I have converted the same exact casting. You didn't show the Z ballnut mount and I can tell you that this is very tricky to get correctly. There are two reasons for this, first there is quite a distance from the Z carriage (where the ballnut mount goes) to the Z ballscrew axis and this leverage will give you backlash issues if you don't secure the ballnut mount correctly. On my machine I had to grow a bit vertically the z bs nut mount so that 1) it will not deflect for sure 2) spans in bigger vertical distance so minimize leverage. Additionally the the machining in the casting where the mount goes is at least terrible so you will get some rocking there. Before you assemble everything TEST FOR BACKLASH as much as you can.
Good job. You get my sub. I'm soon going to go through the exact same process.
I have converted the same exact casting. You didn't show the Z ballnut mount and I can tell you that this is very tricky to get correctly. There are two reasons for this, first there is quite a distance from the Z carriage (where the ballnut mount goes) to the Z ballscrew axis and this leverage will give you backlash issues if you don't secure the ballnut mount correctly. On my machine I had to grow a bit vertically the z bs nut mount so that 1) it will not deflect for sure 2) spans in bigger vertical distance so minimize leverage. Additionally the the machining in the casting where the mount goes is at least terrible so you will get some rocking there. Before you assemble everything TEST FOR BACKLASH as much as you can.
Have a look at 15.00min , ballscrew adapter clearly shown - we use none of the original leadnut mounting.