I believe he’s talking about a db4 tray hybrid, where you don’t lift the tray itself.
you can also have a tilter mounted to the chassis with the tray on the lift. the tilter pushes the tray forward by rubbing against a flat surface, like some polycarb. it allows you to lift a lot faster because the tilter weighs quite a lot. 6627x does this kind of dr4b tray, it works quite well.
Ngl, I don’t understand how 6627x thing is supposed to work. So, are they pushing tilter vertical while the lift is down and then lift dr4b up? Aren’t they risking the tilter falling back if the robot starts moving or am I missing something?
Then for a goofy, why would anyone want to go to all the extra effort to build a differential if they could use just one motor to lift the arm if it goes one way, and move the tilter, if it turns another?
So basically the tray isn’t connected to the tilter. The tilter is just a paddle thing that rubs the tray. When they lift the tray just falls back to resting position.