In simplest terms, blade speed on a wood saw is typically higher than a metal saw. Usually a metal saw has a better guide system as well, and the metal saw's blades are of course different--usually with more teeth per inch. You can certainly cut wood with a metal saw in a pinch, as I often have on my little 4x6 cheapie horizontal/vertical metal saw, but doing it a lot leads to problems with sawdust gumming up everything.
 
Some folks will use a jackshaft arrangement to slow down a woodworker bandsaw for cutting metal. As I recall, you need at least a 10:1 reduction.
 
The metal cutting bandsaw is made where the saw blade tightens much tighter. Therefore it doesn't have rubber tires like the wood saw does. The metal saw also runs a lot slower. It often also either doesn't have a saw table or the table is removable so a clamping devise can hold the steel in place while being cut. Some metal saws also have a pump which dispenses oil on the blade to lubricate the cut. You sure wouldn't see that on a wood cutting bandsaw.
 
Our old Delta wood saw can do both. I never tried it on metal as I already have one of those.
 
(quoted from post at 19:28:31 06/08/17) What is the difference between a metal cutting band saw and a wood cutting band saw?

we run a quad band saw mill with 6' wheels and a 40' 15ga band saw. you run metal thru our band and they will blow up. Oh, I work in a southern yellow pine sawmill.

bass
 

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