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How can I drill through 1/4" hardened ,galvanized steel?
I have tried some dewalt hss bits but they only blunt,The hole needs to be 6mm diameter,thanks
Make sure you OIL the cutting. Few things wear a drill bit faster than trying to "dry drill" hard metal, especially at high speeds, but a lot of beginners do this. Use a powerful drill, pressure, steady speed (no, you don't want HIGH rpm, drilling is a CUTTING action, not a grinding one), and adequate lubrication. If long chips spiral out, you're doing good. If you're getting powder, you're ruining your bit, and you might not even finish drilling through.
For extra hard steel (I can't imagine GALVANIZED super-hard metal), use tungsten carbide bits. You might be able to get them at the hardware store, but you might have to ask where to find them. You'll have better luck at shops specializing machine shop supplies.
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