Since you are cutting external threads, have you considered that your stock is undersized? If this is not the case they you may need to adjust your program to compensate for the error. Have you contacted your ISCAR supplier or ISCAR directly for technical assistance? As for measuring the threads to confirm the dimensions the best way to do it is to use go/no go gauges. Alternately you can measure the threads over wires. For more information on measuring threads you need to look at the ASME/ANSI standards ASME/ANSI B1.2-1983 Gages And Gaging For Unified Inch Screw Threads ASME/ANSI B1.3-2007 Screw Thread Gaging Systems for Acceptability: Inch and Metric Screw Threads (UN, UNR, UNJ, M, and MJ) These standards will provide you with more information than the summary contained in Machinery's Niel Leon engineering.com
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