New to machining and metal works, can I get a sanity check before I write one

[wrmiller]

Back in the 'old days' you achieved rigidity in machines by pouring more iron casting. Today, with better grades of iron and steel, and better design rules/computer modeling, just more weight is not always better. Weight, in and of itself, does not a more rigid machine make. But I hear the comment made that it does quite often around here. I used to try to educate, but now I just roll my eyes and move on.