CNC parts from technical drawings: from design to delivery
What does manufacturing CNC parts to drawing mean?
Manufacturing CNC parts to drawing involves producing metal components according to the dimensional specifications, tolerances and finishes defined in a technical drawing supplied by the customer. The manufacturer receives the design — in 2D/3D CAD format or as a PDF drawing — and takes responsibility for the entire production chain: programming, material selection, machining, inspection and delivery.
This is the most common subcontracting model in industry: the customer designs, the manufacturer produces. The key lies in the manufacturer having the technical capability to interpret the drawing correctly, select the optimal process and guarantee the specified tolerances.
At MECVIL, we have been manufacturing CNC parts to drawing for over 50 years, with the capacity to handle everything from precision components to structures of up to 20 metres. Our machinery park includes CNC milling centres, CNC lathes, grinding machines, 5-axis machining centres and wire EDM equipment.
The process: from drawing reception to finished part
Manufacturing CNC parts to drawing follows a structured workflow in 7 stages:
- 1.Drawing reception and analysis: review of dimensions, tolerances ([ISO 2768](/en/noticias/mecanizado-precision-tolerancias)), surface finishes (Ra), specified material and quantity. If the drawing contains ambiguities, we consult with the customer before proceeding.
- 1.Material procurement: selection and purchase of raw material (bar, block, plate, casting) according to the grade specified on the drawing. We verify material certificates before machining.
- 1.CAM programming: the programmer translates the 3D drawing into optimised toolpaths for the selected CNC machining centre. Roughing, semi-finishing and finishing strategies are defined.
- 1.CNC machining: execution of the program on the machine. This may include milling, turning, grinding, threading and finishing operations, in one or more set-ups depending on the complexity.
- 1.Treatments: if specified on the drawing, the part undergoes heat treatment (hardening, tempering, case hardening), surface treatment (anodising, chrome plating, galvanising) or coatings.
- 1.Dimensional inspection: measurement using coordinate measuring machines (CMM) for all toleranced dimensions. Generation of a dimensional report with traceability under our ISO 9001 quality system.
- 1.Packaging and delivery: protection appropriate to the material and dimensions, with technical documentation (dimensional report, material certificate, declaration of conformity where applicable).
Have you got CNC part drawings that need manufacturing?
Send us your drawings and we will provide a detailed quotation with delivery lead time.
What information should the drawing contain?
A complete drawing for CNC part manufacture should include:
- Material: standardised designation (for example: C45, 42CrMo4, aluminium 6061-T6, AISI 316L)
- Dimensions with tolerances: critical dimensions must carry a specific tolerance; all others are governed by the general tolerance indicated in the title block (typically ISO 2768-mK)
- Surface finish: Ra indication on functional surfaces in accordance with ISO 1302
- Treatments: heat treatments (target HRC hardness) and surface treatments (type, thickness)
- 3D format: STEP, IGES or Parasolid. The 3D model allows direct CAM programming without the need to recreate the geometry
If the drawing does not include any of these elements, our engineering team can complete the specifications in collaboration with the customer.
Types of CNC parts we manufacture
At MECVIL, we manufacture CNC parts to drawing across the full range of complexity and dimensions:
By geometry
- Prismatic parts: housings, plates, beds, frames — machined on CNC milling centres
- Cylindrical parts: shafts, bushings, flanges, fittings — manufactured on CNC lathes
- Complex parts: 3D surfaces, recesses, cavities — requiring 5-axis machining
- Large parts: components up to 20 metres on fixed-bed milling machines — our speciality in large-format machining
By volume
- Prototypes and one-offs: individual parts for validation or spares. Direct CNC programming without special tooling
- Short runs (1–50 units): set-up optimisation to reduce cost per part
- Medium runs (50–500 units): dedicated fixturing, optimised cycles
- Repeat production: stored programs for call-off orders, with statistical process control
What materials do we machine?
Our workshop works with all the metallic materials commonly used in industry:
- Carbon steels: C45, S235, S355 — for structural components and tooling
- Alloy steels: 42CrMo4, 34CrNiMo6 — for shafts, gears and high-strength parts
- Stainless steel: AISI 304, 316L, 17-4 PH — for the food, pharmaceutical and chemical industries
- [Aluminium](/en/servicios/mecanizado/mecanizado-aluminio): 6061-T6, 7075 — for aerospace, rail and electronics
- Titanium: Ti-6Al-4V — for aerospace and medical applications
- Cast iron: grey, ductile, nodular — for beds and machine bodies
- Engineering plastics: POM, PEEK, nylon — for insulators, guides and lightweight components
Cutting parameters and tooling are adapted to each material to achieve the best balance between surface finish, precision and cost.
Criteria for choosing a CNC parts manufacturer
When looking for a manufacturing partner for CNC parts to drawing, consider the following:
- Dimensional capacity: can they manufacture everything from small parts to large-format components?
- Process range: milling, turning, grinding, EDM, welding — the more processes the manufacturer covers, the less coordination you need with third parties
- Certifications: ISO 9001 for quality and traceability, EN 1090 for metal structures
- Dimensional control: do they have coordinate measuring machines (CMM) and produce dimensional reports with traceability?
- Service integration: a manufacturer that also offers engineering, assembly and automation can manage turnkey projects beyond the individual part
At MECVIL, our CNC machining service is backed by over 10,500 m² of facilities, +110 professionals and the ability to integrate the part into a 360° turnkey project when the customer needs it. We apply lean manufacturing principles to optimise set-up times and reduce cost per part without compromising quality.
Need CNC parts manufactured to drawing with guaranteed quality?
At MECVIL, we machine parts of any size, material and complexity with coordinate measuring and ISO 9001 reports. Contact our technical team.