Hi,
Our team doesn’t have any pneumatics and we are wanting to build a blocker, how should we build the mechanism?
Maybe use a very quick wench with the blocker rubber banded one way or just attach the motor strait onto the place where the blocker pivots but the issue with this is that you cant screw joint it.
Hello! To be able to help you, we need more information–how many watts do you have available, is your robot capable of lifting heavy loads, etc. However, just based on my personal opinion, I like either a dr4b or something like this:
https://www.youtube.com/watch?v=jD-ZuIfMb6A&t=16s (9:20ish)
We have left 22w for elevating or blocking (better if we can do both)
We have used 11w for wings
I wouldn’t be the best to ask, but in my mind, a dr4b with something like this:
and a blocker combined would be best. (2 11w motors to control it)
1 Like
I have been pushing my students to make a blocker using a Chain-Bar mechanism. I have attached a short video by Kepler Robotics that shows how these work. Important to note that you don’t have to put the motor on the middle bar, you can use a gear set and put the motor on the bar that attaches to the robot base.
We used one of these very successfully when I was with team 21222A and the competition involved stacking cubes. They tend to be fast, but not very strong, so for something that just needs to deflect a tri-ball this would be fine, but it would not make a good climber.
The chain-bar is great because the last bar will always stay parallel to its starting orientation as it moves up.
https://www.youtube.com/watch?v=LUvIH5k8HWY
IMO, I recommend you not try and combine the blocker and climber functions into one mechanism. A good blocker will need to extend and then likely needs to be retracted quickly once the need to block is gone. The climber needs more torque, so it will have to run slower. See if you can make a blocker with 2 - 5.5 watt motors, and use the last motor/s for a low speed climber or to operate a mechanism that can allow you to use the drive motors to power a climber.
This topic was automatically closed 365 days after the last reply. New replies are no longer allowed.