Unless you have a metric lathe (with a metric leadscrew) you cannot use
the thread chasing dial

On an imperial machine (with an imperial leadscrew) when threadding a
metric pitch,diametrial pitch,module, or inch pitch, once you engage
the half-nut, you must leave it engaged. You will have to reverse the
lathe and pull your tool out at the end of the thread.

inch pitch is different from threads per inch don't get them confused.
your thread chasing dial is only good for TPI settings.

If you are threading a nut right through you shoud have an easy time,
if it's a blind hole, you are gonna have a hard time with it.

hope this helps
-S