ODM Precision Turned Parts Service & Products

Conventional CNC lathes hold the workpiece stationary in a chuck or collet while cutting tools feed along the Z-axis. As the part extends farther out, cutting force causes deflection, limiting the length-to-diameter ratio (L/D) to approximately 3:1 or 4:1 without steady rests.

Swiss-type automatic lathes feed the bar stock through a sliding guide bushing past stationary cutting tools. The cutting force is absorbed directly adjacent to the guide bushing, allowing for extreme length-to-diameter ratios (exceeding 20:1) with zero chatter and sub-micron accuracy on long slender shafts, pins, and capillary components.

Micro-burrs on cross-drilled oil holes, internal thread transitions, and sealing o-ring grooves are eliminated using a multi-tier approach. First, tool path programming utilizes customized high-speed peck-drilling retract paths to cleanly shearing chip roots. Second, components undergo high-pressure waterjet deburring (up to 700 bar), cryogenic tumbling for polymers, or Thermal Energy Method (TEM) deburring where explosive gas mixtures vaporize burrs in milliseconds without affecting dimensional tolerances.

Standard turned finishes directly off the machine reach Ra 0.8 to 1.6 µm. Utilizing specialized diamond burnishing, wiper geometry carbide inserts, or high-speed live grinding spindles on turned parts allows us to achieve Ra 0.2 µm on metals like stainless steel and brass directly on the lathe. Secondary operations such as electropolishing, magnetic abrasive polishing, or centerless grinding can further drop surface roughness down to Ra 0.05 to 0.1 µm for medical fluidic interfaces and optical lens housings.

Data privacy and IP protection are foundational to our enterprise partnerships. Prior to receiving 2D PDF or 3D STEP/IGES CAD files, we execute a legally binding bilateral Non-Disclosure Agreement (NDA). All engineering files are hosted on encrypted internal servers with strict role-based access control. Drawings are never outsourced to third-party brokers; all DFM analysis and tooling setup calculations are performed entirely by in-house Sunmy manufacturing engineers.

Every new turned part program follows a rigorous APQP (Advanced Product Quality Planning) workflow. We first produce a First Article Inspection (FAI) sample batch (typically 5 to 10 pieces). These parts undergo 100% CMM dimensional verification, material hardness testing, surface profile measurement, and salt spray corrosion testing if plated. Mass production only commences upon formal customer sign-off of the FAI report and ballooned drawing documentation.