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CNC Feeds & Speeds

CNC Tapping Reference

Tapping reference covering RPM, thread pitch, synchronized feed, hole preparation and rigid tapping.

Relate Rotation To Thread Lead

A conventional single-start tapping calculation connects spindle RPM with thread pitch to obtain synchronized linear feed. Metric pitch is expressed as distance per revolution; an imperial TPI value must first be interpreted as threads per inch. This is a thread relationship, not the general milling feed equation.

Check The Thread Specification

Thread size, pitch, hole depth and tap style belong in the calculation record. For a multi-start thread, lead differs from pitch, so the basic single-start equation must not be transferred silently. Confirm the intended geometry and the input convention expected by the machine cycle.

Use The Actual Machine Cycle

The arithmetic supplies a feed relationship. It does not confirm rigid-tapping capability, select holder compensation or choose spindle reversal settings. Use the machine and tap supplier instructions for the application, then keep the relevant cycle settings beside the calculated RPM and feed.

Open The Relevant Calculator | Review Formulas And Units

Use A Thread Relationship For Tapping

The tapping workspace connects pitch or TPI with RPM and synchronized feed. Its supporting time check describes one feed stroke, not the full cycle. Read the RPM/feed article to understand the quantity changes, but retain the thread lead requirement when reviewing tapping.

Primary Threading And Tapping Reference

Sandvik Coromant’s threading definitions distinguish lead, pitch and tapping feed. Use the machine and tap instructions for cycle behaviour and hole preparation. Thread milling follows a separate toolpath relationship and should not inherit a tapping feed without checking its geometry.

Tapping Reference Questions

Is Thread Pitch The Same As Lead?

For a single-start thread they are equal. A multi-start thread advances by more than one pitch per revolution, which needs a separate lead check.

Where Can I Check Synchronized Feed?

Use the tapping workspace for pitch/TPI examples and the two calculator panels. Check the machine cycle separately.

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