simply 34 to get out as quickly as possible 34 in the preferred embodimet the feather edge thread removal operation is completed with a series of 14 passes by the grooving tool after completion of the feather edge thread removal operation the machine automatically proceeds with the final threading pass and finishes the make up standoff the machine then stops and the first side of the coupling 1 is complete imperative to the method of the present invention is a complete inspection of the first side of the coupling 1 and the making of adjustments if it is determined that such adjustments are necessary it is quite likely that adjustments will be necessary on the initial coupling 1 being machined the coupling 1 should be inspected for variance of the following dimensions it is important to realize that the make up standoff groove diameter and groove location must all be correct before an evaluation or adjustment of the feather edge removal operation can be made since this is rarely the case on the first coupling being machined it is the usual case that no adjustment is made to the feather edge removal operation until the second side of the coupling 1 is machined and inspected if such dimensions are not correct then adjustments made to correct these dimensions would necessarily move the location of the feather edge thread making evaluation at this point useless after the adjustments are made to correct any errors in the above mentioned seven critical dimensions the coupling 1 is flipped over and again placed in the chuck of the lathe to begin second side operation when the coupling is replaced in the chuck special attention must be paid to orient the line originally drawn on.