Stainless Steel Flanged Hub for Resonance Damper Shaft Assembly

Precision CNC Turning of a 316L Flanged Hub

The component combines two different cylindrical diameters within a single machined structure.

The wide flange provides a circular mounting interface, while the raised hub contains the central opening and radial threaded features.

Unlike a simple spacer, the part requires multiple machining operations to establish its outer profile, stepped bore, and accurately positioned holes.

Controlling the Flange and Hub Geometry

The engineering drawing specifies a flange diameter of Ø1.750″ and an overall length of 0.790″.

The raised cylindrical section has a nominal diameter of Ø0.750″ with an asymmetric tolerance of +0.0003″/−0.0011″.

For similar components, maintaining a consistent relationship between the flange and hub is important for correct assembly.

A suitable CNC turning strategy should consider:

• Consistent flange and hub diameters
• Controlled shoulder transitions
• Alignment of cylindrical features
• Face geometry and finished thickness
• Stable workholding during turning

Karry Precision's CNC turning services support components with stepped profiles, controlled diameters, and custom assembly features.

Precision Machining of the Stepped Central Bore

One of the most demanding features is the stepped central opening.

The drawing identifies two nominal bore diameters:

• Ø0.450″ for one section of the internal profile
• Ø0.500″ with a tolerance of +0.0005″/−0.0000″ for the precision section

The second requirement creates a narrow allowable diameter range and requires an appropriate finishing and inspection strategy.

For 316L stainless steel, careful cutting-tool selection is important because the material can work-harden during machining.

The bore machining plan should consider finishing allowances, cutting conditions, and tool wear.

The intended bore fit and functional requirements must follow the approved assembly drawing.

Three-Hole Flange Pattern and Radial Threading

The hub includes additional holes that require machining from different directions.

These features distinguish the project from a conventional CNC turned cylindrical part.

Three Equally Spaced Face Holes

The circular flange contains three small holes positioned at 120° intervals.

According to the drawing, each hole has a nominal diameter of Ø0.089″ and a depth of 0.125″, with an associated Ø0.109″ × 90° entrance feature.

The hole centers lie on a nominal radius of 0.463″ from the component center.

Machining these features requires attention to angular indexing, drilling depth, and the relationship between the hole pattern and the central bore.

Radial 6-32 UNC Threaded Holes

The raised hub includes two radial holes specified as 6-32 UNC through threads.

These are different from the three smaller holes on the flange face.

For similar components, radial threading involves positioning the cylindrical workpiece, drilling from the sidewall, and producing the required thread geometry.

Important manufacturing considerations include thread alignment, engagement with the mating fastener, and removing burrs where the radial holes intersect the internal bore.

Appropriate thread gauges should be selected according to the complete drawing requirements.

Why Use AISI 316L Stainless Steel?

316L stainless steel provides good corrosion resistance, including improved resistance to certain chloride-containing environments compared with standard 304 stainless steel.

It is commonly used for engineered components that require corrosion resistance and suitable mechanical properties.

For this flanged hub, 316L also introduces machining considerations.

Its tendency to work-harden requires controlled cutting conditions, appropriate tools, and attention to heat generation.

The material's suitability for the actual resonance damper assembly depends on its mechanical loading, environmental conditions, and the complete equipment design.

Detailed Technical Specifications

The dimensional values are engineering drawing requirements, not independently verified measurements. Specific dimensional callouts take precedence over general tolerances.

Quality Control for Precision Machined Flanged Hubs

Dimensional inspection is especially important when a component combines tight bore tolerances, a circular hole pattern, and radial threaded features.

The inspection plan should distinguish between general dimensions and the individual precision requirements identified on the drawing.

Depending on the relevant tolerances, suitable inspection equipment may include bore gauges, micrometers, height gauges, coordinate measuring machines, and thread gauges.

Where concentricity or runout requirements apply, their acceptance criteria must be established from the complete approved drawing.

Karry Precision provides additional information on its tolerance and quality control capabilities.

Application in a Resonance Damper Shaft Assembly

The customer drawing identifies the component as a Resonance Damper Shaft.

The flange, central bore, and radial threads provide several possible mechanical interfaces within the assembly.

For similar components, the flange may serve as a mounting surface, while the central bore and radial threaded holes may interact with a mating shaft or fastening elements.

The exact function of these features must be confirmed from the complete assembly design.

The supplied documentation does not provide operational vibration measurements, rotational speed ratings, or verified damping performance.

Therefore, this case focuses on the component's manufacturing requirements rather than claiming specific system performance.

Frequently Asked Questions

What is a stainless steel flanged hub?

A stainless steel flanged hub is a circular mechanical component combining a flange with a raised cylindrical section. Depending on its design, it may include central bores, mounting holes, and threaded features for assembly.

Why is 316L stainless steel used for this component?

316L stainless steel offers good corrosion resistance and useful mechanical properties. It can be machined into precision components when suitable cutting conditions and manufacturing methods are selected.

Can CNC turning produce precision stepped bores?

Yes. CNC turning and boring operations can manufacture stepped internal profiles. Actual achievable accuracy depends on the bore size, tolerance requirements, tooling, workholding, and inspection method.

How are three equally spaced holes machined on a flange?

CNC drilling or milling equipment with suitable positioning or indexing can produce hole patterns at specified angular intervals. Hole dimensions and locations must follow the engineering drawing.

What are radial 6-32 UNC threaded holes?

They are threaded holes extending from the cylindrical side surface toward the interior of the component. A 6-32 UNC thread is an inch-series fastener thread with 32 threads per inch.

Can Karry Precision manufacture custom stainless steel flanged hubs?

Karry Precision provides custom CNC machining services for flanges, hubs, shafts, and other precision metal parts. Customers can submit engineering drawings to review material requirements, tolerances, machining feasibility, inspection needs, and quotations.