Blue POM Flared Valve Ring Nozzle, Turn-Mill and 5-Axis Machined, 130 mm Long

About This Part

This nozzle is one of those parts where the geometry, not the material, sets the difficulty. It is a single blue glass filled POM component with four things stacked along one axis: a wide thin wall flared mouth at the bottom, a slender shaft through the middle, three sets of flow fins spaced 120 degrees around that shaft, and a bayonet locking slot with an O-ring groove at the top. Overall length is about 130 mm, the flare is roughly 85.7 mm across (3.375 inches), and the shaft is around 10 mm in diameter.

The proportions are the problem. A 130 mm part carried on a 10 mm shaft will whip and chatter the moment a tool leans on it, and the flare at the end is thin wall, so it wants to deflect as well. Holding concentricity to 0.03 mm or better over that span means supporting the part along its length instead of gripping one end.

The route starts on a turn-mill center. Everything sharing the main axis is cut in one clamping: the flared mouth profile, the external shaft diameters, and the O-ring groove and bayonet slot at the top. Doing them together is what keeps the fins in phase with the locking feature.

The three sets of flow fins come next, finished on a 5-axis machining center so all groups are generated from a single part setup. Indexing around the shaft on a separate fixture would introduce angle error between the groups. After that the central bore is drilled and bored through the full length. A deep bore in plastic tends to wander, which shows up as wall variation and roundness error at the flare, so it is bored as a dedicated finishing pass rather than left inside the roughing.

Finishing is deliberately plain. Every edge is deburred under a microscope, because the fins and the flare edge hold micro flash that would otherwise break loose into the spray path. Then the part is ultrasonically cleaned in pure water and dried at low temperature, so nothing is left inside the fluid channel.