Why does TPI matter in metal bandsaw blades you ask? Well, using a metal cutting bandsaw can vibrate a lot if you’re not careful. The main cause is the blade teeth hitting the metal when they cut. If the gap between the teeth is bigger than the thickness of the metal, each tooth hits separately instead of continuous contact. This constant ‘banging’ of the teeth on the metal edge causes bad vibrations. It wears down the teeth faster, chips them, gives a crappy finish, and is super loud. Trying to cut too fast with teeth that are too big makes it even worse. You never want the metal you’re cutting…