How to make a hobbed bolt using a drill press and M4 tap. If you don't have a grinder, you can chuck the bolt in the drill press and use a dremel tool to cut the groove. The groove gives the tap something to bite into. Please pardon the focus hunting and lighting -- first video with the DSLR... Tools: Ryobi DP120 12“ benchtop drill press, Central Machinery (Harbor Freight) 8“ Bench Grinder, M4 tap, cutting oil, two 608 bearings. The drill press was set to 450 RPM. Music: “Me Robo El
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