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For questions about words, phrases and definitions that are specific to engineering.

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What do I call this shaft that drives the rubber stopper into the glass vial in a vial stopp...

A camshaft is rotating a cam that is part of the shaft. It seems the cam acts on a roller, fixed on a push-rod, and so pushes down the push-rod in the guider. I think the push-rod pushes the rubber do …
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