Requirement deep hole drilling

For good hole drilling results, cooling, lubrication and high-pressure coolant systems are required.

Single flue gundrilling cannot only be achieved on deep drilling machines but is also very good on machining centers (drilling, turning and milling center) with:

• Deep-hole drilling oil,
• Emulsion (min. 10 - 12 % concentration, with additives),
• and under conditions, with a minimum quantity air/lubrication system.


Drill guide

The asymmetric goemetry single-edged single flute gundrill is nit self-starting, therefore a pilot hole or drill bushing is required.

Drill bush

Bohren mit Bohrbuchse 01

Recommendation: Bushes DIN 179A medium

Important: Drill bushing has a form set against the workpiece

Pilot drilling

Bohren mit Pilotbohrung 01

Recommendation: pilot drill with m7 tolerance

The prevent outbreaks during retraction of single flute gundrill we recommend a chamfer (X) of 60°.

Important: Too big difference between the tool and drill bush or pilot hole can cause the following problems:
• poor hole quality
• excessive hole straightness deviation
• drill breakage



Deep drilling machine

deep drilling machine


Machining center

machining center


• Make a pilot hole
• Enter with stationary spindle or speed < 50 rpm
• Set coolant pressure, speed and feed
• Continuous drilling to depth without peck
• Switch off coolant supply after reaching hole depth
• Retraction with stationary or < 50 rpm

Important: Failure to comply may result in tool breakage.


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