Two ball screws for my x axis and two motors, do i need two drivers?

[Jonathan]

it's just that they are really tight so I will have to use a rubber mallet ?? is this normal

No, sounds like the end machining for the bearings might be a bit oversize. Don't use a mallet as that will damage the bearings unless you can only hit the inner ring of the bearing... could try heating up the bearing to make it expand a little. It would be best to measure them with a micrometer first just to be safe as you don't want the bearing to get stuck half way.