I've been obsessively browsing this forum and looking through all your incredible builds. There definitely is some great talent here, as well as sweet machines being made. This has brought up a question...

When designing a machine, specifically a vertical mill, what metric is used for rigidity? For example: if you want to design a mill capable of machining a specified material with a specified material removal rate, how do you go about this? Figuring horsepower required is much more straight forward, but there must be some metric used by commercial machine designers.

Thanks for any help!

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