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f350ca
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Hope I can explain this trick a machinist showed me.
For your 3/4 -16 fine thread, take a 3/8-16 course tap, (damaged if you have one), grind away the teeth on 3 of the 4 flutes, if its not a bottoming tap grind away the end till your into full teeth, leave 2 or 3 teeth at the end then grind away the rest back to the top. Presto you have a full form boring bar.
Greg
For your 3/4 -16 fine thread, take a 3/8-16 course tap, (damaged if you have one), grind away the teeth on 3 of the 4 flutes, if its not a bottoming tap grind away the end till your into full teeth, leave 2 or 3 teeth at the end then grind away the rest back to the top. Presto you have a full form boring bar.
Greg