CNC Machining Services
Home Capabilities CNC Machining Services for Investment Cast Parts
CNC Machining Services for Investment Cast Parts
Zeren provides CNC machining services for investment cast parts that require accurate dimensions, machined sealing surfaces, threaded holes, precision bores, mounting faces, and assembly-ready features.

By combining silica sol investment casting with in-house machining support, we help customers reduce secondary processing work, improve part consistency, and receive finished or semi-finished cast components ready for assembly.
In-house CNC machining for investment cast stainless steel parts
Why CNC Machining Matters After Investment Casting


Investment casting can produce complex near-net-shape components, but many industrial parts still require CNC machining for critical functional areas. Sealing faces, bearing seats, bores, threaded holes, flange surfaces, and assembly references often need controlled dimensions and surface quality after casting.


At Zeren, machining requirements are reviewed together with casting structure, material selection, tooling, and finishing needs, helping customers receive parts that better match their drawings and application requirements.

Machined bores sealing faces and threaded holes on investment cast parts
Critical Dimensions
Machining helps control important dimensions such as bores, slots, grooves, reference surfaces, and mounting positions that cannot rely only on as-cast tolerances.
Sealing & Contact Surfaces
Valve bodies, pump parts, covers, and flanges often require machined sealing faces or flat contact surfaces to support assembly and performance.
Threads & Assembly Features
Threaded holes, tapped holes, counterbores, and fastening features are commonly machined after casting to meet assembly requirements.
Finished Part Supply
By combining casting, machining, inspection, and finishing, we can supply semi-finished or finished cast components instead of raw castings only.
CNC Machining Capabilities We Provide


Our machining services are designed to support cast parts that require additional dimensional accuracy, functional surfaces, and assembly-ready features. Depending on the part geometry and drawing requirements, we provide turning, milling, drilling, tapping, boring, EDM, wire cutting, and manual adjustment support.

CNC Turning
CNC turned investment cast parts with machined bores and faces
Used for round or rotational cast features such as shafts, sleeves, bushings, nozzles, connectors, and circular sealing areas.
Suitable for:
Diameters, grooves, end faces, bores, and rotational surfaces.
CNC Milling
CNC milled investment cast part with pockets slots and threaded holes
Used for flat faces, slots, pockets, steps, and mounting areas on valve bodies, brackets, pump parts, and machinery castings.
Suitable for:
Flatness, slots, grooves, mounting faces, and multi-surface machining.
Drilling, Tapping & Boring
Investment cast parts with drilled tapped and bored machined holes
Used for threaded holes, bolt holes, counterbores, precision bores, and internal diameters that require accurate positioning.
Suitable for:
Threads, pin holes, bearing seats, connection holes, and internal machining.
Wire Cutting / Wire EDM
Investment cast parts with precision wire EDM slots and cut profiles
Used for narrow slots, fine profiles, sharp internal corners, and complex cut features that require controlled accuracy.
Suitable for:
Fine cuts, narrow grooves, complex profiles, and precision cut edges.
Manual Adjustment & Finishing Support
Investment cast parts with deburred edges and manual finishing details
Used for deburring, fitting, local polishing, minor correction, and final adjustment after casting or CNC machining.
Suitable for:
Edge cleanup, assembly fit, prototype adjustment, and local surface refinement.
Typical Machined Features on Investment Cast Parts


Many cast components require machining only on selected functional areas rather than the entire surface. We help identify which areas can remain as-cast and which areas require CNC machining based on drawings, assembly requirements, tolerances, and application conditions.

Machined Sealing Faces
CNC machined sealing surface on investment cast valve body
Flat and smooth sealing areas for valve bodies, pump covers, flanges, and fluid control components.
Mounting Faces & Flat Pads
Machined mounting faces on a precision cast metal component
Machined mounting faces and flat pads help cast parts sit accurately against mating components during assembly.
Precision Bores & Bearing Seats
Precision CNC machined bore and bearing seat on cast component
Precision bores, bearing seats, and internal diameters are machined to support accurate rotation, alignment, or assembly fit.
Drilled & Tapped Holes
CNC drilled and tapped holes on an investment cast metal part
Drilled and tapped holes provide accurate fastening points for bolts, screws, covers, and assembled components.
Grooves, Slots & Keyways
CNC machined grooves slots and keyways on cast metal part
Machined grooves, slots, and keyways support positioning, locking, fluid paths, or mechanical transmission requirements.
Turned Diameters
CNC turned diameters on an investment cast metal part
Turned diameters are machined on cast parts to support accurate shaft fit, concentric assembly, and round connection features.
Materials We Commonly Machine After Casting


Different casting materials have different machining behavior, surface finish expectations, tool wear conditions, and application requirements. Our team reviews both casting and machining needs before production to help customers choose suitable materials and processing routes.

Machined stainless steel duplex stainless steel and carbon steel cast parts
Stainless Steel
Commonly used for valve bodies, pump components, fittings, food machinery parts, and corrosion-resistant industrial castings requiring clean machined surfaces.
Duplex Stainless Steel
Used for marine, petrochemical, pump, valve, and corrosive-service components where both strength and corrosion resistance are important.
Carbon Steel
Suitable for structural machinery components, brackets, housings, and industrial cast parts where machining, strength, and cost balance are important.
Alloy Steel
Used for high-strength, wear-resistant, or load-bearing components that may require heat treatment and precision machining after casting.
Industries Supported by Our Casting and Machining Services


Our CNC machining services support industrial cast parts where dimensional accuracy, sealing performance, assembly fit, and repeatable quality are required. We commonly machine investment cast components for pump and valve systems, industrial machinery, petrochemical equipment, marine applications, and other engineering projects.

Machined investment cast parts for pump valve machinery marine and petrochemical applications

Pump & Valve

Machined valve bodies, pump covers, impellers, elbows, fittings, flanges, sealing faces, bores, and threaded connection areas for fluid control systems.
Industrial Machinery
Machined brackets, housings, arms, supports, connectors, and wear-related components for equipment manufacturing and machinery assemblies.
Petrochemical & Marine
Machined stainless steel and duplex stainless steel castings for corrosive environments, including pump parts, valve components, pipe fittings, covers, and marine hardware.
Custom Industrial Projects
For parts outside standard categories, our team can review drawings, samples, materials, tolerances, and machining areas to evaluate a suitable casting and machining route.
Quality Control for Machined Castings


For machined cast parts, quality control must cover both casting quality and machining accuracy. Zeren checks key dimensions, machined surfaces, threads, bores, and drawing requirements according to the part structure and customer specifications.

Quality inspection of CNC machined investment cast parts
Drawing-Based Inspection
Machining areas are checked according to customer drawings, including key dimensions, hole positions, tolerances, and functional surfaces.
Dimensional Measurement
Calipers, gauges, height gauges, and other inspection tools are used to verify machined dimensions and repeatability.
Thread & Hole Inspection
Threaded holes, tapped holes, bores, and connection features can be checked with suitable gauges or inspection methods.
Surface Roughness Review
Machined sealing faces, contact surfaces, and functional areas can be reviewed for surface finish requirements when specified.
Sample Confirmation
For new projects, sample parts can be produced and confirmed before batch production to reduce risk and improve consistency.
From Casting to Finished Machined Parts


A successful machined casting project starts before machining begins. Our team reviews part geometry, material, casting feasibility, machining allowance, tooling needs, tolerance areas, and finishing requirements to support a more reliable production process.

Workflow from investment casting to CNC machined finished parts
Drawing or Sample Review
We review drawings, 3D files, samples, or technical requirements to understand casting structure, machining areas, and functional surfaces.
Casting Process Evaluation
The part is evaluated for investment casting feasibility, wall thickness, shrinkage, machining allowance, and potential quality risks.
Tooling or 3D Printing Support
Tooling, wax injection dies, or 3D printed samples can be considered depending on project stage, quantity, and validation needs.
Investment Casting Production
Silica sol investment casting is used to produce near-net-shape metal components with complex geometry and good surface quality.
CNC Machining
Functional areas such as bores, sealing faces, threads, mounting surfaces, and reference areas are machined according to drawing requirements.
Surface Finishing & Final Inspection
Parts can be further finished, inspected, packed, and supplied as semi-finished or finished components.
Related Manufacturing Capabilities


CNC machining is often part of a broader manufacturing workflow. Depending on your project, Zeren can also support tooling, 3D printing, heat treatment, surface finishing, material selection, and quality inspection for custom investment cast components.

Investment Casting
For producing complex near-net-shape metal components before CNC machining and finishing.
Tooling & 3D Printing
For tooling preparation, sample validation, design review, and early-stage project support.
Heat Treatment
For improving strength, hardness, wear resistance, or mechanical properties when required by material and application.
Surface Finishing
For improving appearance, corrosion resistance, surface cleanliness, or final part protection after machining.
FAQ About CNC Machining for Investment Cast Parts
Q1: Can you provide CNC machining after investment casting?

Yes. Zeren provides CNC machining support for investment cast parts, including machining of sealing faces, bores, threaded holes, mounting surfaces, grooves, slots, and other functional areas based on drawings or samples.
Q2: Can you supply finished parts instead of raw castings?

Yes. Depending on project requirements, we can supply raw castings, semi-finished machined castings, or finished components with machining, surface finishing, inspection, and packing support.
Q3: What machining features can you produce on cast parts?

Common machined features include precision bores, tapped holes, threaded connections, flange faces, sealing surfaces, mounting pads, grooves, slots, and assembly reference surfaces.
Q4: Can you machine stainless steel and duplex stainless steel castings?

Yes. We commonly support machining for stainless steel, duplex stainless steel, carbon steel, and alloy steel castings. The machining process will be reviewed according to material grade, structure, tolerance, and application.
Q5: Do I need to provide 2D drawings?


2D drawings are recommended for confirming tolerances, surface roughness, threaded holes, and inspection requirements. If only samples or 3D files are available, our team can still review the project and discuss the next steps.
Q6: Can you help decide which areas need machining?


Yes. We can review the casting structure and application requirements to suggest which areas can remain as-cast and which areas should be CNC machined for assembly or performance.
Need CNC Machined Investment Cast Parts?
Send us your drawings, 3D files, samples, or machining requirements. Our team can review the casting structure, material, machining areas, tolerance requirements, surface finishing needs, and inspection standards before quotation.

Whether you need raw castings, semi-finished machined parts, or finished components ready for assembly, Zeren can help evaluate a suitable production route for your project.
CNC machined investment cast parts with drawings for quotation review
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Why Choose Zeren for CNC Machined Investment Cast Parts?

Zeren supports custom investment cast parts with CNC machining, surface finishing, inspection, and assembly-ready supply. Send us your drawings, 3D files, samples, or machining requirements, and our team will review the casting structure, machining areas, material, tolerances, and finishing needs before quotation.


·  Silica sol investment casting with in-house machining support


· CNC turning, milling, drilling, tapping, boring, wire cutting, and manual adjustment


· Support for machined sealing faces, bores, threads, mounting surfaces, and assembly features


· Material review for stainless steel, duplex stainless steel, carbon steel, and alloy steel


· Drawing-based inspection before deliverySilica sol investment casting with in-house machining support

Send Us Your CNC Machining Requirements
If you have any needs or questions, feel free to contact us through the form, and we will respond you within 6 hours.
Request a Quote
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