Hi Robin,
Wow, that’s probably more useful information than I have gleaned from memory and reading. Thanks

The overhang scenario is obvious, now you have pointed it out. I had assumed that if the extensions were solidly mounted and flex free, they would become the mount rather than a pivot.
You will probably laugh, when I tell you, that all my parts have been made using a humungous 6” tilt & swivel vice, bought on the premise that mass and solidity were king! …. Clamps from now on.
This leaves me with two problems now, my trunion table with a rotary table on top 170mm min., and the column, as the head will be that much higher.
Incidentally, the head clamping is by 3 large nuts (& bolts) which I tighten with a large ring spanner, so much so in fact that the column is free of grease (copperslip)
and won’t fall or crank, until I wind it up!

I have a fairly extensive range and quantity of HSS cutters (all imp.) so I am happy they will be useful, although I guess I will need a Tool cutter/sharpener in the future.
Are indexable cutters a good idea, I was thinking of buying a face cutter?

I had intended to use Castrol Carecut as my lube, because the heinous stuff we used in the 70s gave me dermatitis, but I have no idea how good it is as a cutting fluid, yet!

Well, lots to be getting on with, Z axis next to make, and I’m looking forward to applying this new found knowledge.
I do not have an angle plate large enough to mount the Z axis bearing block to bore them, so I am going to use the vertical rotary table (truniun mount to be) and find out how solid it is as a mount.

Many thanks for your time and for sharing this knowledge.

Regards
Mark