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Manufacturing services
CNC turning and milling for anyone who needs a part: students, makers, startups, machine shops, engineers and businesses of any size. Metal or plastic, 1 part or thousands, made in our own plant in Monterrey.
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At PREMSA we do precision CNC machining straight from your CAD: metal and plastic parts with tight tolerances, a good finish and the geometry you need. Before we cut, an engineer reviews your part so it comes out right and at the best cost. If something can't be made, we tell you.
We don't just cut parts: we check DFM, tolerances, material and inspection at the quote stage. That means fewer revisions, fewer surprises, and your part arrives the way you designed it. Want a head start? Read our ***CNC Machining Guidelines***(/resources/guides/cnc-design-guide) before you quote.
From rapid CNC prototypes to production lots, with no minimums. With milling, turning and mill-turn we make complex geometry, tight tolerances and repeatable parts, order after order. Your part, accurate and on time, made in our own plant in Monterrey and shipped across Mexico and abroad.
From uploading your CAD to getting your parts—fast and straightforward.
CNC machining is a precision subtractive manufacturing process used to produce high-accuracy metal and plastic parts directly from solid material stock. Computer-controlled machine tools remove material through milling, turning, or multi-axis operations to achieve tight tolerances, consistent geometry, and controlled surface finishes. CNC machining is the preferred process when dimensional accuracy, material integrity, and repeatability are critical to part performance.
Use CNC machining when your part has to fit other parts, carry a load, or handle heat or chemicals. It isn't just for prototypes: it's also for end-use parts, assemblies and components that have to last, in metal or engineering plastic.
1. CAD Definition & DFM
The 3D CAD model defines the precise geometry, datums, and critical features. This stage ensures Design for Manufacturability (DFM) and establishes technical interfaces for tight tolerances.
2. CAM Strategy & G-Code
Our engineers generate optimized toolpaths based on material properties, feature depth, and surface finish (Ra) requirements using advanced CAM software and G-code programming.
3. Precision Material Removal
The 3-axis mill or the live-tool lathe removes material with calibrated feeds, speeds and carbide tooling.
4. Metrology & Verification
Critical dimensions undergo rigorous quality control. Using calibrated metrology tools and optical comparators, we verify that every part meets the specified inspection levels and ISO standards.
High-Precision Tolerances
Ideal for components requiring tight fits, precision bores, or strict GD&T (Geometric Dimensioning and Tolerancing) compliance for aerospace and medical standards.
Engineering-Grade Materials
When your application demands end-use metals (Aluminum, Steel, Titanium) or high-performance plastics with specific thermal, chemical, and mechanical properties.
Batch Repeatability
Perfect for maintaining absolute dimensional consistency and surface integrity across small-to-mid batches or recurring production orders.
Complex Multi-Feature Geometry
Best suited for parts with intricate features, such as deep pockets, internal threads, or complex contours that require precise 3-axis milling or mill-turn machining.
Superior Surface Finishes
Essential when specific Ra (Roughness Average) values, cosmetic clarity, or specialized secondary coatings and anodizing are required for final use.
Scalable Production Volumes
Makes sense from a single prototype to runs of thousands of parts, with no mold to pay for.
We pick the process based on your part's geometry, tolerance, material and quantity. We review your design, plan tooling and setups, and hold dimensions and finish, whether it's 1 part or a full lot.You bring the part; we pick how to make it.
High-speed 3-axis CNC milling for prismatic components, complex aerospace surfaces, and intricate pockets. We specialize in maintaining tight positional tolerances and superior flatness on aluminum, steel, and advanced alloys.
Positional Accuracy
± 0.001"
Precision lathe work for round parts. Our lathe handles everything from simple shafts to bores, grooves and threads with tight concentricity.
Concentricity
≤ 0.0005"
Drilling, reaming, tapping and thread milling so every hole lands on size and position, and every thread engages properly. We choose tooling and parameters for your material and tolerance, so the fit repeats part after part.
Thread Standards
UNC • Metric • NPT
Fast CNC machining for functional prototypes, in the same material as the final part, so you can test fit, form and strength before you order more.
Typical Lead Time
3–5 Days
Production lots with a controlled process and inspection. Ordering the same part every month? We repeat it exactly, with tuned cycle times so it costs you less.
Batch Consistency
Part to part
CNC milling and turning for prismatic and round parts across a wide size range.
3-Axis Milling & Mill-Turn
Tight tolerances, fine finishes and critical assembly dimensions across many materials.
Tight-Tolerance Capability
From 1 prototype to pilot lots and repeat orders, with no minimums.
Prototype → Production
Part isn't standard? Upload your CAD and an engineer will review it.
Machining tolerances and GD&T requirements directly affect cost, lead time, and inspection strategy. Clearly defining critical features ensures manufacturability and predictable results.
| Category | Technical Description | Typical Notes |
|---|---|---|
| Standard Machining Tolerances | General-purpose tolerances (typically ±0.005" or ISO 2768-m) achievable on most CNC milling and turning operations without specialized fixturing. | Specify only critical dimensions to control machining cycle time and costs. |
| Tight & Precision Tolerances | High-precision tolerances down to ±0.001" requiring stable datums, thermal control, and validated metrology inspection for critical fits. | Critical for bearing seats and aerospace components; expect higher production costs. |
| Threads & Precision Tapping | Internal and external threads machined per ASME B1.1 (UNC/UNF) or ISO metric standards, supporting various thread classes (2B/3B). | Call out thread type, class and depth on your drawing. |
| Surface Finish (Ra / Rz) | Surface quality driven by toolpath strategy and RPM optimization. Standard finishes range from Ra 125 down to Ra 32 (3.2 to 0.8 μm). | Specify Ra/Rz only for functional surfaces or cosmetic requirements. |
| Inspection & GD&T Metrology | Dimensional verification of Geometric Dimensioning and Tolerancing (True Position, Parallelism) using calibrated metrology instruments. | Define inspection levels (FAI/AS9102) and reporting requirements in your RFQ. |
We machine a wide selection of metals and engineering plastics. Don’t see your material? Upload your spec and we'll confirm availability and machinability within 24 hours.
Pick a finish for corrosion resistance, wear protection, electrical conductivity or just looks. Need a special specification? Upload your print or finishing spec and we'll confirm if it can be done and when.
Optimizing your CAD data for CNC manufacturing reduces lead times and lowers unit costs. Follow these Design for Manufacturing (DFM) standards for the best results.
| Design Feature | Technical Recommendation |
|---|---|
| Internal Radii & Tool Access | Incorporate internal fillets to match standard end mill diameters. Avoid sharp 90° internal corners; instead, use radii ≥ 10% of pocket depth to reduce tool deflection and chatter. |
| Minimum Wall Thickness | Maintain structural stability with minimum walls of 0.020" (0.5mm) for metals and 0.040" (1.0mm) for plastics to prevent vibration, part deformation, and thin-wall breakthrough. |
| Hole Ratios & Threading | Limit hole depth-to-diameter ratios to 10x or less. For threads, 2x diameter engagement is typically sufficient; deeper threads increase tap breakage risk without adding strength. |
| Undercuts & Side Features | Minimize undercuts requiring specialized lollipop or T-slot cutters. Features reachable in a single setup optimize cycle time and ensure tighter positional tolerances. |
| Setup & Tooling Complexity | Design for 3-axis accessibility using standard tool sizes. Reducing the number of unique setups is the most effective way to lower the total cost-per-part. |
| 2D Drawing & GD&T Checklist | Ensure your print includes critical datums, thread classes (UNC/Metric), surface roughness (Ra), and material certifications to streamline the FAI process. |
Production of high-durability assembly fixtures, inspection jigs, and mold inserts. We utilize stable alloys like Aluminum 5052 and Tool Steels to ensure long-term dimensional integrity in factory environments.
Precision prototypes to validate your design and run tests. Machined from the same engineering plastics and alloys as the final part, so you see how it will perform before producing in volume.
Reliable manufacturing of end-use components. We deliver high-accuracy hardware that meets strict surface finish (Ra) requirements and ISO-standard tolerances for direct assembly integration.
AS9102-ready components requiring extreme strength-to-weight ratios, full material traceability (MTRs), and strict compliance with aerospace-grade GD&T standards.
Complex surgical instruments, biocompatible implants, and diagnostic housings featuring controlled surface finishes and micro-precision tolerances for the medical device industry.
Custom robotics end-effectors, high-cycle industrial hardware, and bespoke sensor mounts designed for high-speed automated systems and precision motion control.
PREMSA Industries makes custom CNC parts: prototypes, pilot lots or production, with no minimums. We do 3-axis milling, CNC turning, mill-turn, and precision drilling and threading, built to your drawing, your material and your inspection needs.
Whether you're testing a new design or reordering a part that already works, at PREMSA you quote online, get manufacturability feedback, and your part is measured against the drawing. Explore each CNC process below, use our calculators for tolerances and tap drills, and request a quote when your CAD is ready. If you are looking for industrial machining in Mexico, we make parts from 1 piece up to production.
PREMSA ecosystem
We make your part in Monterrey and ship it across Mexico and abroad. We do milling, turning, mill-turn and drilling/threading with ISO 2768 tolerances and engineering materials, from 1 prototype to production. Use the technical references below and quote online with STEP or STL files.
3-axis milling for prismatic parts, pockets, and complex multi-face geometry.
View service2-axis and live-tool lathe work for shafts, bores, threads, and rotational features.
View servicePrecision holes, reaming, tapping, and thread milling for assembly-ready features.
View serviceDFM, tolerances, threads, and best practices for CNC-ready CAD.
Read guideCNC machining from our own plant in Nuevo León, from 1 part.
View resourceLook up linear, angular, and geometric ± values by nominal size before specifying CNC tolerances.
View chartCalculate hole diameter for metric, UNC, UNF, and NPT threads in drilled and tapped features.
Open toolReference number, letter, and fractional drill diameters in mm and inches for CNC programming.
View chart