to 40mm (1.575”). Safer and more reliable than bayonet style tooling, the BSF manual is ideally suited for large boring mills and other open-air machines. They are stocked in the Cincinnati, OH warehouse, and available for same day shipping.
This unique tooling works without an anti-rotation device, change of spindle direction, or any machine adaptations, allowing components to be spot faced in the same direction as the bore is drilled.  This saves the time and cost of turning the work piece, 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 ideal for gear housings, yokes, engine casings, compressors, aerospace components and other parts in a wide range of materials.
Operation is simple and straightforward. Position the tool above the top material surface, with spindle stopped. Ensure that the activation ring is in the locked position. With blade locked in place, feed the tool through the hole. Only operate the activation ring when the spindle is at a standstill.
Next turn the activation ring to the unlocked position. By starting the spindle rotation, the blade folds out into the working position when the activation speed is reached.
Position the tool in rapid feed with working speed until approximately 1.0 mm below the back of the workpiece surface (attention to burr height and part configuration). Start machining in working feed. Continue machining to desired counterbore depth.
When the Counterbore depth has been reached, feed out of the counterbore far enough to allow blade to fold in without interfering with the part.
With spindle stopped, turn the activation ring to the locked position, retracting the blade. Fed the tool out of the workpiece.
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.