making an EPIC £20000 machine part 4

Part 1-    • Building an EPIC £20,000 machine part 1  
Part 2-    • Building an EPIC £20,000 machine part 2  
Part 3-    • Building a £20,000 Epic machine part 3  
shortened version of first 3 parts-    • 5 months in 40 minutes EPIC £20k wood...  

I was originaly going to save this until I had made a rotary axis, but started editing it to free up some hard drive space and it ended up being an hour long video laready so here is part 4 for you all.
The main goal was to stiffen up the spindle mounting due to some flexing even under fairly light cuts. Doing this also reduced vibration when cutting which should be good for tool life and accuracy.