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Mechanical Engineering

University of New Mexico

2011

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Gauge Repeatability And Reproducibility Study On A Hemi-Shell With A Brown & Sharpe® Coordinate Measuring Machine (U), Lucas Valdez Aug 2011

Gauge Repeatability And Reproducibility Study On A Hemi-Shell With A Brown & Sharpe® Coordinate Measuring Machine (U), Lucas Valdez

Mechanical Engineering Student Publications

In engineering at LANL, everything relies on the quality of a product or process. Today dimensional inspection is a necessity to ensure customer specifications are met to the highest standard. Currently LANL’s main processes for dimensional inspection on hemi-shells are conducted on uniquely designed machines - Sheffield or Shell Measuring Machine (SMM). These specialized rotary contour machines were built to measure only the wall thickness, inner and outer contours of a hemi-shell. These machines are heavily dependent on the inspector and typically have very few personnel trained to use them. With no manufacturer support and age leading to production down ...


Packaging Strategy For High Voltage And High Shock Environments, Kevin Austin Aug 2011

Packaging Strategy For High Voltage And High Shock Environments, Kevin Austin

Mechanical Engineering Student Publications

The historical design approach for ensuring survivability in devices that operate at high voltages which would arc in air or that must survive substantial shock loadings employs an encapsulant whose dielectric strength prevents electrical breakdown and whose modulus prevents gross movement of the embedded components. While mostly successful, this approach presents some significant design challenges: (1) the high thermal expansion of the epoxy leads to large stresses during thermal cycles, (2) degassing of the epoxy before cure and careful encapsulation are essential to eliminate voids that could initiate dielectric breakdown, (3) the internal components are embedded deep within an impenetrable ...