5 minutes is the example result. Read it using the units and relationship stated below.
CNC Tool Life uses material removed, removal rate per hour.
Keeping feed calculations attached to the cutting conditions
For cnc tool life, the relationship is Result = (([Material removed]) ÷ ([Removal rate per hour])). The amount depends on the supplied material removed, removal rate per hour, rather than a live market price or a value imported from another record. A machining relationship connects diameter, speed, feed and engagement. It does not choose a safe starting point without the cutter, material and setup. Manufacturer cutting data should provide the process assumptions used in the form.
What the model includes
Result = (([Material removed]) ÷ ([Removal rate per hour])) Keep millimetres and metres distinct, and record whether feed is per tooth, per revolution or per minute. A correct conversion can still be unsuitable when tool reach, workholding, machine limits or chip evacuation changes. Use the result as a conversion or comparison, then validate the process against the tool guidance and machine capability. This page does not replace a tested setup sheet or account for every cutting condition.
Example with the supplied inputs
Material removed: 10; Removal rate per hour: 2. Result: 5 minutes. The values are illustrative.
Compare one changed input
Material removed changes from 10 to 11. The result becomes 5.5 minutes. All other inputs remain fixed.
Calculation rule
Result = (([Material removed]) ÷ ([Removal rate per hour]))
Inputs and output
| Input | Example value | Entry convention |
|---|---|---|
| Material removed | 10 | Use the source quantity represented by material removed. Keep the counted population fixed and avoid mixing a unit value with a period total. |
| Removal rate per hour | 2 | Use the source quantity represented by removal rate per hour. Keep the counted population fixed and avoid mixing a unit value with a period total. |
Output: 5 minutes is the example result. Read it using the units and relationship stated below. Unit: minutes.
How to use the page
Collect the inputs
Gather Material removed, Removal rate per hour. Use one period and the units shown in the form.
Run the calculation
Enter the values and select the action. The calculation rule above explains how the inputs produce the result.
Compare a scenario
Change Material removed on its own, keeping the other inputs fixed. Read both results before changing another assumption.
Worked example
With the example inputs listed above, the result is 5 minutes.
Change Material removed from 10 to 11 while keeping every other value fixed. The result becomes 5.5 minutes. This comparison isolates that input; it does not forecast how other variables will respond.
Check the stated formula, units and limits before using the result in a decision.
Keep the displayed formula, input units and model scope with the result. Corrections or questions can be sent through the request section on this page.
Content updated: October 11, 2026