Frequently Asked Questions About Our CNC Machining Services

CNC machining is a computer-controlled subtractive manufacturing process that uses rotating cutting tools or turning operations to remove material from solid workpieces, producing precision components from metal, plastic, and composite materials. The process operates from digital CAD files converted into G-code instructions that guide tool movement, spindle speed, feed rate, and coolant delivery.

Submit a 3D CAD file (STEP, IGES, SolidWorks), a dimensioned drawing with tolerances, the material grade, the required quantity, and any finish or certification requirements. Complete information upfront prevents back-and-forth revisions and delivers an accurate price faster.

Prototype parts typically ship in 3 to 5 business days. Production orders depend on quantity and complexity, generally 10 to 20 business days. Expedited service is available for urgent projects.

STEP, IGES, SolidWorks, STL, AutoCAD DWG, and PDF drawings with dimensions and tolerances. STEP is preferred for its broad compatibility across CAD platforms.

3-axis moves the cutting tool in X, Y, and Z linear directions, suitable for flat faces and simple pockets. 4-axis adds a rotary axis for cylindrical features and angled surfaces. 5-axis adds two rotary axes, allowing complex freeform surfaces, deep cavities, and undercuts in a single setup.

There is no minimum order quantity. We machine single prototypes, small batches, and high-volume production runs with the same quality standards.

Yes, all materials are supplied with mill test reports and full traceability. Additional certifications are available upon request.

In-process probing verifies critical dimensions during cutting and compensates for tool wear. CMM inspection provides final dimensional validation. Every part ships with a dimensional inspection report and material certification.

A complete 3D CAD model and a 2D drawing with dimensions, tolerances, surface finish requirements, and any critical notes. The drawing is the legal specification; the model is the geometry reference.

We manage logistics including export documentation, crating, and shipping. Air freight takes 3-5 days to US/EU destinations; sea freight takes 20-30 days. Landed cost estimates are available upon request.

Yes, if the material is certified and traceable. We will confirm material condition and inspect dimensions before machining.

Yes, our engineering team reviews every design before production and provides optimization suggestions that reduce cost and improve manufacturability without compromising your design intent.

CNC milling uses rotating cutting tools to remove material from a stationary workpiece, creating flat surfaces, slots, pockets, and complex 3D contours. CNC turning rotates the workpiece against a stationary cutting tool, producing cylindrical parts like shafts, bushings, and fittings.

All common metals: aluminum, steel, stainless steel, titanium, brass, copper, bronze, magnesium, tungsten, Inconel, and specialty alloys. Engineering plastics: PEEK, Acrylic, Nylon, Delrin, PTFE, PVC, and composites.

Standard milling and turning hold ±0.02mm to ±0.05mm. Precision work holds ±0.01mm. High-precision reaches ±0.005mm on request. Grinding achieves ±0.002mm on critical features.

As-machined, grinding, polishing, anodizing, electroless nickel, hard chrome, zinc plating, powder coating, passivation, bead blasting, brushing, and black oxide.

Milling: up to 2,000mm x 800mm x 600mm. Turning: up to 600mm diameter and 1,500mm length. Swiss turning: up to 32mm diameter for long, slender parts.

Use the largest possible tool diameter, shortest tool overhang, and balanced cutting parameters. For thin-wall features, use specialized toolpaths, reduced radial engagement, and climb milling techniques.

Swiss turning uses a sliding headstock and guide bushing that supports the workpiece close to the cutting point, providing exceptional stability for long, slender parts with length-to-diameter ratios exceeding 10:1.

Overcut: prevented by using larger, shorter tools and optimizing feed/speed. Collision: prevented by program simulation and careful setup verification. Poor surface finish: prevented by high-speed finishing, fine step-over, and proper coolant.

Yes. CNC machining requires no dedicated tooling, making single prototypes and low-volume production economical. We machine 1 to 100,000+ parts per year.

CAM software takes your 3D CAD design and generates toolpaths that control the CNC machine, specifying tool selection, cutting speeds, feeds, and tool positioning. Simulation verifies toolpaths and detects collisions before machining begins.

3D printing builds parts layer by layer from digital 3D models. Unlike CNC machining which removes material, 3D printing adds material only where needed, enabling complex internal channels, organic geometries, and lattice structures that are impossible or expensive to machine.

FDM extrudes molten plastic filament layer by layer. SLA uses a UV laser to cure liquid resin. SLS uses a laser to fuse powder material. DMLS prints metal parts directly.

Choose 3D printing when your part has complex internal channels, organic surfaces, or features that are impossible to access with cutting tools. Choose it for rapid iteration when the design is still changing.

Tolerances are generally looser than CNC machining. Layer lines are visible and affect surface finish. Part size is limited by build volume. Not all materials are available for all processes.

Lead times are typically faster than CNC machining—same day to a few days for many parts, making 3D printing ideal for rapid prototyping and fast iteration cycles.

A computational design method that finds the most efficient material distribution within a defined design space for given loads and constraints. The algorithm produces organic geometry using material only where it provides structural benefit.

Most FDM prints require supports once you exceed approximately a 45° overhang angle. If a surface matters cosmetically or functionally, orient the part so that surface is not a supported face.

Sanding removes layer lines. Vapor smoothing creates an optical glass-like finish. Bead blasting creates uniform matte texture. Painting and coating improve appearance and durability.

FDM is cost-effective for functional plastic parts and quick iterations. SLA offers fine detail and smooth surfaces. SLS requires no supports and produces strong durable parts.

3D printing has no tooling cost, enables fast iteration, but has higher per-part cost and is limited to low volume. Injection molding has high tooling cost but low per-part cost and is ideal for high volume.

Injection molding injects molten plastic or other materials into a precision-machined mold cavity, where it cools and solidifies into the final part shape. It is the most common method for high-volume production of plastic parts.

Choose injection molding when production volumes exceed 1,000 units and per-part cost justifies the tooling investment. CNC and 3D printing are more cost-effective for low-volume production.

Draft direction for part release, undercuts requiring side actions, and uniform wall thickness to prevent sink marks and warpage. Pull direction and parting line should be decided early in design.

Mold build time: 2 to 12 weeks depending on complexity. Production lead time after mold completion: 1-2 weeks for sampling and validation.

Warpage, sink marks, short shots, jetting, flash, voids, and burns. All are prevented through process optimization and mold design refinement.

As-molded, polished (mirror finish), textured (grain patterns from mold etching), and EDM finishes (spark texture for matte or stippled surfaces).

All thermoplastics: ABS, polycarbonate, nylon, PEEK, acrylic, polyethylene, polypropylene, POM, and glass-filled grades. Elastomers and thermosets are also possible.

Prototype tooling uses lower-cost aluminum molds with faster lead time but limited longevity (1,000-10,000 shots). Production tooling uses steel molds with longer lead time but high durability (100,000-1,000,000+ shots).

Bridge production uses lower-cost tooling to produce 500-5,000 parts while full production tooling is being built, enabling market launch and customer validation before full-scale production.

Submit part geometry, annual quantity, material preference, and application description. The quote includes tooling cost, unit part price, estimated tool life, and lead time.

Start with the constraint that will cause a redesign if you're wrong. If you need tight tolerances, CNC is usually the shortest path. If you need high volume, injection molding is where you end up. If the part is still changing, 3D printing buys you iteration speed.

3D printing: 1-200 parts. CNC machining: 1-10,000+ parts. Injection molding: 1,000+ parts becomes cost-effective. Urethane casting: 10-200 parts for bridge production.

CNC machining wins for tight fits—bearing seats, press fits, and sealing surfaces can reliably hit ±0.01mm. 3D printing tolerances vary by technology. Injection molding is repeatable but shrinkage affects final dimensions.

CNC machining delivers the best as-machined surface finish. 3D printing typically requires post-processing for smooth surfaces. Injection molding surface is determined by the mold finish.

C_total = C_unit + (C_tooling / N) where N is the total production run volume. This accounts for both unit cost and tooling amortization.

Prototype with the process closest to your eventual production route. CNC-machined prototypes best represent injection molded parts. Printed prototypes are best for iteration speed. Transition triggers include demand exceeding 500 units or unit costs justifying hard tooling.

Visual prototypes are for form, fit, and aesthetic review. Functional prototypes require real production materials, accurate assembly dimensions, and usable surfaces. Printed prototypes may look acceptable but not reflect final material properties.

3D printing can produce shapes that are impossible to machine. CNC cares whether a cutter can reach a feature. Injection molding requires draft angles and uniform wall thicknesses for consistent cooling and release.

Choosing the process before defining the part's real purpose. Visual prototypes need different geometry than functional test parts. Production planning needs different constraints than development iterations.

Include unit cost × quantity, tooling and fixture costs, lead time and time-to-market impact, scrap yields and rework, and shipping and duties. The cheapest per-part price may not be the lowest total cost.