Formula
- n = (Vc × 1000) / (π × D)
- Vf = f × n
About this calculator
Part of our Machining & CNC Calculators collection. Cutting speed, feeds, RPM, cycle time, and tap drill charts.
How it works
Drill RPM uses the standard Vc-to-RPM formula. Feed rate equals RPM times feed per revolution. Lower cutting speeds are typical for drilling compared to milling because chip evacuation and coolant access are harder in a hole.
Enter your values in the inputs above and click CALCULATE. Results appear on the right without a page reload. No login and no server upload.
Worked example
12 mm drill, 25 m/min cutting speed, 0.15 mm/rev feed.
- n = 25 × 1000 / (π × 12) = 663 RPM
- Vf = 663 × 0.15 = 99.5 mm/min
Result: 663 RPM, 99.5 mm/min feed rate.
When to use
- Setting drill press or CNC drill RPM and feed
- Checking peck drilling cycle feed values
- Comparing small vs large drill speeds
Limitations
- Deep holes may need pecking and reduced feed
- Stainless and exotic alloys need lower Vc than mild steel
- Does not check drill point angle or coolant through tool requirements
FAQ
- Why is drilling Vc lower than milling?
- Drills have poor chip evacuation and uneven tool engagement. Catalog values are typically 40 to 60% of milling speeds for the same material.
- What is feed per revolution?
- Axial feed in mm for each spindle revolution. Total feed rate Vf = f × RPM.
- Should I use peck cycles?
- For holes deeper than 3× diameter, peck to break chips and allow coolant in. Reduce feed if chatter or work hardening occurs.
Privacy and accuracy
Every calculation runs locally in your browser. Your design data never leaves your device. Results are intended for preliminary engineering work. Always verify critical designs with qualified review and applicable standards before production use.
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