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Surface quality

The arising radial chip cutting forces are transmitted via the supporting strips to the bore wall. This produces press-smoothing of the surface. This effect can be further intensified by the design of the supporting strips. The result is excellent surface quality.

The result:

Surface quality
Fig.: surface quality

Diameter tolerance

Diameter tolerances up to IT 7 can be achieved with TBT single-lip drills.

Bore off-centre

The drill bush or pilot bore bearing against the tool, and the bore itself, give the single-lip drill exact guidance, so that the bore course remains within minimised tolerance limits.

Bore off-centreFig.: Bore off-centre (standard values)
Legend for Figure:
Horizontal axis: Drilling depth in mm
Vertical axis: Off-centre in mm
Upper graphic: Rotating tool
Lower graphic: Rotating workpiece