Enter the drill diameter, the cutting speed and the feed per revolution and get the spindle speed, the feed rate, the metal removal rate and the time to drill a hole of a given depth. Add a specific cutting force kc from your tool maker catalog for torque and power. Metric or inch. Runs entirely in your browser.
kc is always entered in N/mm², in both unit systems. Power and torque are net values at the cutting edge for steady cutting. For tap drill sizes see the tap drill chart.
The spindle speed follows from the circumference of the drill, the feed rate from the feed per revolution, and the removal rate from the area of the hole times the feed rate:
In inch units n = 12 × SFM / (π × D), vf in ipm and Q in in³/min. We convert with 1 ft = 0.3048 m, 1 in = 25.4 mm and 1 in³ = 16.387 cm³. The optional power uses the same relation as the metal removal rate and power calculator, Pc = Q × kc / (60 × 10³), and the torque is Mc = Pc × 9549 / n with Pc in kW and n in rpm.
The time is the cutting stroke at constant feed. Spot drilling, the approach, the retract, chip-breaking pecks and dwell all come on top, and feed is often reduced at entry and exit. The point length of the drill also adds to the stroke when you need a full-diameter hole to the stated depth, so enter the depth you actually have to travel.
n = 1000 × vc / (π × D), with vc in m/min and D in mm. A 10 mm drill at 80 m/min runs at about 2546 rpm. In inch units n = 12 × SFM / (π × D), so a 0.5 in drill at 250 SFM runs at about 1910 rpm.
The feed rate is vf = fn × n, the feed per revolution times the spindle speed. At 2546 rpm and 0.2 mm/rev that is about 509 mm/min. The time to drill a hole is the depth divided by the feed rate, so 30 mm takes about 3.5 seconds. The page counts the cutting stroke only, so add approach, retract and any peck cycle on top.
Net cutting power is Pc = Q × kc / (60 × 10³), with the removal rate Q = (π × D² / 4) × vf / 1000 in cm³/min and kc in N/mm², which gives kW. This page carries no kc table, because kc depends on the workpiece material and condition. Take it from the catalog of the drill you run. The thrust force needs its own coefficient from the same catalog, so we do not estimate it here.
This page turns tool data into machine settings. Which drill type, grade and starting speed suit your material and hole depth is the advisor's job, grounded in catalog data and brand-neutral.
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