When to use this calculator
Estimate repeated turning-pass feed time from travel, feed and speed. Steady feed-time estimate only, excluding return, approach, tool changes and speed variation.
Explore the machining feeds, speeds & time calculators for other questions in this topic. For a related calculation, use the Turning Feed Rate Calculator: Convert a turning feed per revolution into linear travel rate.
PUTTING IT INTO PRACTICE
Turning Diameter Reduction Time: a worked example
The values below are an illustrative example, not a recommendation. Replace them with measurements or assumptions that match your question.
| Input | Example value |
|---|---|
| Cut travel per pass (mm) | 100 |
| Passes (integer) | 3 |
| Feed per revolution (mm) | 0.2 |
| Speed (rpm) | 500 |
| Result | 3 min |
- Check the input labels and enter the example values above.
- Apply the relationship: Feed time = travel × passes/(feed per rev × rpm).
- The result is 3 min, rounded for display.
How to interpret your result
Steady feed-time estimate only, excluding return, approach, tool changes and speed variation.
Choose cutting speeds and feeds from suitable tooling and material guidance. These tools translate quantities rather than selecting safe cutting conditions. Effective diameter, engagement, machine limits and setup time need separate attention.
Frequently asked questions
Does the spindle-speed calculation recommend a cutting speed?
No. You supply the cutting speed. The tool converts it and a diameter into revolutions per minute.
When is the turning diameter reduction time calculator useful?
Estimate repeated turning-pass feed time from travel, feed and speed. Steady feed-time estimate only, excluding return, approach, tool changes and speed variation.
How do I use the turning diameter reduction time calculator?
Enter cut travel per pass (mm), passes (integer), feed per revolution (mm), speed (rpm). The result updates automatically. Use the units shown beside each input; the example values illustrate the method.
Which formula does this calculator use?
Feed time = travel × passes/(feed per rev × rpm).
What should I check before using the result?
Steady feed-time estimate only, excluding return, approach, tool changes and speed variation.
How are results rounded?
Scalar numbers display up to six decimal places, with scientific notation for very large or small values. Text, fraction, date and schedule outputs use the format described on the tool. Intermediate calculations use JavaScript floating-point arithmetic. Keep sensible precision for your measurements.
Further reading
For background on this topic, see Sandvik Coromant: machining formulas and definitions ↗. This is a topic reference, not an external review or endorsement of this tool.
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