Newbie Setting the "X"

What kind of tool holder do you have?

OK, just checking to see what sort of idea would work best.

With a fully-manual tool holder you probably want to just use G54 (coordinate system) offsets all the time. For Z you can do this with a dowel pin, put the tool less than the pin dia from the end of the work then jog away until the pin slips through the gap.

X is probably best done with a touch then test cut method (very much like you would with a manual).

A quick-change toolholder might be a good investment, you are losing much of the advantage of CNC with that tool holder.
This is cute, but not what you would call cheap: www.ebay.co.uk/itm/152123879598

I don't know why the tool-point goes to zero if the DRO says not-zero. That's very strange, I have never seen it.

Muzzer wrote:

These are also Chinese but a better price and nicely made. Also less of a weirdo than that German guy in my experience!
I have an "A" set - very nice.

Yes, I have the A set too, from Create Tool. Very nice company to work with, "Nina" responds promptly to emails. I bought some blank holders from them for special purposes (just the serrations and height adjustment, unhardened)

However I get the impression from that tool post clamp that this is a very tiny lathe being talked about,