Passive Claw Rotator?

Our robot looks faintly something like this (excuse the bad drawing):
29 PM
The black scribble right now is a motor, but is there a way to make it so there’s no motor but makes the claw still always perpendicular to the ground?

Put a straight bar like how you have the main “towers”. The bar will always be perpendicular to the floor.

Maybe im Missing something, but shouldn’t the dr4b keep the claw straight all the time?

This shouldn’t really be in ROBOTC tech support category. I would change it. What you’ve drawn looks like a double reverse 4 bar. In that case, the claw should stay perpendicular to the ground, as long as it is connected to the top 4 bar. This image that I found on the web illustrates that rather nicely.


If you want a more mathy approach, the double reverse four bar is essentially two connected parallelograms. In a parallelogram, the opposite sides are parallel.


ohhhh so no lock plate attaching to the arm?

Since the 4-Bar is in the shape of a parallelogram, the vertical bar and anything attached to it will stay perpendicular to the ground.