another hobbed bolt method

Using a drill press, a hand drill and a stack of 5/16″ washers.  It went pretty easily.  I marked the bolt in the extruder body with a sharpie with bearings and washers in place.  I chucked up the bolt and used an abrasive stone to make a 3mm radius recess at the marked location.  I took off the drill press belt to allow the chuck to spin easier then chucked up the bolt with washers up to where I marked the bolt and held the tap chucked in the handrill at 90 deg.  The washers kept the tap from wandering much down the shaft.  A few minutes gets the hobbs to a deep enough cut.

extruderbolthobbing01 extruderbolthobbing03lt

see my video: http://www.youtube.com/watch?v=jSmhUWTSlZE

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