Prototype Machined Parts

Our prototype CNC services run on the same types of bar-fed lathes, Swiss CNC machines, and vertical machining centers used for production runs. Dedicated scheduling capacity helps us accommodate prototype and short-run orders, with typical lead times of one to three weeks for many turned and milled components.

Prototype CNC Turning and Prototype Turned Parts

Prototype CNC turning at RPM covers Swiss CNC work (20mm–38mm), bar-fed lathes up to 3.2″ in diameter, and chucked parts up to 25.5″ in diameter. That range supports prototype turned parts from small precision components to larger chucked parts, in single pieces or short runs.

Prototype Milling and Multi-Axis Machining

For milled housings and other prismatic components, RPM offers 3-, 4-, and 5-axis vertical milling with a work envelope up to 20″ × 50″. Programs that need both turned components and milled parts can be handled in one facility, which reduces supplier handoffs and simplifies scheduling.

Prototype CNC Services for Single-Piece and Short-Run Orders

RPM accepts single-piece and short-run prototype orders with no minimum quantity. Whether you need one part for a design review or a small batch for functional testing, we can quote prototype CNC machining parts to your drawing and keep production requirements in view from the start.

Material Selection

We machine prototypes from production-grade bar stock and plate available in prototype quantities. Available metals include steel, stainless steel, alloy steel, brass, aluminum, copper, bronze, titanium, and zinc. Whenever possible, specify the material you intend to use in production. That way CNC prototype parts give you test results that carry over to the production component.

Drawing and File Requirements

For the most accurate quote, send a dimensioned 2D drawing (PDF, DXF, or DWG) along with a 3D model (STEP or IGES) if you have one. Helpful details include:

1. Material and grade
2. Quantity
3. Critical dimensions and tolerances
4. Surface finish and any coating or finishing requirements
5. Intended application or mating components, if you can share them

Tolerances and Manufacturability

Precision prototype machining for metal components with demanding dimensional requirements starts with a clear drawing. Tolerances affect cost and lead time, so call out the features that drive fit and function rather than tightening the entire part. Thin walls, deep pockets, and long, slender turned features can add machining complexity. A drawing review before cutting begins helps surface these issues early.

When comparing a prototype machine shop, consider:

• Equipment range: do the shop’s turning and milling capacities match your part size and geometry?
• Quality system: is the shop certified? RPM is ISO 9001:2015 certified.
• Quote speed and clarity: how quickly will you hear back, and what information do they need?
• Engineering feedback: will they review your drawing for manufacturability?
• Production path: can the shop continue with you after the prototype is approved?

Once your prototype is approved, RPM can help you transition into bridge production and full-scale manufacturing. Keeping one machining partner from first article through production offers practical benefits:

• Fewer supplier handoffs, which reduces re-quoting and re-explaining your drawing at each stage.
• Retained process knowledge: what we learn about your part’s material, features, and tolerances during prototyping informs production planning.
• A consistent quality system across every phase under our ISO 9001:2015 certification.

Phase 1: Prototype Machining (1–25 Parts) Produce initial parts for design validation, dimensional inspection, fit testing, and functional evaluation.

Phase 2: Bridge Production Continue with approved parts in intermediate quantities while you finalize demand, assembly, or launch plans, using the same machining processes proven during prototyping.

Phase 3: Full Production (1,000+ Parts) Scale approved components into production quantities using established machining processes and quality controls.

Each phase is supported by our precision machining capabilities and production-focused approach, with process continuity maintained wherever applicable.