Ok here is a threading question for you smart guys. I am cutting a pipe thread on a mid 80's super slant with the general numeric controller. Here is the problem. I am cutting 2 threads on this part to begin with. I start by turing a 1.230 lenghth for 7/16 20 threads. I am tryin to do this end first because it has a spec taper on the very end. Between the two threads there is a .100 sholder also. So I am trying to cut the pipe thread in reverse so speak. The program looks like this. G00 z-1.850 x.185; G76 x.200 z-1.550 I K.02963 E .03703 D01196 A30. I am missing the page in the manual that tells me what every thing means. I tried calling tech support a million times and nevr got through. Any help would be great not sure what the I is for.