Author Archives: JVDB

Rotary vacuum mixer design

Just modelling a rotary feedthrough for my vacuum lid using off the shelf items. Did not test whether the “reversed”  rotary shaft seal will hold the vacuum. It consists of: 10mm ground shaft with machined groove for circlip / e-clip 61900-2RS1 – Single Row Deep Groove Ball Bearing. 22x10x6mm Standard rotary shaft seal 10 x 19 x

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Rocket ethics

“Go for the solution that looks easiest, with almost no regard for performance. It will turn out not to be easy, but if you lowballed your expectations enough, you might actually succeed in making it fly, instead of winding up with a failed and abandoned project.” – John Carmack, Armadillo Aerospace