Machining Time Calculator
Cutting time for a turning pass, with spindle speed, feed rate in mm/min and material removal rate.
Results
What this tool does
Quoting a machined part starts with the cutting time, and cutting time is nothing more than the distance the tool travels divided by how fast it travels. The chain is short: cutting speed and diameter give the spindle speed, spindle speed and feed per revolution give the feed rate, and the length divided by that is the answer. Everything else in the cycle has to be added on afterwards.
Formula
n = 1000 Vc / (pi D) ; t = L passes / (f n)
Variables
| Symbol | Meaning | Unit |
|---|---|---|
dd | Diameter | mm |
vc | Cutting speed | m/min |
ff | Feed per revolution | mm |
ll | Length of cut | mm |
np | Number of passes | — |
ap | Depth of cut | mm |
TM | Cutting time | min |
TS | Cutting time | s |
RP | Rotational speed | rpm |
FR | Feed rate | mm/min |
MR | Material removal rate | cm³/min |
Worked example
- Diameter50 mm
- Cutting speed200 m/min
- Feed per revolution0.2 mm
- Length of cut120 mm
- Number of passes2
- Depth of cut2 mm
- Cutting time0.9425 min
- Cutting time56.55 s
- Rotational speed1273.2 rpm
- Feed rate254.65 mm/min
- Material removal rate80.000 cm³/min
Limitations
- The result is an estimate based only on the values you type. Real situations often include factors this calculator does not know about.
- Coverage and consumption figures vary between products. Take the values from the manufacturer's datasheet for the product you are actually using.
Frequently asked questions
Does this include approach and retract?
No. This is cutting time only, the part of the cycle where metal is actually coming off. A realistic cycle time also needs rapid moves, tool changes, dwell, part loading and any in-process gauging, and on short parts those can easily exceed the cutting time itself. Add the length of any approach and overrun to the cut length if you want them counted.