Custom CNC Machining Service

Precision Metal and Plastic Parts Made to Your Drawings

YS Precision provides custom CNC machining services for prototypes, low-volume production, and repeat orders. We manufacture non-standard metal and plastic parts according to customer-supplied 2D drawings, 3D models, material specifications, and functional requirements.

Our capabilities include CNC milling, CNC turning, turn-mill machining, and multi-axis CNC machining. We also coordinate material sourcing, surface finishing, dimensional inspection, trial assembly, protective packaging, and international shipment.

For overseas customers—including R&D teams and purchasing departments—this creates a more efficient and manageable manufacturing process. They can work with one team throughout machining, finishing, inspection, packaging, and delivery.

Engineering Review Before Machining

A 3D model defines the shape of a component, but it does not always explain how the part should function, fit with other components, or be inspected.

Before production, our technical team reviews the geometry, drawing notes, material, tolerances, surface finish, and intended application. We pay particular attention to:

• Critical dimensions and mating features
• Precision holes and bearing seats
• Features located across different faces
• Thin walls and areas at risk of deformation
• Deep cavities and restricted tool access
• Threads and precision surfaces
• Coating allowance and masking areas
• Practical inspection methods

This review is particularly important for complex custom CNC parts. A component may appear straightforward in a CAD model but still require careful planning because of deep pockets, multiple setups, long-reach tooling, thin sections, or limited clamping areas.

If we identify an unclear dimension, a difficult-to-inspect feature, or a possible conflict between machining and surface finishing, we discuss it with the customer before production. Resolving these points early helps reduce revisions, rejected parts, and assembly problems.

Custom CNC Milling

Our custom CNC milling service supports housings, frames, mounting plates, fixtures, brackets, manifolds, equipment bases, and other precision components.

Depending on the part geometry, we use 3-axis, 4-axis, or 5-axis CNC machining to produce features across multiple surfaces. Multi-axis machining is particularly suitable for components with angled holes, complex contours, deep profiles, or closely related features on several faces.

Typical features include precision bores, locating holes, pockets, slots, threads, angled surfaces, curved profiles, and thin-wall structures.

For complex parts, accuracy depends on more than the tolerance of an individual dimension. Datum selection, workholding, machining sequence, tool access, and the relationship between features all influence whether the finished component will assemble and function correctly.

CNC Turning and Turn-Mill Machining

YS Precision also manufactures custom CNC turned parts such as shafts, bushings, sleeves, pins, spacers, threaded fittings, and connectors.

When a turned component also includes milled flats, cross holes, slots, or off-center features, turn-mill machining can combine turning and milling in one coordinated process. This helps maintain the relationship between turned diameters and milled features while reducing unnecessary part transfers.

The manufacturing method is selected according to the component’s size, geometry, material, tolerances, and order quantity. We support both prototype quantities and repeat production of precision CNC turned parts.

Metals and Engineering Plastics

We machine a range of materials commonly used in precision mechanical applications.

Material behavior is considered when planning each machining process.

Thin aluminum parts may deform if they are clamped too heavily or machined in the wrong sequence. Stainless steel requires appropriate cutting parameters to manage heat and tool wear. Engineering plastics require attention to internal stress, heat generation, burrs, and dimensional movement.

For expensive materials such as PEEK, PEI, or titanium, we review stock preparation, workholding, and machining sequence carefully to reduce unnecessary material loss.

Precision and Tolerance Control

Our general CNC machining capability can commonly achieve tolerances around ±0.01 mm. Selected critical features may be controlled to ±0.005 mm when the geometry, material, part size, machining conditions, and measurement method allow.

However, applying extremely tight tolerances across an entire drawing can increase machining and inspection costs without improving the performance of the part.

We recommend clearly identifying dimensions that affect:

• Assembly and alignment
• Hole, shaft, and bearing fits
• Mechanical movement
• Sealing surfaces
• Flatness and parallelism
• Optical or mechanical positioning
• Interchangeability between batches

These functional requirements are considered when planning workholding, tooling, machining sequence, and inspection.

From CNC Prototypes to Repeat Production

Many custom parts change between the first prototype and final production.

Initial CNC machined prototypes may be used to evaluate fit, movement, appearance, strength, or assembly. Testing may reveal that a hole position, wall thickness, clearance, surface finish, or tolerance needs adjustment.

YS Precision supports the project through drawing review, prototype machining, customer testing, design revisions, low-volume production, and repeat orders.

The manufacturing experience gained during prototyping can then be carried into later production. Proven workholding methods, machining sequences, inspection points, and finishing requirements do not have to be developed again when the order quantity increases.

For projects involving several mating components, we can manufacture the related parts together and perform fit or trial-assembly checks before shipment when the required components are available.

Surface Finishing and Secondary Operations

Custom CNC machined parts can be supplied unfinished or with coordinated secondary processing, including:

• Clear, black, colored, and hard-coat anodizing
• Fine bead blasting
• Polishing
• Powder coating and wet painting
• Passivation
• Chemical conversion coating
• Zinc plating and other metal plating
• Laser marking and screen printing
• Knurling, tapping, and thread finishing

Surface treatment is considered during machining preparation. Precision bores, threaded holes, electrical contact areas, and mating surfaces may require masking or dimensional compensation for coating thickness.

For appearance-sensitive housings and visible components, we also consider tool marks, blasting consistency, color requirements, handling protection, and packaging. Parts can be separated or packed with protective materials to reduce scratches during transportation.

Inspection Throughout Production

Quality control begins by confirming the drawing revision, material, and technical requirements. It continues through machining, surface finishing, final inspection, and packing.

Depending on the project, our inspection process can include:

• Incoming material verification
• First-piece dimensional inspection
• In-process checks
• Thread and gauge inspection
• Surface and cosmetic inspection
• Final inspection before shipment
• Inspection reports when required
• Fit checks for mating components

For repeat orders, approved drawings and key manufacturing information are maintained to support consistency between production batches.

Industries We Support

Our custom CNC machining services support parts used in:

• Automation equipment and production fixtures
• Robotics and motion-control systems
• Medical and diagnostic equipment
• Aerospace applications
• Semiconductor equipment
• Optical and laboratory instruments
• Consumer and industrial electronics
• Communication equipment
• Automotive and transportation systems
• Marine and general industrial machinery

Manufacturing priorities vary by application. An automation fixture may depend on flatness and hole position. A robotic component may require complex multi-face machining and accurate mating features. An electronic housing may combine functional tolerances with strict cosmetic requirements. Semiconductor and optical equipment parts may depend on precise feature relationships and careful handling.

We develop the machining approach around the function of each component rather than applying the same production method to every project.

Custom CNC Machining for Overseas Customers

YS Precision supports overseas customers looking for a CNC machining supplier in China capable of managing prototypes, low-volume parts, and repeat production.

Our sales and technical teams coordinate drawing review, production communication, machining, surface finishing, inspection, packaging, and export arrangements. Customers have a consistent point of contact throughout the project, including projects involving multiple custom components or manufacturing processes.

For an accurate quotation and technical review, please provide:

• 3D CAD files in STEP, STP, IGES, or another common format
• Dimensioned 2D drawings
• Material specification
• Required quantity
• Surface-finish requirements
• Critical tolerances
• Application or assembly information
• Inspection requirements
• Delivery destination

If some specifications are still under development, we can review the available files and identify the details that should be confirmed before manufacturing.

From the first CNC prototype to stable repeat production, YS Precision provides a coordinated custom CNC machining service focused on manufacturability, dimensional control, finishing quality, and clear project communication.