I've got a pretty good start on using Dolphin CAM for my lathe turning project, but I'm having some confusion about the threading.

So I define the start and end points, I take it X stays the same (unless it's a tapered thread) as I don't need to calculate the depth the threads are going to take up?

Next it lists TPI, is this threads per inch or turns per inch? It seems as though I can select one value either Lead, Pitch or TPI, which should I be using?

Also where do I find specs for different threads? I have a program called ME Consultant by Mike Rainey and it gives a ton of different specs but I have no idea what I'm looking at, plus they don't as high as I need. Basically I need to know how deep the threads are for a metric thread 45mm? Also what is the depth of cut on a 16ER triangle style insert? I've looked everywhere I even downloaded Iscar and Kenmetal's catalogs and it mentions nothing about depth of cut. Can a 16ER insert do metric threads?