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Custom rotational components

CNC Turning Services for Custom Rotational Parts

CNC turning for custom parts whose function depends on controlled diameters, bores, shoulders, grooves, filets, faces, and related features.

Request a CNC Turning QuoteReview Turning Capabilities
Review focus

Follow the axis through the complete part

We evaluate the machining route around the features that matter to the accepted component.

FitMating diameters and interfaces
MotionRelated rotating and sliding features
SealingFaces, grooves, and surface condition
AlignmentDatum axes, shoulders, and runout
AssemblyFinal condition and acceptance

CNC Turning Capabilities by Rotational Feature

CNC turning is commonly used when the primary geometry is arranged around a rotational axis. The useful review starts with the relationships the finished component must maintain.

External Diameters, Faces, and Shoulders

External turning can produce straight and stepped diameters, while facing establishes end surfaces used for length control, locating, l'étanchéité, or assembly. Shoulders may locate bearings, seals, spacers, retaining components, or mating parts.

  • Critical outside diameters
  • Bearing, sliding, or sealing surfaces
  • Locating faces and shoulders
  • Reliefs, undercuts, chamfers, and radii
  • Edge, burr, and functional surface requirements

A diameter and a face can each meet their individual size requirements while their relationship still affects the final assembly. Define critical relationships through the drawing.

Bores and Internal Features

Turned components can include through bores, blind bores, internal shoulders, recesses, counterbores, and internal threads where geometry and tool access allow.

Include bore diameter and depth, bottom condition, thread requirements, entry condition, and the relationship between internal and external features. Where an inside diameter must remain related to an outside diameter, identify the datum structure and geometric requirement.

Grooves, Threads, and Edge Requirements

Grooves can serve seals, retaining rings, clips, lubrication features, or assembly functions. Threads may be internal or external and can interact with shoulders, reliefs, sealing faces, and finishing allowances.

Specify the thread requirement, l'ajustement, relief, entry or runout condition, and any mating or gauging requirement. Define part-off faces, controlled edge breaks, chamfers, sharp-edge restrictions, and deburring where they affect the finished component.

Common CNC Turned Parts

These categories provide a fast starting point. The complete drawing still determines the process, support, finishing, and inspection route.

Shafts

Stepped diameters, bearing seats, shoulders, grooves, filets, and locating faces often work as one connected system.

Sleeves

Bore-to-OD relationships, wall thickness, end faces, and surface condition can control assembly and inspection.

Bushings

Inside and outside diameters can combine with shoulders, flanges, grooves, or lubrication-related features.

Pins

Stepped diameters, chamfers, grooves, filets, cross-holes, and retaining features belong in the complete RFQ.

Spacers and Collars

Length, face condition, bore size, outside diameter, parallel locating surfaces, and finish may work together.

Threaded and Custom Parts

Threads can combine with shoulders, grooves, sealing surfaces, recesses, flats, trous, and secondary features.

Functional relationships

Control Critical Rotational Relationships

A diameter can meet its size requirement while the complete rotational relationship still fails the needs of the assembly.
Datum structure

Establish the Functional Datums

A bearing diameter may locate from a shoulder. A sealing surface may need to remain related to a bore. A threaded section may position a mating component against an end face.

Identify the datum axis and datum faces that control fit, le mouvement, l'étanchéité, l'alignement, or assembly. This gives machining and inspection planning a clear priority.

Acceptance logic

Define Runout and Fit Where Needed

Runout requirements should identify the controlled feature and the datum from which it is evaluated. Size, form, orientation, location, and runout describe different characteristics.

For mating diameters, identify the required fit, clearance, or interface condition. State whether controlled features are accepted before or after treatment when the process can affect the measured condition.

Choose the Machining Route Around the Complete Part

Primary evaluation route

Tournage CNC

Predominantly rotational geometry is a strong indication that CNC turning should be evaluated first. The complete feature layout, matériau, quantité, finishing, support, and inspection requirements determine the manufacturing route.

A turned component may also require flats, cross-holes, keyways, milled slots, intersecting bores, angled features, or other off-axis geometry. Include them in the initial quotation so the complete component can be reviewed together.

Faces, poches, hole patterns, fentes, and profilesFraisage CNCComplex angled, multi-face, contoured, or off-axis relationships5-Usinage d'axe
Suitable small or slender rotational componentsTournage SuisseURL pending confirmation

For broader process selection, compare CNC machining processes.

Plan for Slender, Thin-Walled, and Secondary Features

Support condition

Slender and Thin-Walled Geometry

Long slender sections, thin walls, extended bores, and major diameter transitions can make a component more sensitive to support, clamping, material removal, and measurement condition.

Identify the features that control function and state where important dimensions depend on a free-state, fixtured, or assembled condition. Support and sequence are evaluated around the actual material and geometry.

Complete feature set

Cross-Holes, Flats, Slots, and Keyways

Off-axis features can affect machining sequence, transfers, burr formation, handling, and inspection access. Show their position and orientation relative to the primary turned datums.

Identify burr restrictions, protected handling surfaces, critical edge conditions, and features that must remain unchanged. Approved design changes belong in the controlled drawing or model.

Materials for CNC Turned Parts

GPT Precision machines commonly specified metals and engineering plastics. Specific grades, supplied conditions, certifications, and suitability are reviewed for each project.

Métaux

AluminiumStainless steelCarbon steelLaitonCuivreBronzeTitane

Engineering Plastics

POM / AcetalNylonPolycarbonateABSPTFEPMMA / Acrylique

Material behavior can influence chip control, support, dimensional stability, surface condition, and inspection. Identify functional dimensions that may be sensitive to support or measurement conditions.

Surface Finishing and Final Condition

Surface roughness, visual appearance, and surface treatment are separate requirements. Define the finished condition around the component's function.

Functional Surfaces

Distinguish bearing seats, sliding diameters, sealing surfaces, filets, electrical contact areas, and datum faces from cosmetic areas.

Treatment Requirements

Include the finish or treatment specification, masking, coating condition, color or texture, and any certification or evidence requirement.

Final Acceptance

State whether controlled features are accepted before or after heat treatment, plaquage, anodizing, or another operation that may affect dimensions and surfaces.

Options can include anodizing, hard anodizing, chemical conversion coating, bead or sand blasting, polissage, brushing, passivation, plaquage, powder coating, painting, and heat treatment. Availability and compatibility are reviewed by project.

Inspection for CNC Turned Parts

Inspection planning follows the functional relationships that drive the machining plan.

ISO 9001:2015 Certified

GPT Precision is ISO 9001:2015 certifié.

Match the Method to the Feature

Methods can include CMM, optical measurement, dimensional gauges, inspection fixtures, and fit and function gauges.

CMMOptical measurementDimensional gaugesInspection fixturesFit and function gauges

Reporting is reviewed during quotation. Identify dimensional reports, FAI, CPK, PPAP, SPC, lot control, sampling, or other record requirements before ordering.

Examiner les exigences de qualité

Why GPT Precision for CNC Turning

Project-Specific Process Review

Geometry, matériau, critical interfaces, secondary features, finishing, and inspection requirements are reviewed together.

Multi-Process Coordination

Tournage, milling, off-axis features, treatment, finishing, and other secondary operations can be reviewed within the overall route.

Inspection Around Critical Features

Inspection requirements are considered around the datums, interfaces, relationships, and acceptance criteria defined for the project.

ISO 9001:2015 Certified

Project quality requirements are reviewed against the drawing and agreed acceptance criteria.

What to Include in a CNC Turning RFQ

A complete RFQ makes manufacturing scope and acceptance requirements easier to review and compare.

Drawing and 3D Model

Provide the current 2D drawing and 3D model with matching revision identifiers.

Material and Quantity

Include grade, condition, certification, substitution limits, quantité, recurring volume, and target schedule.

Critical Dimensions and Datums

Identify the datum axis, datum faces, critical diameters, bores, shoulders, grooves, filets, runout, and important surfaces.

Secondary Features

Show cross-holes, flats, keyways, fentes, intersecting features, burr restrictions, and protected handling surfaces.

Finishing and Final Condition

Specify treatment, coating, masking, roughness, cosmetic requirements, and when controlled dimensions apply.

Inspection and Acceptance

Identify required inspection methods, reporting scope, sampling requirements, and final acceptance conditions.

Include assembly or mating-part information when it clarifies fit, le mouvement, l'étanchéité, l'alignement, or another critical interface.

Maximum size, production capacity, and lead time are evaluated from the drawing, matériau, du processus, Maintien de la pièce, equipment fit, quantité, et exigences du projet.

What types of parts are suitable for CNC turning?

CNC turning is commonly evaluated for parts whose dominant geometry is arranged around an axis, including shafts, manchons, goupilles, bagues, spacers, threaded components, and parts with controlled diameters, bores, shoulders, grooves, filets, and faces.

Final suitability also depends on material, support requirements, secondary features, quantité, finishing, and inspection requirements.

How do I choose between CNC turning and CNC milling?

Start with the dominant geometry. Features arranged around a common axis, such as related diameters, bores, shoulders, grooves, and rotational threads, normally point toward a turning evaluation.

Parts dominated by faces, poches, hole patterns, fentes, and profiles generally point toward CNC milling. Mixed geometry may require secondary machining or a combined manufacturing route.

Can CNC turned parts include flats, cross-holes, or milled slots?

Oui. Off-axis features can be included in the overall process review, but they may affect machining sequence, setup, equipment selection, transfers, burr control, and inspection.

Show their position and orientation relative to the primary turned datums and quote the complete finished component.

When should a part be evaluated for Swiss turning?

Swiss turning can be considered for suitable small or slender rotational components.

Size alone does not determine suitability. Complete geometry, matériau, support requirements, secondary features, quantité, Relations de tolérance, and inspection requirements should be reviewed together.

What files should I send for a CNC turning quote?

Send the current 2D drawing and 3D model where available, with matching revision information. Also include material, quantité, dimensions critiques, datum requirements, secondary features, finishing, inspection, and target schedule.

Assembly or mating-part information can also clarify important functional interfaces.

Can inspection reports be provided for CNC turned parts?

Inspection documentation is reviewed according to the drawing, RFQ, and agreed acceptance requirements.

If the project requires a dimensional report, first article inspection, CPK, PPAP, SPC, lot control, specific sampling, or another record, include it in the RFQ so scope and applicability can be evaluated before quotation and production.

Project review

Request a CNC Turning Quote

Send the current drawing and 3D model with material, quantité, schedule, caractéristiques critiques, datums, finishing, and inspection criteria.

Request a CNC Turning Quote