Junying Metal Manufacturing Co., Ltd was founded in 2005, giving us over 20 years of experience in CNC manufacturing services. We are headquartered in Dongguan, China, with more than 100 employees and a registered capital of RMB 3 million.

Certifications and credentials include:

• ISO 9001:2015 quality management system certification (certified by SGS since 2015)

• ISO 14001 environmental management system certification (SGS review passed in 2016)

• Strict adherence to international standards in all production processes

These certifications are maintained through regular audits and reflect our commitment to consistent quality and environmental responsibility.

We are a direct manufacturer with our own factory, not a trading intermediary. Our manufacturing facility is equipped with:

• Hundreds of advanced CNC machining machines, lathes, and ancillary equipment

• Vertical, horizontal, 3-axis, 4-axis, and 5-axis CNC machining centers

• Full supporting facilities including blasters, ultrasonic washing machines, and quality inspection laboratories

• Temperature-controlled workshop areas for high-precision work

Working directly with our factory means you eliminate middleman markup, have direct communication with engineers, and enjoy faster turnaround.

We serve customers worldwide, with established shipping experience to major markets including:

• North America (United States, Canada)

• Europe (Germany, UK, France, Italy, Netherlands, etc.)

• Asia-Pacific (Japan, South Korea, Australia, Southeast Asia)

• Middle East and other regions

We are familiar with the import documentation, packaging requirements, and logistics arrangements for each region. If you let us know your destination country, we can provide a tailored shipping plan.

Yes. You can browse our Products section at cnclathing.com/products for case examples, including:

• CNC anodized aluminum milling parts

• OEM brass turned/milled components

• Polished aluminum parts for electrical equipment

• 304 stainless steel fabricated parts

• Titanium Grade 5 satin finish auto parts

• Lock cylinder machining (SFIC cores)

For testimonials specific to your industry, please contact our sales team directly. We can share relevant case studies upon request, subject to client confidentiality agreements.

Absolutely. We take intellectual property protection seriously:

• We are happy to sign a mutual NDA before you share any design files

• All CAD files and technical drawings are stored on access-controlled internal servers

• Only authorized engineering staff involved in your project have access to your files

• We can include specific IP protection clauses in our manufacturing agreement

• Upon request, we will destroy or return all design files after project completion

We understand that your designs represent significant R&D investment, and we treat them with the same care as our own proprietary information.

Our quality assurance process includes multiple inspection checkpoints designed to catch issues before shipment. In the rare event that a quality issue is discovered after delivery:

1. Document the issue: Provide photos, measurements, and a description of the non-conformance within a reasonable timeframe after receipt

2. Our quality team will review: We investigate whether the issue stems from manufacturing, material, or specification ambiguity

3. Resolution: Depending on the root cause, we will remake the affected parts, issue a credit, or provide a refund for confirmed manufacturing defects

4. Continuous improvement: Each quality incident feeds into our CAPA (Corrective and Preventive Action) system to prevent recurrence

We stand behind our workmanship. Please inspect parts upon receipt and report any issues promptly so we can resolve them quickly.

We operate a full range of CNC equipment across all axis configurations:

We recommend 5-axis machining when your part requires machining on multiple faces with tight positional tolerances between features. It reduces setups and improves accuracy.

Our standard and precision tolerance capabilities are as follows:

Yes, we can achieve ±0.01 mm for specific projects, depending on material, part geometry, and structure. We recommend only specifying extremely tight tolerances on functional or assembly-critical features to control cost. If ±0.05 mm satisfies your requirements, there is no need to design to ±0.01 mm.

Our size capabilities vary by process:

• CNC Milling: Maximum envelope approximately 1,200 mm × 800 mm × 600 mm (varies by machine type; contact us with your specific dimensions)

• CNC Turning: Maximum diameter approximately 500 mm, length up to 1,000 mm

• Sheet Metal Fabrication: Maximum flat sheet 1,193.8 mm × 3,022.6 mm (47″ × 119″); formed part minimum 38.1 mm × 38.1 mm (1.5″ × 1.5″)

• Swiss Machining: Ideal for micro-parts from 1 mm to 32 mm diameter

If your part exceeds these ranges, please contact us. We can often accommodate larger workpieces with special setups.

Yes. Our Swiss-type CNC machines are specifically designed for small and micro-part production, commonly used in medical, watchmaking, and precision electronics industries.

For drilling:

• Standard CNC drilling: holes as small as 1.0 mm diameter are routine

• Micro-drilling capability: holes down to 0.5 mm or smaller depending on material and depth-to-diameter ratio

• Our EDM services can achieve extremely small holes and features in hard materials where mechanical drilling is impractical

Please specify your target hole diameter and aspect ratio when submitting your RFQ so we can confirm feasibility.

Yes, gear manufacturing is a specialized service at Junying. We produce custom gears using various processes:

• Spur gears, helical gears, bevel gears, worm gears, and racks

• Gear hobbing, shaping, milling, and grinding capabilities

• Modules from 0.5 to 10 (or larger, project-dependent)

• Materials: steel (including hardened), stainless steel, brass, aluminum, nylon, POM/Delrin

Our guide section includes detailed technical articles on spur gear geometry, module calculations, and terminology. Please provide your gear specifications (module/pitch, number of teeth, pressure angle, material, and accuracy grade) for a targeted quote.

Yes, EDM and Wire EDM are part of our cooperative supply services:

• Wire EDM: Routine tolerance ±0.005 mm; special applications down to ±0.001 mm

• Sinker/Die-Sinking EDM: Ideal for deep cavities, sharp internal corners, and complex geometries in hard materials

• Cavity depth capability: 200–300 mm typical; deeper depths evaluated on a project basis

EDM is particularly valuable when machining hardened tool steels, titanium, or parts with features that are impossible to produce with conventional cutting tools.

Yes, one-stop service is a core value proposition at Junying. We can:

• CNC machine your precision components (milled, turned, drilled)

• Fabricate sheet metal enclosures, brackets, or structural parts

• Assemble the components into finished sub-assemblies or products

• Apply coordinated surface finishing across all parts for consistent appearance

• Package and ship everything as a single consolidated delivery

This approach eliminates the overhead of coordinating multiple vendors, reduces shipping costs through consolidation, and ensures consistent quality and finish across all components.

Yes. Our 3D printing capabilities include both plastic and metal technologies:

SLM/DMLS is our metal 3D printing technology, suitable for fully dense metal parts directly from CAD data without tooling.

We machine a comprehensive range of metals:

• Aluminum: 6061-T6, 7075, 5052-H32, 3003-H14, 1100-H14, 2024 (6061 is the most popular for its excellent machinability and cost-effectiveness)

• Stainless Steel: 303, 304, 316/316L, 420, 440C

• Carbon & Alloy Steels: 1018, 1045, 4140, 4340, 8620

• Brass: C360 (free-cutting), C260, C353

• Copper: C101 (oxygen-free), C110

• Titanium: Grade 2, Grade 5 (Ti-6Al-4V)

• Tool Steels: D2, A2, O1, H13

• Exotic Alloys: Inconel, Monel, Hastelloy, tungsten, cobalt alloys

If your required grade is not listed, please inquire — we source specialty materials on demand.

Yes, CNC plastic machining is a major part of our service. Materials we regularly process include:

• Engineering plastics: PEEK, PTFE (Teflon), POM (Delrin/Acetal), Nylon (PA6, PA66), Polycarbonate, PMMA (Acrylic)

• General plastics: ABS, HDPE, LDPE, Polystyrene, PVC

• High-performance plastics: PEI (Ultem), PPS, PET, PPSU

Each plastic has unique machining characteristics. PEEK requires controlled cutting parameters to avoid thermal degradation; PTFE is soft and requires sharp tooling for dimensional accuracy; polycarbonate needs care to prevent stress cracking. Our engineers are experienced with all these materials.

Absolutely. Material recommendation is a standard part of our quotation support. To make an informed suggestion, we typically need to understand:

• Mechanical requirements: Strength, hardness, wear resistance, fatigue life

• Environmental conditions: Temperature range, exposure to chemicals, moisture, UV

• Functional requirements: Electrical conductivity, thermal conductivity, weight constraints

• Regulatory needs: FDA, RoHS, REACH, aerospace-grade certification

• Cost targets: Budget constraints and production volume

For example: If you need a lightweight structural part with moderate strength and excellent corrosion resistance at a low price point, we would typically recommend aluminum 6061-T6. If you need a high-strength wear-resistant component in a chemically aggressive environment at high temperature, PEEK or 316 stainless steel might be more appropriate.

• Material certificates (mill test certificates / MTC): Available upon request — we can provide traceability back to the original material heat/lot number

• RoHS compliance: Standard documentation available for all commonly used materials

• REACH compliance: Available upon request

• Third-party material testing: We can arrange independent lab verification at additional cost if required

• DFARS / domestic sourcing: Certain materials can be sourced to meet specific country-of-origin requirements; please specify when quoting

• Titanium (Grade 2 and Grade 5): Routinely machined; we have optimized cutting parameters and dedicated tooling for titanium

• Invar (FeNi36): Available upon request for applications requiring extremely low thermal expansion (precision instruments, aerospace)

• Magnesium alloys: Machinable with appropriate safety protocols (our shop has the necessary fire safety measures for magnesium)

• Inconel, Monel, Hastelloy, tungsten, and cobalt alloys: Available depending on specific grade and availability

Exotic materials typically have longer lead times for raw material procurement and higher machining costs due to tool wear. We recommend starting with a prototype in a more common material for design verification before committing to production in exotic alloys.

• Material procurement by us: This is the standard approach. We source from our approved supplier network with full traceability. Material cost is included in the quotation.

• Customer-supplied material (free-issue): Accepted. Please note that we are not responsible for material defects in free-issue stock, and we recommend providing extra material allowance for setup and test cuts.

• No minimum material order: We stock common grades (6061 aluminum, 304 stainless, C360 brass, ABS, Nylon) in-house. For specialty materials, we procure what your project requires, even for single prototypes.

Our quotations are completely free with no obligation. Typical response times:

• Online instant quote system: Available 24/7 via cnclathing.com/quote — upload your 3D CAD file and receive an automated estimate immediately

• Manual review quotes: Within 24 hours (often faster) for parts requiring engineering review, complex assemblies, or specific surface treatment requirements

To get the fastest and most accurate quote, provide a 3D CAD model (STEP, IGES, or X_T format), a 2D drawing with tolerances, material specification, quantity, and any surface finishing requirements.

For the most accurate quote, we recommend submitting both:

• 3D CAD model: STEP (.stp), IGES (.igs), or Parasolid (.x_t) preferred; STL accepted for less complex parts

• 2D drawing (PDF): With all critical dimensions, tolerances, thread specifications, surface finish callouts, and GD&T references where applicable

A 2D drawing alone is acceptable for simple turned parts, but for milled parts with complex geometries, a 3D model is strongly recommended. Without a 3D model, we may need to clarify design intent, which can delay the quotation.

CNC machining costs are calculated based on a combination of factors. Here are reference rates for estimation:

The final piece price is derived from: machine time cost + material cost + tooling/setup amortized over quantity + surface finishing + quality inspection + packaging & shipping. Higher quantities drive per-piece cost down significantly due to setup amortization.

Our sample policy balances risk between both parties:

• Sample / prototype orders: Priced according to standard rates (no premium for low quantity), but setup costs are concentrated on fewer pieces, so per-unit cost is higher than production runs

• Sample fee credit: For many projects, we offer a policy where a portion or all of the sample tooling/setup cost is credited toward the first production order when the production quantity exceeds a threshold

• Free samples: In limited cases, we can provide generic capability samples (not your design) to demonstrate quality. These are existing parts from our product catalog

The specific policy is negotiated per project. Please discuss your expectations during the quotation phase.

No minimum order quantity. We are happy to produce quantities from a single prototype to mass production runs of thousands of pieces.

• 1 piece: Supported. Ideal for prototyping, proof-of-concept, and one-off replacement parts. Per-unit cost will be higher due to setup costs not being distributed.

• 10–100 pieces: Low-volume production. Good balance of cost and flexibility for bridge production or small-batch manufacturing.

• 100–1,000+ pieces: Production volumes. Maximum cost efficiency through setup amortization and process optimization.

This flexibility is one of the key advantages of CNC machining over processes like injection molding that require expensive tooling before the first part can be produced.

Effective cost reduction starts at the design stage. Our recommendations:

1. Choose cost-effective materials wisely: Aluminum 6061 is one of the most affordable and machinable metals. Avoid specifying premium materials like titanium unless the application truly requires their properties.

2. Optimize your geometry: Avoid unnecessarily deep pockets (keep depth-to-diameter ratio below 4:1 where possible), eliminate sharp internal corners by adding fillets matching standard tool radii, and maintain consistent wall thicknesses.

3. Reduce complexity where possible: Every additional setup, undercut, or tightly toleranced non-functional feature adds cost. Ask: does this feature serve a function?

4. Minimize setups and reorientations: Design parts so that as many features as possible can be machined from a single orientation. Multi-side machining increases cost significantly.

5. Use standard tolerance grades: Specify tight tolerances (±0.01 mm or tighter) only on functional and assembly-critical features. General dimensions can use ISO 2768-m or broader tolerances.

6. Be selective with surface finishing: Apply finishes only where functionally or aesthetically necessary. Each additional finishing step adds cost and may affect dimensional tolerances.

7. Design for standard tooling: Avoid custom thread profiles and non-standard hole sizes when standard alternatives exist.

We offer Design for Manufacturability (DFM) feedback as part of our quotation process. Upload your model and we will flag cost-saving opportunities before production begins.

• Quotation validity: Typically 30 days from the date of issue. After this period, we may need to refresh the quote to account for material price changes or currency fluctuations.

• Exchange rate: Our standard quotations are issued in USD. For large or long-lead-time orders, we may include a currency adjustment clause. We generally absorb minor fluctuations for the benefit of client relationships.

• Price lock: For confirmed production orders with a deposit, we can lock pricing for a defined period regardless of short-term market movements.

Mold and tooling costs are quoted separately from the per-piece part price and are evaluated on a case-by-case basis. Key factors include:

• Part size and complexity: Larger parts with intricate features require larger, more complex molds

• Cavity count: Single-cavity vs. multi-cavity molds; higher cavity count increases tooling cost but reduces per-piece cost

• Mold material and expected life: Aluminum molds (prototype/short-run, ~1,000–10,000 shots) vs. hardened steel molds (production, 100,000+ shots)

• Surface finish requirements: Textured, polished, or high-gloss finishes add mold cost

• Side actions, slides, and lifters: Features that prevent straight-pull ejection add complexity and cost

For budget estimation, a simple single-cavity aluminum prototype mold may start from a few thousand USD, while a multi-cavity hardened steel production mold for a complex part can range significantly higher. Contact us with your part model for an accurate mold quotation.

• Standard prototyping turnaround: 7–10 business days from order confirmation and receipt of approved design files

• Simple parts (single setup, common material): As fast as 3–5 business days

• Complex multi-setup or multi-process prototypes: 10–14 business days

• Expedited / rush service: Available for an additional charge; please specify your required date when submitting the RFQ

Turnaround time depends on current shop loading, material availability, and part complexity. We maintain an average on-time delivery rate of 99.85%.

• Average production turnaround: 7 business days once all materials and tooling are in place

• Small batch (10–100 pieces): Typically 1–2 weeks

• Medium batch (100–1,000 pieces): Typically 2–4 weeks

• Large batch (1,000+ pieces): Lead time confirmed during quotation, based on current capacity

• Combined CNC + sheet metal + finishing + assembly: Add 3–5 business days for multi-process coordination

We communicate your delivery timeline at the quotation stage and provide regular updates throughout production.

• Rush / expedited service: Available on request. We assess current shop loading and material availability to determine if rush is feasible.

• Fastest possible turnaround: 24–72 hours for simple, single-setup parts in stocked materials (subject to current capacity)

• Expedite surcharge: Typically 30–50% of standard cost, depending on the level of production disruption and overtime required

• Rush shipping: We can use express courier services (DHL, FedEx, UPS) for 1–3 day international delivery at additional shipping cost

We recommend building in standard lead times to your project plan and using expedite service only for genuine emergencies to avoid unnecessary cost.

We offer flexible shipping arrangements based on your preference:

• Express courier (DHL, FedEx, UPS, TNT): 3–7 business days, door-to-door tracking, best for prototypes and small batches

• Air freight: 5–10 business days, suitable for medium-weight, time-sensitive orders

• Sea freight: 20–40 days, most economical for large/heavy production orders

• Rail freight: Available for certain Europe-Asia routes

Trade terms we can accommodate:

• EXW (Ex Works): You arrange pickup from our factory

• FOB (Free On Board): We handle export clearance and deliver to the port/airport

• CIF (Cost, Insurance, Freight): We cover freight and insurance to your destination port

• DDP (Delivered Duty Paid): We handle everything including import duties and taxes; available for select destinations

Freight cost is quoted based on shipment weight, dimensions, destination, and delivery speed. We recommend providing your shipping preferences when requesting a quote so we can include accurate logistics costs.

We support EXW, FOB, CIF, and DDP (subject to destination country). Our general guidance:

• If you have an existing freight forwarder relationship: FOB is the most common and straightforward choice. You control the shipping and can negotiate competitive rates with your forwarder.

• If this is your first import from China and you want a hassle-free experience: DDP is the simplest. We handle everything from our factory to your door, including customs clearance and duties. Not available for all countries.

• If you have experience with import logistics and want cost transparency: CIF gives you visibility of freight cost while you manage destination clearance.

For first-time customers, we typically recommend starting with FOB or CIF and using our recommended freight forwarders.

• Individual part protection: Each precision part is wrapped in protective material (VCI paper for corrosion-prone metals, anti-static bags for electronics, bubble wrap or foam padding)

• Compartments and dividers: Multiple parts in one shipment are separated by individual compartments or custom-cut foam inserts to prevent part-to-part contact

• Outer packaging: Heavy-duty export-grade corrugated cartons for small shipments; plywood crates or pallets for heavy/large shipments

• Moisture protection: Desiccant packs and vacuum sealing for moisture-sensitive materials and long sea freight journeys

• Custom packaging: We can accommodate custom labeling, barcoding, kitting, and retail-ready packaging upon request

Our packaging has been refined over 20 years of international shipping experience. We have encountered and solved virtually every transit damage scenario. If you have specific packaging requirements (e.g., aerospace clean-room packaging), please specify them in your order.

• CMM (Coordinate Measuring Machine): 3D precision measurement for geometric and dimensional verification of complex parts

• Laser scanning systems: Non-contact 3D surface measurement and comparison to CAD nominal

• Digital measuring instruments: Calipers, micrometers, height gauges, bore gauges, thread gauges, and go/no-go fixtures, all with regular calibration traceability

• Surface roughness testers: Ra, Rz measurement and verification

• Hardness testers: Rockwell and Brinell hardness verification for heat-treated parts

• Temperature-controlled inspection laboratory: Ensures measurement accuracy by eliminating thermal expansion variables

100% inspection is available upon request and is typically specified for safety-critical or tight-tolerance features. Standard practice is first-article inspection (FAI) plus statistical sampling (AQL-based) for production runs, which balances quality assurance with cost efficiency.

• Standard documentation (included at no extra charge): Certificate of Conformance (CoC), packing list, commercial invoice, material certificates (upon request)

• First Article Inspection (FAI) report: Available upon request. Performed per AS9102 or your company-specific FAI template. This verifies that the first production part meets all drawing specifications before the full production run proceeds.

• In-process inspection reports: Available for critical production runs, documenting key measurements at defined production checkpoints

• Full dimensional inspection reports: Comprehensive measurement data for every dimension on the drawing; typically used for high-value, tight-tolerance, or safety-critical parts

• SPC (Statistical Process Control) data: Available for high-volume production where process capability tracking is required

Please specify your quality documentation requirements during the quotation phase so we can include the appropriate inspection scope in your quote.

Our quality control is integrated throughout the production process, not just at final inspection:

1. Incoming material inspection: Verification of material grade, dimensions, and certification against order requirements before release to production

2. In-process inspection (IPQC): Operators perform defined measurements at specified intervals during production; QA inspectors conduct independent spot checks

3. First-article inspection (FAI): Complete dimensional verification of the first-off part from each setup or batch before continuing production

4. Final inspection (FQC): Dimensional, visual, and surface finish verification before packaging

5. Pre-shipment inspection: Random sampling audit against AQL standards and specific customer requirements

Regarding SPC and Cpk:

• We can implement SPC for high-volume production runs, tracking key characteristics (KCs) with X-bar/R charts or similar methods

• Target Cpk ≥ 1.33 for standard production; Cpk ≥ 1.67 achievable for critical features with optimized processes

• SPC requirements should be specified during quotation so we can build the appropriate inspection time and documentation into the price

We handle quality issues promptly and transparently. The process is:

1. Notification: Contact us within 14 days of receiving the shipment. Provide photos, measurement data, and a clear description of the non-conformance.

2. Root cause analysis: Our quality and engineering teams will review the claim against your drawing/specifications and our production records to identify the root cause.

3. Confirmed manufacturing defect: We will remake the affected parts at our expense and ship them via the fastest available method. Alternatively, we may issue a credit or refund, per your preference.

4. Disputed claims: If there is disagreement about whether parts meet the agreed specification, we will jointly review the evidence (including reference to the approved drawing, tolerance specifications, and accepted industry standards) to reach a fair resolution.

5. Preventive action: Every quality claim triggers a CAPA review in our system. We will share the corrective action plan with you.

To facilitate smooth resolution, we highly recommend that you inspect parts immediately upon receipt rather than weeks or months later.

Our standard approach depends on the inspection scope agreed in your order:

• Basic inspection (standard): Verify all dimensions with explicit tolerances on the drawing using appropriate measurement tools. General dimensions (those without individual tolerances) are verified against reference tolerances (e.g., ISO 2768-m or as specified on the drawing).

• Critical dimension focus: When you designate certain dimensions as Critical-to-Quality (CTQ) or Key Characteristics (KC), we give these dimensions special attention with 100% inspection, tighter measurement protocols, and documented results.

• Full dimensional inspection: Every dimension on the drawing is measured and recorded. This is used for FAI, high-value parts, or regulated industry requirements.

The right inspection approach balances quality assurance with cost. We never ship parts that fail to meet agreed specifications, but over-specifying inspection scope adds unnecessary cost. We are happy to advise on an appropriate inspection plan for your parts.

Yes. Our Design & Engineering service can take your concept from sketch to production-ready CAD model. The typical workflow is:

1. Concept review: Share your sketch, reference images, functional requirements, and any known constraints (size, load, environment, target cost)

2. CAD modeling: Our engineers create a detailed 3D CAD model (in SolidWorks, Inventor, or your preferred format) incorporating DFM principles

3. Design review: You review and approve the model. We iterate until the design meets all your requirements

4. Prototyping: We manufacture a prototype for physical validation

5. Production: After prototype approval, we transition to production

Design services are quoted separately from manufacturing. Having us do both design and manufacturing ensures that parts are designed for efficient production from the start.

Yes, reverse engineering and redesign are established services at Junying. Our reverse engineering capabilities include:

• 3D scanning: High-precision laser scanning to capture the geometry of your physical part and create a digital point cloud

• CAD reconstruction: Our engineers convert scan data into a parametric 3D CAD model (STEP/IGES/X_T format) suitable for manufacturing

• Recreating legacy parts: Reviving out-of-production components when original drawings are unavailable

• Product improvement: Identifying design weaknesses in the original part and proposing manufacturing or functional improvements during the reverse engineering process

• DFM optimization: Adapting the reverse-engineered geometry for cost-effective CNC machining (original parts may have been designed for casting, forging, or other processes)

This service is ideal when: the OEM no longer exists, drawings are lost, you need to create a backup supply source, or you want to improve an existing design.

Yes, DFM review is a standard and valued part of our quotation process at no additional cost. When you submit your design for quotation, our engineers will review it and may flag:

• Features that are difficult or impossible to machine with standard tooling (e.g., sharp internal corners, deep narrow pockets, undercuts without EDM)

• Unnecessarily tight tolerances on non-functional features that drive up cost without adding value

• Wall thickness concerns (too thin = vibration/chatter risk; too thick = unnecessary material cost)

• Thread and hole geometry optimization (blind vs. through holes, standard vs. custom threads)

• Material selection alternatives that could reduce cost while meeting performance requirements

• Surface finish specifications that may conflict with dimensional tolerance requirements

• Assembly and fit considerations if multiple parts are being manufactured

Our DFM feedback is always presented as suggestions — the final design decisions remain yours. Many of our customers report significant cost savings (15–30% or more) by incorporating DFM suggestions before starting production.

We accept a wide range of CAD formats. Here is our preference ranking:

1. STEP (.stp / .step) — Best overall. Widely compatible, retains solid body geometry with high fidelity. Our recommended format.

2. Parasolid (.x_t / .x_b) — Excellent. Native to many CAD systems (SolidWorks, NX). Compact and accurate.

3. IGES (.igs / .iges) — Good. Older standard; acceptable but can lose feature information compared to STEP.

4. STL (.stl) — Limited. Faceted mesh format; loses geometric precision due to triangulation. Acceptable for quoting but not ideal for manufacturing unless tolerances are clearly documented in a 2D drawing.

5. Other formats: DXF/DWG (2D), SolidWorks (.sldprt), Inventor (.ipt) — acceptable where available.

Regardless of format, we always recommend pairing your 3D model with a dimensioned 2D drawing (PDF) that clearly specifies critical dimensions, tolerances, threads, and surface finish requirements.

Yes. CNC Programming Services is an independent service offering at Junying, available whether or not we manufacture the parts:

• CAM programming from your 3D CAD model: We generate toolpaths, select cutting strategies, and produce G-code optimized for your machine tool (if you plan to machine in-house)

• Integrated programming + manufacturing: When we both program and produce the parts, programming cost is typically included in the part price rather than charged separately

• Multi-axis programming: 3/4/5-axis programming with full machine simulation to verify toolpath safety and efficiency before cutting

• Post-processor availability: We can generate code for most major CNC controller brands (Fanuc, Siemens, Heidenhain, Haas, Mazak, etc.)

Please specify your machine make and model, controller type, and available tooling if you need standalone CNC programming.

We offer 12 major categories of surface finishing, with numerous sub-options within each:

For anodizing specifically, we offer: clear/natural, black, red, blue, gold, green, and other custom colors. Hard anodize (Type III) is available for applications requiring superior wear resistance. Please specify your desired color (Pantone or RAL reference preferred).

Anodizing does affect dimensions, and the amount depends on the type of anodizing:

• Type II (decorative/sulfuric anodize): The coating grows approximately 50% outward and 50% inward from the original surface. A typical 10 μm coating may add ~5 μm per surface. On a diameter, this adds approximately 10 μm total.

• Type III (hard anodize): Thicker coating, typically 25–50 μm. Dimensional growth is more significant and must be accounted for in the machining stage.

• Threaded features: Anodizing can affect thread fit. We typically machine threads slightly oversize to compensate for the coating thickness.

For high-tolerance parts, we generally do not recommend secondary surface treatments that add a layer, as they can alter critical dimensions. If anodizing is essential, we will machine the part with appropriate pre-coating allowances so that the finished dimensions remain within tolerance. Please discuss this requirement during quotation so we can plan the machining strategy correctly.

Yes, we offer Type III hard anodizing. Key differences from standard Type II anodizing:

Hard anodizing is the right choice when your aluminum part needs to withstand abrasive wear, high-friction environments, or corrosive conditions. Common applications include pistons, gears, valves, sliding components, and military/tactical equipment.

• RoHS compliance: Standard plating and coating processes are RoHS-compliant. We avoid restricted substances (lead, mercury, cadmium, hexavalent chromium, PBBs, PBDEs) in our finishing processes.

• Food-grade finishes: We can apply food-safe coatings and finishes. Electropolished stainless steel (304/316) is commonly used for food-contact surfaces. Specify FDA or EU food-contact requirements when quoting.

• Medical-grade finishes: Passivation per ASTM A967, electropolishing, and controlled anodizing are available for medical devices and instruments. We can work to your specific medical device quality requirements.

• Aerospace finishes: Anodizing per MIL-A-8625, passivation per AMS 2700, and other aerospace-standard finishes are available.

For regulated industries, please provide the exact specification or standard number you need us to comply with. If third-party certification of the finish is required, we can arrange independent lab verification.

CNC machining inherently produces highly repeatable parts because the process is computer-controlled. Beyond this fundamental advantage, we employ several measures to guarantee batch-to-batch consistency:

• Golden Sample Retention: The approved prototype or first-article part is retained as a physical reference standard for production batches

• Documented Setup Sheets: Every machine setup, tooling configuration, and cutting parameter is documented and archived, ensuring identical setups for repeat orders

• First-Article Inspection (FAI) per Batch: The first part from each new production batch undergoes full dimensional inspection against the approved drawing before the batch continues

• In-Process Checks: Key dimensions are checked at defined intervals throughout the production run, with defined control limits

• Tool Wear Monitoring: Cutting tools are replaced on a schedule to prevent dimensional drift due to tool wear during long runs

• Process Capability Tracking: For high-volume repeat orders, we can implement SPC tracking to demonstrate and maintain process stability (Cpk ≥ 1.33)

The result: your 1,000th part will be functionally identical to the prototype you approved. This repeatability is one of the strongest arguments for CNC machining over manual processes.

We accept the following payment methods:

• T/T (Telegraphic Transfer / Bank Wire): Most common for international orders. Fast, low-cost, widely available.

• PayPal: Accepted for smaller orders and prototypes. Convenient for first-time customers.

• Letter of Credit (L/C): Available for larger production orders where both parties prefer bank-intermediated security.

• Western Union: Accepted for small, urgent payments.

Standard payment terms for new customers:

• Prototype / small orders: 100% advance payment or 50% deposit with 50% balance before shipment

• Production orders: Typically 50% deposit to initiate production, 50% balance before shipment. Terms may be adjusted based on order value and relationship history.

• Credit terms (Net 30 / Net 60): Available for established customers after a successful order history. We understand that corporate procurement systems often require credit terms, and we can work toward this as the relationship develops.

All payments are processed in USD unless otherwise agreed. For first-time orders, we recommend starting with a smaller prototype order to establish mutual confidence before scaling to larger production volumes.