buttress
I have alway's set the compound at 45.Then take your flat,5,7 and add the 45. Then grind your tool 1 degree less than the sum of the angles. Then set the flat ,5,7 to it's proper location.Set # thread's per inch.Note the tool will only cut on the advancing face as it goes down the 45.That's the way I do it.
jim
Put a flat on the tool to match the flat on the male thread.