Drilling time calculator
The drill point adds depth that is easy to forget, and it matters most on thin material.
degrees
rpm
Time per hole
9.335s
- Total time
- 0:03:07
- Extra depth from the drill point
- 3.004
- Total travel per hole
- 28.004
- Feed rate
- 180.0 mm/min
- Material removal rate
- 14 137 mm3/min
- Rough thrust force
- 300
- Rough spindle power
- 0.589 kW
Show the working
- Drill diameter = 10
- Hole depth = 25
- Point angle = 118
- Spindle speed = 1200
- Feed per revolution = 0.15
- Number of holes = 20
- Extra depth from the drill point = 10 / 2 / tan(rad(118)/2) = 3.0043
- Total travel per hole = 25 + 3.0043 = 28.0043
- Feed rate = 1200 * 0.15 = 180
- Time per hole = 180 > 0 ? 28.0043 / 180 * 60 : 0 = 9.334 77
- Total time = 9.334 77 * 20 = 186.695
- Material removal rate = pi * 10^2 / 4 * 180 = 14 137.2
- Rough thrust force = 0.5 * 400 * 10 * 0.15 = 300
- Rough spindle power = 14 137.2 / 60000 * 2.5 = 0.589 049
Values are shown to six significant figures here; the arithmetic itself runs on exact fractions and is only rounded where a number is printed.
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The formula
- point depth = (diameter / 2) / tan(point angle / 2)
- time = (depth + point depth) / (rpm x feed)
A 118-degree point adds 0.3 times the diameter in depth; a 135-degree point adds 0.207 times.