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Request A ToolBasic Tapping Feed Calculator
Convert spindle RPM and thread pitch into synchronized tapping feed. The relationship follows the thread lead for a conventional single-start thread. Check the machine cycle and tap supplier instructions before using the value.
Used For
Check spindle RPM and single-start pitch or threads per inch.
Formula
Metric single-start feed = RPM × pitch in mm. Imperial single-start feed = RPM ÷ TPI.
Tapping Feed Basic
Enter the values you know. The result is calculated in your browser.
Calculation only. Verify toolmaker data, material grade, engagement, machine limits, workholding and actual cutting conditions before production.
Advanced Tapping Feed Calculator
Review the additional variables shown in this tool.
Tapping Feed
Enter the values you know. The result is calculated in your browser.
Calculation only. Verify toolmaker data, material grade, engagement, machine limits, workholding and actual cutting conditions before production.
Convert Pitch And Rotation To Feed
- Select Metric for pitch in mm or Imperial for threads per inch.
- Enter actual RPM and thread value in the basic panel.
- For the advanced panel, enter cutting speed, tap diameter and a spindle ceiling. It calculates RPM and synchronized feed for the single-start relationship.
Formula And Units
Metric single-start feed = RPM × pitch in mm. Imperial single-start feed = RPM ÷ TPI.
Illustrative Calculation
At 500 RPM with a 1.5 mm pitch, synchronized feed is 750 mm/min. At 500 RPM and 20 TPI, feed is 25 in/min. TPI is threads per inch, not an inch value for pitch.
Confirm Pitch Or Lead
For a multi-start thread, lead differs from pitch. The basic pitch equation must not be applied silently to that case. Check the specified thread geometry and the conventions expected by the control.
Synchronization Is A Control Function
The calculator supplies arithmetic. It does not establish that a machine supports rigid tapping, choose holder compensation or define reversal settings. Changing spindle speed during a tapping cycle requires the correct synchronized machine behaviour.
Check the formula reference or report a result that does not match your calculation.
Calculation Process With Example Values
Illustrative arithmetic only. Select cutting inputs from the applicable tool and material reference.
| Step | Substitution | Result |
|---|---|---|
| Single-Start Feed | 500 × 1.5 | 750 mm/min |
Confirm Single-Start Thread Geometry
These panels use pitch as lead for a conventional single-start thread. Multiple starts require a separate lead calculation, and the machine cycle must support the intended motion. The tapping workspace covers thread inputs and cycle checks without selecting hole size or tap style.
Applications And Related Calculation Workflows
Tap Speed, Pitch And Feed Rate
A tap speed and feed calculation connects spindle rotation to thread lead. For a conventional single-start metric thread, lead equals pitch, so RPM × pitch gives feed in millimetres per minute. In imperial mode, the tool uses threads per inch to obtain feed per revolution. The feed rate calculator for tapping therefore follows thread geometry rather than milling tooth feed.
Check Pitch Before Synchronized Feed
Confirm whether the source gives pitch, TPI or lead before entering a number. A multi-start thread has lead equal to pitch multiplied by the number of starts; this tool expects the conventional single-start relationship. Check the machine tapping cycle and feed-mode requirements against its documentation. The tapping reference provides supporting context without replacing the control instructions.
Pitch And Feed Questions
Does Imperial Mode Accept Pitch In Inches?
The displayed imperial field expects TPI (threads per inch). It calculates lead as 1 ÷ TPI. Do not enter an inch pitch into that field.
Does The Advanced Tapping Panel Use Capped RPM For Feed?
Yes. It applies the entered spindle ceiling before calculating synchronized tapping feed. Confirm the resulting values against the supported machine cycle.
Help Improve This Resource
Report An Error
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