What does tac mean in the game?

I don't know if you are talking about CNC tools;

If you are talking about numerical control tools;

I think you may have written the letters backwards.

Personally, I think it should be ATC tool;

In the field of numerical control, ATC generally refers to automatic tool change;

Therefore, ATC tool generally refers to the tool that can realize automatic tool change;

ATC automatic tool changing wall has a maximum tool changing weight, beyond which automatic tool changing cannot be realized.