Hi,
you need to do the calculations, you are as you said electrically inclined not mechanically inclined.....me too as it turns out, but if you're going to do this then you
need to put numbers to it.

Just as an aside my mill weighs 800kg. The cast iron axis beds alone weigh 115kg each.

What pitch is your ballscrew?

A 5mm pitch ballscrew can support 1250N (125kgf) with 1Nm applied. Note that this is NOT diameter dependent, it depends on pitch alone.

With that in mind your rated servo torque of 2.4Nm can support 3kN or 300kgf.

So now actually work out or measure the combined weight of the X and Y axes....are they 300kg ....or more....or less?

Craig