thanks for the reply huflungdung,just to clarify turned diameter is 1.75 inches,after screwcutting this diameter is reduced to 1.742 inches .Am i calculating the reading correctly,i.e.turned o/d.minus thread depth plus thickness of parallels(.250).i could not get the required reading with the inserts i mentioned,i have since tried using ag60 inserts which seem to work ok.usually we manufacture the female component first then screwcut the male component to suit,however this is a new order and we have no gauges to suit the five different unf threads.this is the first time i have had to make the gauges and i have only used thread parallels once or twice many years ago. |