Coil Winding Nozzles - Ruby Tipped

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Ruby is the Hardest




Ruby and Sapphire are the hardest among the materials selected for coil winding nozzle entrance and exit. Their single crystal (mono crystalline) structure allows diamond polishing to a mirror finish unmatched by other material, reducing friction and protecting the wire.  Shown at left is a photomicrograph of a ruby exit orifice.


Technical Data

          Hardness value: 1,800 – 2,200 Vickers, or 3 times that of case hardened steel


          Surface roughness: 0.025 – 0.05 microns, or 1 – 2 micro inches Ra


          Tip I. D. Choice of  Ø 0.3, 0.5, 0.6, 0.7, 0.8, 1.0, 1.2, 1.4, 1.8 mm


          Outside diameter: 0.5 – 4.0 mm, wall thickness governing


          Length: 10 – 50 mm, aspect ratio governing


          Young's modulus: 190 - 210 MPa


Issues with Ruby Tipped Nozzle

The body of a ruby tipped nozzle is usually made of a stainless steel tube that retains the longitudinal grains inherent to all hard drawn steel tubes, which will form a bulge in the bore when bent then straightened. Upon impact, the ruby tip either will be broken or fractured which may not be visible to the naked eyes but which nevertheless will damage the wire. Therefore, a ruby nozzle after impact should be discarded.


Part Numbers


A 2-section ruby nozzle can best be described by our coil winding nozzle numbering system. A 3-section ruby nozzle needs a dedicated dimensional drawing, of which one representative drawing is depicted in our coil winding nozzle drawings


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