Back Spotfacing up to 2.3x Bore Diameter

Allows back spotfacing or back counterboring in one operation without turning the workpiece
Simple swing mechanism combined with the internal coolant pressure system (min. 20 bar) is
  granting a high tool capability
The tool works vertically and horizontally
Blades available in all dimension, with different coatings in carbide as well as in high-speed steel quality



How Does the BSF Tool Work?

1. While under coolant pressure, the control pin is forcing the blade (red color) to retract into the
blade housing.
2. During the blade movement, the pressure surface of the blade turns away and the control pin (while
still under coolant pressure) which is now on the blade curve, forces the blade to fully retract.
3. The control pin holds the blade in the retracted position and the tool may be moved in the axial
direction (Z-axis).
4. When switching off the internal coolant pressure and starting the spindle rotation (recommended
activation speed) the blade swings out into working position. The coolant is reaching the cutting
edge through the coolant-flushing bore. When the counterbore operation is finished, the tool must
be programmed down into the starting position behind the workpiece. Now, activating internal
coolant pressure, the blade is retracting again.


We supply an assembly pin (1) for the BSF blade change. Use the stepped end of the assembly pin (2)
positioning the assembly pin with the slot free end on the split pin. Press the assembly pin in until the split
pin falls out and the blade is free.

Insert the blade. Then insert the split pin and fix the blade (3). With the flat side of the assembly pin,
push in the split pin until it is flush with the blade housing diameter (4). Blade is fixed in place.

The blade must move freely. If it is not, dismantle the blade and repeat the steps listed above. The
blade and blade housing must be checked for soiling.

After an extended time, check that the blade moves about freely. Dried oil, coolant or dust may cause
the blade to stick.

Every time the blade is changed the split pin must be replaced (pin is included in blade shipment).
Using a split pin several times may cause blade fixing problems.




Independent spotfacing and countersinking, front and back in One Operation.
Stock Standard Tools up to 30mm (1.181") through hole (Max. ratio = Ødx2 - 1mm)

Spotfacing, counterboring, or countersinking on the back of a through hole

• Needs no anti-rotation device or machine adaptation
• Ready for immediate use
• Simple to program
• Low maintenance

Click Here to Open and Print SOLO Application Data Sheet (email to



Front and back spotfacing and formsinking tool. The SOLO tool functions reliably without an anti-rotation device, change of spindle rotation, coolant pressure or contact mechanism. The SOLO tool is immediately ready for operation on any machine (CNC, transfer, multi-spindle or conventional machine).

The completely closed tool design (tool head) prevents any coolant contamination. In addition, the pin driven cutting blade, which moves in and out radially, prevents chips from jamming the system.

How Does the SOLO Tool Work?

There are two different models of the SOLO tool, the SOLO 1900 and the SOLO 2. Each tool is capable of reaching counterbore sizes two times the bore diameter minus 1mm. Possible applications up to 30mm through hole. (Max ratio = Ødx2 – 1mm).

The SOLO 1900 uses two centrifugal weights installed in a sealed tool head with an activation speed rate of 1900 rpm, the weights start moving outwards and turn the gearwheel. The gearwheel drives the blade out by rotating the blade control. When the spindle is stopped, a pull back spring pushes the centrifugal weights back to the center and retracts the blades.

The SOLO 2 uses similar parts, but works in the opposite way. With an activation speed rate of 2000 rpm or higher, the blades retract when the centrifugal weights move. When the spindle rotation is below 1500 RPM, the weights are pushed back to the center and the blade is fixed in the cutting position.


Rigid spotfacing and counterboring, front and back in One Operation.
Minimum bore is Ø8mm. Maximum bore is Ø80mm. Maximum Counterbore = 2 x bore–1mm

• Spotfacing, counterboring, or countersinking, forward and backward in a single automated operation.

• Positive control of extension and retraction of blades by changing the direction of rotation.
• Anti-Rotation arm adapts to spindle face to control activation.

• Operates as slow as necessary to machine exotic materials.

Click Here to Open and Print GH-Z/E Application Data Sheet (email to

Modular Cutting Tool with Coolant Through

Each GH-Z Reverser System is modular and is available with coolant through the center. Each unit consists of a tool head, control, housing and cuttin glbade or Cassette with indexable cutting inserts. There are three standard tool heads with weldon shanks. V-tapers adaptations or other precision HSK or ABS shanks are optional. The housing, controland cutting blade configuration is designed specifically for each hole and counterbore application to guarantee the strongest tool possible.

Large Ratio Cuts

Counterbore sizes are capable of reaching 2 times the bore diameter minus 1mm in almost any material and part configuration. Close tolerance insert cartridge holders and housing pockets have proven to add rigidity for exceptional surface finishes even in interrupted cuts. Large ratios require a single cutter for added stability.

GH-Z = 2 effective cutters
GH-E = single cutter

How Does the GH-Z/E Tool Work?

The compact tool head contains the mechanical control for blade activation. The integrated braking system, which is fixed by the anti-rotation device to the machine, guarantees a defined position of the blades. Depending on spindle rotation, the cutting blades will extend or retract perpendicular to the bore axis. Pass through the bore with counterclockwise rotation. After the blades pass beyond the workpiece and any side wall, active the spindle clockwise. The blades extend automatically. Feed back into the work piece to counterbore depth, push out of the bore and reverse the spindle to retract the cutting blades. The back spotface is now finished.


Need Some Help? Find Your Local HEULE Representative 

Deburring: COFA | SNAP     Chamfering: SNAPDEFA     Countersinking:  SOLO | GH-Z/E | GH-K  

Spotfacing:  BSF | SOLO | GH-Z/E     Counterboring: BSF | SOLO | GH-Z/E     Drilling: VEX-S | VEX-P | COMBI

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