When an automation equipment customer sent us this project, the specification was already well defined: a custom nesting fixture for their assembly line, designed in-house and to be machined from black delrin per their drawings. The requirements told us why — precise part location, a surface that wouldn’t mar delicate components, electrical insulation, and dimensional stability over thousands of cycles. Our job was straightforward on paper: turn their design into a finished fixture, exactly to print.

The customer’s choice of delrin (POM/acetal) was a sound one — it has earned its place as a go-to material for jigs and fixtures. It machines cleanly, offers high stiffness with low friction, and its minimal moisture absorption means a custom delrin fixture holds its dimensions long-term. Being a plastic, it’s inherently gentle on the components it locates — no scratching, no denting. The black grade brings two practical advantages on top: better UV resistance, and a low-glare surface that works well with machine vision systems on the line.

We machined the fixture from a solid delrin block, starting with roughing of the central channel and stepped nesting pockets, then finishing with sharp carbide end mills — which is where the clean, uniform tool marks across the surface come from. Counterbored holes, precision slots, and locating features were brought to final size in subsequent operations, and every pocket edge received a light chamfer so components load smoothly without catching.

Part type:  Custom Delrin Nesting Fixture for Automation

Material: Black Delrin/POM

Machining Process: 3-axis CNC Machining

Surface Finish: As-Machined

We provide custom CNC machining services for low-volume production and Rapid Prototyping for design verification.  Click Here to Upload Your CAD Files