Hi!
Designing a cnc router for a school project. The plan is to move the table in the x-direction. Im am currently looking into what kind of bearing i should use for the table. So Im thinking I need to know how much force the drilling will cause on the table so I can chose a bearing that will cover the force applied.
The plan is to cut in aluminum.

The only thing I am interested in is the vertical force when drilling, or is this information something I don't have to pay any attentions to?

Im thinking about using SBR Supported Linear Rails and they should be able to take 375lbs ~ 1.7kN per block. The table weight about 20kg.
I think of a safety factor of 3-4 is good to use. So that gives 1.7kN for the whole table, 4 blocks). Maby it wont be a problem but i kind of need some calculation that prove it as this is a school project.

Appreciate any help in this matter...

What is a normal feed-rate when drilling?

Any suggestion?