No real progress yet as that will have to wait until I get the controller. I did however buy a Yaskawa spindle motor/drive/transformer that I thought may do for the Chiron, its 6000rpm like the original. It is a big motor and is too big to fit between the cylinders but I reckoned I could modify them and make it fit. I then looked at the weight of the motor and thats when I saw this was not going to be a good idea

It is 90Kg. the original motor is 20Kg and the one I was going to use was about the same.
It is actually about the same physical size as the big servo I have on the big lathes spindle but even that is only 57Kg.
I am not sure what I will do, I have a few options.
I can keep this as a spare for the big lathe, its a bit down on torque but should be enough.
I can put it on the manual lathe (I fitted a servo to it to bypass the noisy headstock) and then put the motor from it on the Chiron.
I could fit it to the manual lathe, put the motor from it on the Beaver and put the motor on the Beaver on the Chiron.
I also have a motor drive I had bought a while ago planning to use it for the manual lathe but although it was bigger it just faulted out with over current, not sure if it is a drive issue or motor issue but also wondering if it was a config issue as it uses a personality module. I have just compared the hex file from the module to one I just generated in the software and there are differences. Only thing is it is a hassle to get the other motor removed and this one all wired and fitted to the manual lathe only to find its the same. I could fit this to the Beaver and see if it looks ok on that but again its a bit of a hassle if its not right.
I will have to decide at some point but at least I have a few options

Hood