I bought 10/14 and a 28 TPI classes for mine, but the 28 is all I ever use. If I had to do a lot of cutting of thick stock I have the coarser blade.Like I said, even with bi-metal blades and the appropriate tooth count the blade speed is about 10 times to fast for cutting hard metals...plan to build a double jack-shaft for the one I use for metal when I retire.
I did add a jack shaft to slow it down, and it's powered by a treadmill motor with a variable pitch pulley so I have some adjustment. I can vary it between about 350-1100
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