Building a rack is a very important skill during competitions. You should try to build one, learn how to use it and have it as a tool for you next robots. But for this particular BoxRobot, we will not continue with a rack.
Using the rack depends on the experience of the team. Based on this a different number of gear wheels and racks would be used.
Build a rack and try to lift the robot with this rack.
The next step of lifting a robot to a mission model is to try to use a rack.
Let us do a quick recap of the whole lifting mission and its solution
Need to transfer circular into a linear motion. You need a rack. Here is an attachment with a rack for our box robot.