Originally Posted by
Ryan J Carpenter
Some things to extract from an engineering side that are getting a little obscured. 1) steel is much stronger than iron - which means that a pound of steel can be the the same tensile strength as 1-5+ pounds of iron depending on chemistry and heat treat. 2) both iron and steel are expensive and the newer companies spend quite a bit of time rearranging the material to reduce material cost while still giving strength to meet their tension goals (likely less than old iron machines where engineers were not trying to save every pound to be globally competitive or avoid shipping cost).
3) There are many ways to reduce vibration and having a heavy machine (steel or iron) is one one of the easiest as it is hard to perturb a heavy mass. Something an old machine will give you that the current woodworking market doesn't demand from new machines.