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Frequently Asked Questions

Quoting, lead time, materials, processes, quality — answers to what matters to you

Company
Strength
20 Years of Experience
20 Years of Experience
72 Sets of CNC Machines
72 Sets of CNC Machines
Precision: ±0.01mm
Precision: ±0.01mm
7-15 Days Fast Shipping
7-15 Days Fast Shipping
Quality
Advantages
No Knife Marks
No Knife Marks
No Scratches
No Scratches
No Blemishes
No Blemishes
No Color Difference
No Color Difference
01

General Questions

How to Confirm My Design Is Manufacturable Reliably?

After you upload your 3D model, our system performs automatic DFM (Design for Manufacturability) analysis, flagging features that may cause machining difficulties, such as thin walls, deep cavities, or overly tight tolerances. Our engineering team provides optimization recommendations during the quoting stage.

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How Are We Different from Other Manufacturing Platforms or Intermediaries?

We are an in-house factory operator with 3 self-managed facilities, not an outsourced supply chain. This direct control allows us to manage production quality and delivery times. Our in-house model eliminates middlemen, enabling us to provide stable quality, faster response, and a more transparent manufacturing process.

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What surface finishes and colors are available?

We offer over 30 surface finishes, including anodizing, sand blasting, brushed, polished, plated, powder coated, passivation, etc., providing a wide range of standard and custom color options.

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Do you provide material certificates or test reports?

Yes. We provide material certificates, RoHS compliance certificates, First Article Inspection (FAI) reports, dimensional measurement reports, and functional test reports to support your quality management system.

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What to Do If Parts Do Not Meet Required Specifications?

We conduct strict quality inspections on all parts. If a part does not meet the agreed specifications, we will provide free remanufacturing or a refund. Please retain the part and contact us within 30 days of receipt.

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02

Machining Process FAQs

What Is the Difference Between 3-Axis and 4-Axis CNC Machining?

In 3-axis CNC machining, the tool moves along straight X, Y, and Z axes. In 4-axis machining, a rotary A-axis is added, allowing the workpiece to rotate. This enables the machining of complex features on multiple sides without re-fixturing.

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What file formats do you accept for CNC machining?

We accept STEP(.stp), IGES(.igs), SolidWorks(.sldprt), Parasolid(.x_t), and STL files. For the most accurate quotes, STEP is the preferred format.

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What Is the Typical Surface Roughness for 3-Axis Machined Parts?

Standard machined surface roughness is 125 Ra (3.2 µm); finish machining achieves 63 Ra (1.6 µm). Post-processing such as sandblasting or polishing can further improve surface quality.

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Do You Offer 3-Axis CNC Machining for Mass Production?

Yes. We specialize in mass production with a 100-piece MOQ and can handle batches of 100,000+ units. Volume-based tiered discounts apply.

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What Are the Advantages of 4-Axis Machining Over 3-Axis?

4-axis machining adds rotational capability, allowing features on multiple faces to be machined in a single setup. This reduces clamping time, improves accuracy between faces, and enables the production of cylindrical profiles and continuous spiral geometries.

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What Types of Parts Are Best Suited for 4-Axis Machining?

Parts requiring features on multiple faces, cylindrical surfaces, cam profiles, or helical geometries—and any part where continuous rotation is required during cutting—are perfectly suited for 4-axis machining.

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Can 4-Axis CNC Machining Produce Threads?

Yes, we produce internal and external threads using thread milling or 4-axis spiral interpolation. Tapped holes in standard thread specifications are also available.

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Is 4-axis machining more expensive than 3-axis machining?

Although the hourly machine rate is slightly higher, 4-axis machining typically reduces total costs by minimizing the number of setups. For complex multi-sided parts, 4-axis machining is often more cost-effective than multiple 3-axis setups.

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03

Material Issues

Can CNC Machining of Acrylic (PMMA) Achieve a Mirror Finish?
Yes. Acrylic is one of the few plastics that can achieve a mirror finish directly through cutting. We use single-crystal diamond tools for precision machining, followed by flame polishing or diamond grinding. Surface roughness is consistently controlled within Ra0.4μm, delivering a high-gloss appearance free of scratches or defects, resembling a mirror. No secondary coating is required. For batch production, identical parameters are used to ensure consistent mirror finish quality.

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Why Do Acrylic Edges Turn White and Surfaces Get Hazy After Machining?
This is typically caused by excessive cutting heat. Acrylic has low thermal conductivity, so slow feed rates, high speeds, or dull tools cause chips to melt and stick to the tool, resulting in haze and stress-induced whitening. Our approach uses monocrystalline diamond tools with high RPM and small depths of cut, along with air cooling or minimal lubrication to dissipate heat. We leave a 0.05-0.1mm finishing allowance before final machining to prevent heat accumulation on already processed surfaces.

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Fine Scratches on Transparent Parts: How Do We Ensure Undamaged Delivery?
Scratches on transparent plastic parts mostly occur during handling rather than machining. We isolate processes to prevent damage: protective films are applied throughout, independent trays prevent stacking between stations, and dedicated fixtures ensure proper positioning. Final inspection is performed under standard light boxes to check each unit's appearance. We guarantee a high-gloss, scratch-free, and flawless finish, not just "imperceptible" defects.

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Why PTFE Parts Often Exceed Tolerances After Machining?
PTFE has a low elastic modulus and significant creep; clamping and cutting forces cause deformation and rebound upon release. We employ low-stress clamping (soft jaws or vacuum) and symmetrical layered material removal, with intermediate stress relief if needed. After final machining, parts rest for 24 hours to release stress before final inspection, ensuring batch size consistency within ±0.01mm.

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How High Temperatures Can PTFE Withstand? Is It Suitable for Seals?
PTFE maintains long-term usage temperatures from -200°C to +260°C, with higher short-term tolerance. It resists nearly all chemical media and has a friction coefficient as low as 0.04, making it a common material for pump and valve seals, bearing slides, and insulators. For load-bearing conditions, we recommend glass, carbon, or bronze-filled grades, which offer significantly better creep resistance and wear performance.

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Does PEI (Ultem) Need Drying Before Machining?
Yes, drying is mandatory. PEI has a high moisture absorption rate; machining wet material causes hydrolysis at process temperatures, leading to silver streaks, bubbles, and hazy surface defects. We standardize a 150°C drying process for 4 hours or more before machining. Post-machining, we perform stress-relief annealing to prevent stress cracking during assembly or use.

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PEI vs PEEK: How to Choose?
Temperature and cost guide selection. PEI offers long-term service up to 170°C (Tg 217°C), inherent flame retardancy, and lower cost than PEEK, ideal for aerospace interiors, electrical insulation, and medical device structural parts. PEEK withstands long-term temperatures up to 250°C with better chemical and wear resistance, suitable for high-heat, corrosive, or implant-grade applications. For temperatures below 170°C, PEI is usually more economical.

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PPS Is Too Brittle: How to Avoid Edge Chipping During Machining?
Use sharp tools with positive rake angles and shallow cuts to reduce cutting forces rather than forcing the material. Glass or carbon fiber reinforced grades are highly abrasive; use CVD diamond-coated or PCD tools, as dull cutters will crush the edges. Additionally, reinforced grades are anisotropic; we align tool paths with material flow direction and maintain uniform orientation in batch parts to ensure dimensional consistency.

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04

Industry Application FAQs

Which Industries Do Your CNC Machining Services Serve?

We provide precision CNC machining services for numerous industries, including automotive, communication, medical, audio, automation, 3C electronics, motorcycle, bicycle, aluminum alloy keyboard cases, aerospace, semiconductor, photography equipment, and energy. Each industry benefits from our certified quality systems, specialized material expertise, and engineering support tailored to their regulatory and performance requirements.

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Which certifications do you hold in these industries?

We hold ISO 9001:2015, AS9100D for aerospace and defense and medical devices, and IATF 16949 for automotive certifications, and have completed ITAR registration. These certifications ensure your parts comply with the highest global regulatory standards.

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Do You Support Both Rapid Prototyping and Low-Volume Production?

Yes. We focus on batch production with a 100-piece MOQ and handle 10,000+ units per batch. Unified parameters and QC ensure consistent precision across all volumes.

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Do you offer material selection and DFM optimization support?

Yes. Our engineering team provides free DFM analysis and material recommendations, tailored to your industry requirements. We evaluate design manufacturability, suggest optimal materials balancing performance and cost, and identify potential issues before production starts—saving you time and costs.

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How Do I Start a Project in My Industry?

Simply upload your CAD file through the quote page or contact our engineering team on WhatsApp. We will review your requirements and provide a detailed quotation with the best material and process recommendations within 24 hours.

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What Tolerances Are Achievable in CNC Machining?

Standard CNC machining achieves tolerances of ±0.05 mm. With coordinate measurement, precision work consistently reaches ±0.02 mm, while high-accuracy parts can attain ±0.01 mm. Surface finish is as fine as Ra0.4 μm. Mark critical dimensions and GD&T requirements directly on your drawing.

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What Is a Machining Center? How Does It Work?

A machining center is a CNC machine equipped with an automatic tool changer and multi-axis capabilities. It can perform multiple operations, including milling, drilling, and tapping, in a single setup, thereby enhancing precision and efficiency.

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Could you introduce your CNC machining production capacity?

We operate 72 CNC machines, including 3/4/5-axis milling, CNC turning, swiss lathes, and turn-mill centers. Additional EDM, wire cutting, and grinding machines are available. We specialize in batch production with a 100-piece MOQ and can handle batches of up to 100,000 units.

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05

Ordering & Delivery

What Is the Minimum Order Quantity for Swiss-Type CNC Parts?

Swiss-type CNC machining starts at 100 pieces. The guide bushing requires bar stock feeding, which is most economical for volumes from 100 up to 1,000,000+ pieces. Please contact us if you need prototype quantities.

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What Is the Typical Lead Time for Industry-Specific Parts?

Lead time depends on the industry and part complexity; volume orders typically take 15–25 days. Regulated industries such as medical may require additional validation and therefore longer lead times. Expedited scheduling is also available.

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How Is Your CNC Machining Service Priced?

Price depends on material, part size and complexity, tolerance requirements, surface finish and quantity. Upload your drawings for an instant quote; volume orders receive tiered discounts with no hidden fees.

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Is There a Minimum Order Quantity (MOQ) for CNC Machining?

We focus on volume production, with a standard MOQ of 100 pieces. Unit price decreases as volume grows, and we recommend the most economical production plan based on your annual usage and delivery requirements. Prototype quantities can be arranged separately with our engineering team.

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How Soon Will I Receive My Parts After Ordering?

Volume orders typically take 15–25 days, depending on part complexity, quantity and surface finish requirements, all confirmed at the quotation stage. Expedited scheduling is also available.

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How Fast Is Your Delivery?

CNC volume machining typically ships in 15–25 days, and injection molds usually deliver T1 samples within 2 weeks. Exact lead time depends on process, material, quantity and post-processing requirements, and is clearly stated in the quotation.

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Send Us Your Drawing — We Handle the Rest

Send your STEP / DWG / PDF drawing and get a detailed quote with free DFM analysis and process recommendations within 2 hours. No minimum order — from 1 piece.

Live inquiries
Michael · GermanyNeed 500 aluminum brackets, please quote
Sophie · FranceLead time for CNC turned stainless shafts?
David · USANeed 1000 injection molded ABS housings
Emma · UKCan you machine 5-axis titanium parts?