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CNC Feeds & Speeds

Brass & Bronze Machining Reference

Brass and bronze should not share a single default feed and speed simply because both are copper alloys. Start with the specified alloy and the tool supplier entry for the actual operation.

Read The Alloy Designation

A free-machining brass reference is not automatically a reference for a bronze component. Record the designation available from the job or stock documentation. If the tooling source divides the family into subgroups, retain that distinction when recording the cutting data.

Connect The Data To The Tool

A drill chart may state feed per revolution; an end-mill chart may state feed per tooth. Preserve the unit and the tool identification. Multiplying a drill feed-per-revolution value by flute count would introduce a new value that the source did not specify.

An Illustrative Feed Convention Check

At 2,000 RPM, a chosen 0.10 mm/rev corresponds to 200 mm/min. A milling tooth feed of 0.10 mm/tooth with two effective flutes at the same RPM corresponds to 400 mm/min. The example compares units only; it does not recommend either condition for brass or bronze.

Useful Setup Notes

Keep the alloy, operation and relevant edge geometry with the calculated values. When the stock or tool changes, revisit the source data. The calculator has no field that can infer the actual alloy or automatically identify whether a cutter is appropriate.

Open The Feed & Speed Calculator | Browse Material References

Copper Alloy Designations Worth Keeping

Two useful identification examples are C36000 brass and C93200 bronze. Wieland and Aviva Metals publish supplier information for these alloy examples. Keep the specified alloy with the job record instead of treating a common copper-alloy colour or a general brass/bronze label as sufficient identification.

ExampleReference And Scope
C36000Wieland brass-alloy designations (supplier designation cross-reference).
C93200Aviva Metals C93200 bearing-bronze reference (bearing-alloy selection context).

Use Case: Turning A Bronze Bearing Component

For a component already specified in a bronze alloy, keep that designation and the relevant material documentation with the insert reference. Use the turning workspace for workpiece-diameter and feed-per-revolution calculations. The bearing-material reference does not select a cutting speed for an unspecified insert or establish that the material meets the component’s service requirements.

The examples explain material identification, not material substitution. Use the job specification and applicable supplier documentation for the actual component.

Copper Alloy Questions

Can Brass And Bronze Share The Same Default Data?

Do not assume so. Identify the specified alloy and the tool supplier category for the actual operation.

Why Do Two Identical Feed Numbers Produce Different Linear Feeds?

A value per tooth and the same value per revolution have different meanings. Milling tooth feed includes effective teeth; the per-revolution relationship does not add that multiplier.

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