Precision CNC Turning Services with Custom Solutions

A precision turn is a CNC machining operation that rotates a workpiece while a cutting tool removes material to create cylindrical or conical shapes with extremely tight tolerances—often measured in microns. Precision turning requires calibrated equipment, proper tooling, and verified machine accuracy to consistently achieve specifications. At Sarkinen Calibrating, we ensure turning operations maintain NIST-traceable accuracy to 1.0 parts per million, guaranteeing dimensional reliability for critical components.

We routinely achieve tolerances of ±0.0001" to ±0.0005" on critical dimensions, depending on material, geometry, and feature complexity. Our calibrated equipment is verified to NIST-traceable standards with accuracy to 1.0 parts per million, ensuring machines can reliably hold specified tolerances throughout production runs. We provide detailed inspection documentation that proves conformance to your exact requirements.

Consistency starts with machine calibration. We verify CNC lathe positioning accuracy, repeatability, and axis alignment using Renishaw Laser Interferometer systems before production begins. Throughout the run, we perform in-process monitoring of critical dimensions and maintain detailed process records. This calibration-first approach eliminates hidden machine errors that cause dimensional drift and ensures every part matches the first.

We work with a wide range of materials including aluminum, brass, stainless steel, carbon steel, tool steel, exotic alloys, and engineered plastics. Each material requires optimized cutting parameters, tooling selection, and machine setup to achieve the best surface finish and dimensional accuracy. We evaluate material properties and adjust our process accordingly to deliver superior results regardless of workpiece material.

Yes. For prototypes, we provide rapid turnaround on single parts or small batches to validate designs and prove manufacturability. For production runs, our calibrated equipment and proven processes ensure consistent quality across high volumes. Whether you need one part to test a concept or thousands for ongoing production, we maintain the same rigorous accuracy standards throughout.

Lead times vary based on project complexity, quantity, and current workload. Simple turned parts may be completed within days, while complex components requiring special tooling or materials may take longer. As a local Portland OR and SW Washington provider, we offer faster response times than out-of-area competitors. Contact us with your specifications for an accurate timeline tailored to your project needs.

Yes. We provide comprehensive inspection documentation for all turned components, including dimensional reports that verify conformance to your specifications. Our measurements are performed using calibrated tools traceable to NIST and International Standards, ensuring data accuracy and reliability. This documentation supports your quality records and provides proof that parts meet required tolerances.

Contact us with your part drawings, material specifications, quantity requirements, and desired tolerances. We'll review your requirements, evaluate manufacturability, and provide a detailed quote that includes pricing, lead time, and any recommendations for optimizing your design. We're committed to transparent communication and delivering solutions that meet both your technical and budget requirements.