I hadnt posted any update as I am having issues fitting the rails, I had everything installed GT2 pulleys and belts motors, print head, but could not get smooth motion, I printed out various rail calibration tools, on my Davinci but still no good, then I realised two of my rails were slightly bent!
I had ordered 8mm ground bearing steel linear rails from a cnc supplier on ebay and just asumed they were streight,
So I stripped it again ordered new rails this time advertised as 3D printer chrome steel smooth rail from a 3D printing parts supplier, only to find one of those were slightly bent also !
In the meantime I found another stockist in UK worldofcnc.com who will supply rails to exact dimensions (others were 400mm lengths and needed cutting down) so I had ordered full set from them 12, 8 & 6 and they all came nicely oilded, perfectly round & correct lengths, so I know where I will be buying in future.
As I re-assembled everything I also noticed a slight wobble in one of the GT2 pulleys so next job was to fit an offcut of a shaft in the lathe and check each one, luckily I bought extras as out of the 20 I bought only 12 were perfectly true.
Also swapped out the 688RS bearings I had fitted (all had at time) for the better 688ZZ as metal shields have less friction than rubber seals.
Hope to get it all setup again today.