Thanks Andy & Dean,
Ok, I'll try a few things, in saying that if the file hasn't got a problem as I think Henry was suggesting may be the case, I would have thought that this basic design & start of the design would be handled easily by TC?
I have Multiple Rotors, Shafts, Bearings, Bushes, Housings, Seals, Threaded Holes, Springs, Gears, Gaskets & several other complete mechanisms to add yet, what I have at the moment is about 1/8th of the total drawing or less I would think.
If I have to, I will start over again in a new file & see how it goes, it's no problem & good TC practice.
I have just tried to work on the file just now & it does seem to have an issue, I tried to copy & paste to a new file & it just froze & will not respond again?
Thanks for the help once again.