I suggest people swap out the wheels for the charging station. The blue nitrile and black neoprene have pretty bad traction on lexan.
This ramp looks pretty mild compared to 2006’s ramp.
or maybe 2010
If Bomb Squad could use a swerve for 2016, then I’m sure it’ll be fine for the Charging Station.
Suggestions? Looking at McMaster… Maybe the SBR rubber would work better? I’m not even sure I’m on the right type of product actually - just did a quick search. Anyone have knowledge of good tread for poycarb? McMaster-Carr
I will continue to link this thread wherever relevant to the ends of the Earth.
The bumpers can also be 4.5" for another 1/2" of clearance.
To be clear, the ramp in that picture is at the 11deg situation, correct? Not the balanced situation?
has anyone tested swerve on a ramp yet? currious if there are some early results
I feel like it’s worth backing up to ask what the skeptics think would be the issue with a swerve drive climbing the ramp. In particular, what disadvantages do you imagine it could have compared to a WCD, for instance? At a minimum, you can lock the wheels to point the same direction and get the same effect as a WCD with four traction wheels engaged with the floor. The breakover angle is worse with no wheels near the center of the frame, but in normal operation that shouldn’t come into play. With the greater ground clearance that swerve typically allows, the approach and departure angles should actually be better than basically any other standard drivetrain.
Exactly what situation is someone imagining in which a swerve is less suited to navigate the charge station than a comparable alternative drivetrain?
The diagram is only correct if the robot enters the ramp while it’s already down. If it’s not down yet, the grey line is at a 30+ degree angle, not 11.
The real question is how swerve would be affected by the broken cubes.
Yes, 11 deg
I am not sure what tread is best for polycarbonate, but our team plans to do some prototyping on this very topic.
We tested MKi4’s going up 15 degrees on top of lexan today.
well, once you start to move up the ramp, it will almost immediately tip towards you, so I think this drawing is still representative. Only difficult part would be when you have teammates on the platform already, and then some momentum might be necessary. However from tests that some teams have completed, it looks like it won’t be much of a problem at all
Here’s the Ri3D Redux testing with MK4i swerve both with and without bumpers on the charging station: Charging Station Swerve Drive Testing and Construction Ri3D Redux 2023 - YouTube
2010 Robonauts reveal vibes
interesting that they had so much trouble, it seemed like the bumpers didn’t affect it at all either, it was all the frame height. I wonder why this results was so different from 3075’s test. Possible that RI3D redux’s model has too much of a lip (on the lead-in ramp), which would explain why it caught weirdly in one of their runs. From looking at the field drawings, there should be almost no lip whatsoever