Hi! My lift it’s a six bar, which works perfectly, but it raises with a lot of problem then, the robot falls forward o back. For solve this problem, I’ve thought to put more weight, but is not enough. But, I can’t reduce the motor power neither, because I need this power to hold two cubes. Then, does anybody know a good way to solve this problem.
I would put the small green wheels (not sure what size), and stack them on the front corners of your robot. That might not be practical, but without pictures of your whole robot that’s where I would recommend them. They counteract the tipping of the lift when it’s up.
We created a linear arm that incorporated a rack and pinion to extend up to about 54" vertically. Needless to say, it was top heavy and constantly tried to fall backwards.
We thought about adding extra weight, but instead we added the tiny Omniwheels behind the pivot point of the robot, that were left about 1/2" off the ground. When the robot tried to tip, it fell back to the wheels and stopped tipping over. It’s pretty much a simple implementation of a wheelie bar.
In your case, add the wheels behind the tower mounted to your chassis- definitely think it would help!
Most six and eight bars are going to be tippy, that is just how it is. Because you’re bring the intake and cubes forward and then vertical a lot of the weight on the robot goes forward causing leaning and tipping. This makes you tip forward and back (depending on how fast the lift gets to maximum height) as you said. The best ways to minimize this is to add weight to the back, and use wheelie bars. Your best bet would be wheelie bars because you already added weight. As I said before, basically whatever you do the robot will still tip. You just have to do your best to minimize it. (also elastics might help if you don’t have them already)