Thanks everyone! Lots of great suggestions, I particularly liked the reverse z component, but all very useful, (I tried using camara but not got the hang of it yet)
Anyway, I managed to rotate and confirm that the 3d subtract had NOT worked as it should so that problem still rampant!
I have a couple of new ideas to test, I will comment.
Another TCAD re-install is looming up,,,,,,,
PS I have tidied the model up a bit, removing construction lines etc so I have included the latest file
REM removing the cylinder from the cone, does NOT leave a cylindrical hole, just a hollow conical shell, please give it a go.
If it works for you, it may be my installation..?
Best wishes, Jim
Using TurboCAD 2019 Deluxe 64 bit since Dec 2019
Best is the enemy of good enough
Barrs Law Of Recursive Futility
If you are smart enough to use one of these...
,,, you can probably manage without one!