SpinOffs

A blog on what's new, notable, and next in turbomachinery

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Calculating Surface Roughness and Cusp Height for Ball End Mills

By Ryan Lussier, Senior CAM Software Product Manager
Aug 20, 2026

Imagine you're finishing an impeller blade with a ball end mill. The drawing calls for a specific surface finish, but now you need to determine the toolpath parameters that will achieve it. Should...

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Calculating Surface Roughness and Cusp Height for Ball End Mills

Dimitri Deserranno

Reverse-Brayton Cryocoolers

Reverse-Brayton Cryocoolers

By Dimitri Deserranno
Apr 19, 2018

Perhaps it is because Spring is so slow to come this year, but I have been thinking a lot about refrigeration and the different types of systems there are. Refrigeration systems that operate below...

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Compressor Design: Influence of the Impeller Exit Blade Angle

Compressor Design: Influence of the Impeller Exit Blade Angle

By Dimitri Deserranno
Jan 19, 2018

During the compressor design process, one of the key optimization steps is to adjust the impeller exit blade angle with the goal of achieving the desired pressure ratio, efficiency and range. When we...

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