After trying for way too long I found out that the Puma230MSB can't thread mill along the Z axis because it has no Y axis. Trying to use g12.1 gives me a plane selection error. There has to be a way to get around this because I need to thread soft nylon and single pointing only makes a mess of it.

I'm using a Z live tool drive and can easily take the cut in one pass but how do I calculate the feed rate for 18TPI?