Reference process arithmetic
Drilling speed & time
Inputs
Nominal drill diameter used for cutting-speed arithmetic.
Constant spindle speed during the stated cut.
User-entered axial feed per spindle revolution.
Entered drilling depth only; add approach and breakthrough separately if required.
Whole number of identical holes under the same stated process condition.
Results
Peripheral cutting speed
47.124
Spindle feed rate
150
Nominal cutting time
84
Total programmed cutting depth
210
vc = πDcn/1000; vf = frn; Tc = ld·i/(frn)
A first-pass number, not a code check, certification, or approval. Read the method and its limits below. What this is and is not.
Nearby: Milling removal rate · Turning material removal · Milling cutting parameters · Sheet-metal bend development
Method
Formula, when it applies, and when it does not
Calculate cutting speed, axial feed rate, and nominal drilling time from drill geometry, spindle speed, feed per revolution, depth, and hole count.
vc = πDcn/1000; vf = frn; Tc = ld·i/(frn)
When
- Constant feed per revolution
- Cutting length equals entered depth
- Integer hole count
- Reference arithmetic only
Don’t
- This is reference machining arithmetic for constant-speed, constant-feed drilling. It excludes approach, breakthrough, retract, peck cycles, tool wear, material and coolant effects, machine acceleration, fixturing, chip evacuation, spindle limits, power, quality, and process qualification.