That's a great point. With that in mind, is there any point at all in getting a dog plate? I already have a 14" face plate. A dog plate adds nothing if I'm not using (or can't use for the reason you gave) the spindle ID taper, right?
Grab one - or more - if you find it cheap, used-but-good. As they sometimes are.. because most of us do NOT use them!
OTOH, I still have - or HAVE had - easily six or seven in D1-3 that had some other plate, fixture, post, mandrel, threaded post - wotever - mounted
to a dog-driver to re-purpose it as a cheap and available backplate or holder for some bespoke tooling or tasking.
Mind, D1-
IS cheaper as well as smaller in -3 and -4 than in -6. No need to overdo it.
As to a jarno DC? Yes, you should have at least ONE "real one" and of good grade, if only as a lower-cost than "test bar" means of confirming that you have succeeded in cleaning-up dings and burrs in your spindle's taper-bore.
Which is a sore tedious, but worthwhile exercise, given it is a handy reference surface, and one of the "proper" ones, whether you actually
work off it much .. or never.
Vetting with a DC is not as handy as with a test bar to run a DI off of, and lacks the "multiplier" effect of vetting further out on the bar. But it's cheaper, and yah don't really NEED the test bar as much - if even at all.
