A 0.1 mm bore nozzle guide                        A digitally monitored radii                          An invisible bulge in a SST nozzle

Coil Winding Nozzle Introduction

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A bore diameter of 0.1 mm is now a routine at COSMOS. This is what the state-of-the-art miniature coil winders demand and to which we answered with a Solid Tungsten Carbide nozzle of a Diamond Polished Bore of 0.1 mm plus precise radius.

Precise Radii

In unison with the trend to miniaturize, the tolerance of the bore radii has become even tighter.  Upon request, our nozzle department will accompany each shipment with a quality assurance report that registers the radius dimension of each nozzle based upon which the customer may select at random to bisect and inspect digitally, to verify what we reported, shown at top middle.

Why Tungsten Carbide and not steel?

Isn't a carbon or stainless steel nozzle cheaper and capable of being salvaged when bent?

Answer: The choice of the nozzle material is a matter of the manufacturing philosophy. Many nozzle makers claim that a steel nozzle is cheaper, can also be mirror finished plus they do not break on impact and can always be salvaged for reuse.

The truths are:

1. You need to examine the bore surface under a microscope to see the true picture
2. A salvaged steel nozzle creates insulation layer damages, which leads to catastrophic consequences

The photo microscopic image at top right may be of reference value. This is a stainless steel nozzle, bent and salvaged.

Upon cut-away and examination under a microscope, a bulge is revealed at the point where the nozzle was bent. Wire insulation is impaired by the bulge and may go undetected, only to manifest itself years after the coil has been put into service, resulting in millions of recalls and replacements.

The bore surface in the photo reveals the inherent nature of all hard-drawn ferrous tubes, where steel grains line up in the direction of drawing, creating a rough texture that is difficult to level.

The cost of Tungsten Carbide Nozzle is 2 - 3 times that of the steel nozzle. The choice is yours.

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