I have the gauges, well at least a L-1 OD and L-1 and L-3 ID.
Small stuff, 1/8 and 1/4.
Any been there done thats would be appreciated.
You doing this on a lathe, since your talking about single pointing. There is a process for doing it in a mill, with the tool following the lead and the taper. Never done it,looks like a tremendous PIA, only practical on ginormous threads, IMO.
So that leaves us with the subject at hand. I was going to suggest thread milling, but your in a lathe obviously, and not one with live tooling?
What Seymour is trying to communicate is for you to be sure you account for the full Z travel, including your amount that you start from in front of the thread, plus the amount you run past the thread. Programming for only the taper amount(3/4/inch), then moving say .2 longer than the part, in order to start and finish in the clear, would give you an incorrect taper. Bad part is, depending on how much you missed it, you might not notice it with your gauging. Can you say "scrap"?
I like to start my G76 about .1 in front of the part, in order for the machine to have plenty of room to get the lead worked out. Old habit really, from doing this on a manual with a taper attachment. CNC with it's ball screws and encoder can start much closer. How far you run out the ack of the thread is up to you and whether there's a shoulder back there. But with the sizes your talking about, tool length is gonna have a lot to do with it also.
I agree with the idea of tapering the raw hole before you thread it. Sidesteps a lot of problems, again with that tiny tool, you need all the help you can get.
In your G76 cycle, assuming you use the two line version ,the taper is in the R dimension, in the second line. Expressed in a radius. This is where you program the taper in your threads. Just remember to trig out how much taper you need for the full amount of Z travel your tool will encounter, whether it's actually making chips the whole way or not. As you can probably tell, I program this stuff in longhand, with no CAM. We use what we have.