Gun drill / deep-hole drilling (single-lip)

L/D > 10 - internally cooled, high pressure. n + vf + recommended coolant pressure.

Single-lip (gun) drills don't self-center - spot-drill first or use a guide bushing: spot Ø ≈ drill Ø, about 1×D deep, a flat perpendicular start face. Otherwise the drill wanders or breaks.

Note: all cutting and material values are guide values. The tool or machine manufacturer's recommendations are decisive.

The calculator also runs in the workshop without a connection: app and desktop version