Originally Posted by
uawgmsmco
My old man has a ton of tubular steel sitting in his shed that he's not using, and I was SO close to designing my machine with what he had.....but the issues you're having with achieving/finding good datum points are why I steered the other way. My machine will be all MDF, which definitely has it's disadvantage versuses steel, but I know I can make saw cuts that are straighter/flatter than some of that cold-drawn tubing. I wish you luck in that area...I saw myself getting way too frustrated with it so I turned away.
As far as any ringing issues....I had a thought on my build....I was thinking about filling any open cavities I could with that "Great Stuff" expanding foam from home depot. It dries to a decent density...not super hard, not super soft, and I'm really thinkin' it could help with some resonance issues.