Yes thats supposed to be 100 %. I find it tends to be a hair shy if your od is close to major diameter. I tend to check my threads b4 i get to recommended depth. Theres a fine line between a tight thread and a lose thread. I also feed straight in when im getting close, taking spring passes also, it really cleans the back side of your threads up. just dont get too ambitious with your depth of cut. Measuring over wires gives a better idea of where your at than just fitting to a nut. In your case, you need to finish bolts first then fit your nut to them. Btw i tried this at work today on our old monarch cw lathe. Caught an even numbered line then an odd numbered line and it worked great. Didnt have time to try making a nut. The undercut really helps on an internal thread. You can leave it a hair shy of 5/8 and fit your nut to the bolt. On the right hand nut its simple. On your left hand you can leave undercut on outside and just ease in with your tool when you get close to depth. back tool out. move bar inside, then feed in. Threading the right hand nut first will give you a better idea of depth and apperance of thread. I do these alot but mine are always acme threads and a larger diameter. I did cut a triple lead thread once and made the nuts for it too. I hope this helps you, Its easier for me to do it than to explain it. Ive been doing this for 27 years, all manual equipment. The cnc stuff is greek to me. I do love the DRO on the lathes and the mills. Thats the newest technology we have. That and insert tools. we used the old carbide single point tools for years. And back then we used all hss for threading, grooving etc. I have quite a selection of hss tool bits i have ground over the years. Btw you can use the cosine of your compound angle to determine how far your actually feeding in. I think the double depth of 11 tpi is .15747 x cos 29.5 (.87035)=.137. 750/11=.06818 thats per side so doubled it would be .1364 so yep its close.
