Rotary Broach Holder

Our Rotary Broach Tool Holders are precision-engineered tooling solutions for producing accurate internal hex, square, Torx®, spline, serration and custom polygonal profiles on CNC lathes, CNC turning centers, Swiss-type machines and automatic lathes.

Designed for smooth broach rotation, high rigidity and reliable broach support, our CNC Rotary Broach Holders help manufacturers produce consistent internal profiles with repeatable machining performance.

Whether you require a standard rotary broach holder or a customized solution for a specific CNC machine, broach size or component, we can provide tooling designed around your application

Key Features

·         Precision rotary broach tool holder

·         CNC lathe and turning-center compatible configurations

·         Suitable for internal hex and square broaching

·         Torx®, spline and custom polygonal profiles

·         Bearing-supported rotary broaching mechanism

·         High rigidity and controlled broach rotation

·         Reliable broach retention

·         Low-runout tooling options

·         Suitable for production machining

·         Standard and custom configurations

·  Available for different machine and tool interfaces

What Is a Rotary Broach Tool Holder?

A rotary broach tool holder is a specialized CNC tooling device used to hold and rotate a rotary broach while machining an internal polygonal profile.

During rotary broaching, the broach is supported at a slight angular offset relative to the workpiece axis. As the tool rotates, only a small portion of the cutting edge engages the material at any one time. This progressively forms the required internal profile.

Rotary broaching is commonly used to manufacture:

·         Internal hexagonal holes

·         Internal square holes

·         Torx® profiles

·         Splines

·         Serrations

·         Custom polygonal profiles

Pilot Hole for Rotary Broaching

A correctly prepared pilot hole is essential for internal rotary broaching.

The pilot hole provides clearance for the broach and reduces unnecessary cutting load. The required pilot-hole diameter depends on:

·         Internal profile size

·         Across-flats dimension

·         Broach geometry

·         Workpiece material

·         Broaching depth

·         Broach manufacturer’s specifications

As preliminary design guidelines, pilot-hole sizing may be estimated from the required profile, but the final dimension should be verified using the actual broach manufacturer’s chart.

Hexagonal Pilot Hole

For an internal hex profile, the pilot-hole size is generally selected slightly larger than the across-flats dimension.

A commonly used starting guideline is:

Pilot Hole ≈ Hex A/F × 1.03

This is only a preliminary guideline. Actual tooling recommendations should be followed for production machining.

Square Pilot Hole

For an internal square profile, a preliminary pilot-hole guideline may be:

Pilot Hole ≈ Square A/F × 1.10

The actual pilot-hole requirement depends on the broach design and application.

Rotary Broaching Depth

Broaching depth depends on the profile size, workpiece material, broach design, machine rigidity and tooling setup.

As a general starting reference, rotary broaching depths are often considered in relation to the profile’s across-flats dimension. In some applications, a depth of approximately 2 × A/F may be achievable, but this should not be treated as a universal specification.

For deeper holes, specialized tooling and application-specific calculations may be required.

Cutting Speed & Feed for Rotary Broaching

Rotary broaching parameters should be selected according to:

·         Workpiece material

·         Broach size

·         Profile geometry

·         Broaching depth

·         Pilot-hole diameter

·         Machine rigidity

·         Holder design

·         Coolant/lubrication

·         Required tool life

There is no universal RPM or feed rate for every rotary broaching application.

As a starting point, some applications may operate within approximately 400–3500 RPM with feed rates around 0.003–0.009 in/rev, but these figures are application-dependent and must be validated with the actual broach, material and machine.

For production applications, we recommend establishing cutting parameters through the broach manufacturer’s tooling data and application testing