I present my too step drill.
Turn and drill steel in round bloc and file the groove use air grinder tools.
And oil quenching.
finish manual sharpening.
For good result in mild steel with a slow rotation and abundant lubrication.
Thanks and sorry for my bad english.
kbalch (Jan 3, 2014)
Thanks glockart! I've added your Two Step Drill Bit to our Metalworking and Machining categories, as well as to your builder page: glockart's Homemade Tools. Your receipt:
Two Step Drill Bit by glockart
drill bit, countersink
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