You can disengage the split nut and reengage it at will if you are cutting a thread that is a multiple of the lead screw pitch. Do I dare unlock the half nuts and move back with the carriage then just relock the half nuts? So far for threading, I make a cut and reverse the motor to take the carriage back for the next cut while leaving the half nuts engaged. Do I need this for a 12 TPI cut? I heard a rumor that I don't. I have a Southbend lathe that doesn't have the thread index dial. There is almost no side ward movement with Mauser 98 issue barrels and others having proper fitting 55 degree threads. Such barrels, when screwed part way into the receiver, can usually be moved from side to side somewhat since the threads are not mated perfectly with those in the receiver. While these barrels are not an ideal fit, they are generally serviceable. have threads with 60 degrees included angle. Many Mauser 98 replacement barrels produced in the U.S. All three barrels have 12 threads per inch, and the diameter over the threaded portion is 1.10 inch. Two of these barrels were from model 98 infantry rifles of WW1, and the other was from a carbine 98k barrel produced during WW2. Threads on three German Mauser 98 military barrels were measured with an optical comparator by the American Rifleman technical staff. The V threads on Mauser 98 barrels are of British Whitworth form with a rounded crest and root, and the included angle is 55 degrees, not 60.
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