I have an idea for a drive I don’t know if it has been come up with before but it is an X-Drive with in between the wheels you have omni wheels between them in the shape of a parentheses. What would be wrong with this drive idea I know there has to be something but off the top of my head I can’t come up with it (other than pushability) .
It has, as @9MotorGang said.
The main issue with this, and x-drives, is the implementation of gear ratios, and the not so ideal mounting (though a good builder can integrate the mounting pretty well).
with the implementation of 5.5w motors, asterisk drive seems more and more useless since 16.5w x drive pods are now doable and you get more power in all directions instead of just forward and backwards
I like x drives. I have no idea why, but I like them.
So more x drive ish things are nice.
The drawbacks are that it uses 6 motors, which isn’t a problem for us because we have unlimited motors. We are using 3d printed mechanum wheels because vex 's are massive, and we are using custom gears to get 420 RPM.
It’s a cool concept and it does work and it has significantly more force going forward and backwards as opposed to strafing because the two middle wheels don’t move while strafing.
I’ma need to know more about these 3d printed mechanum wheels.
VEX U - you can 3d print anything you want, even functional parts
Sure! So I designed the mechanum wheels to be vexu legal at the beginning of the season, so they use the 4" Omni rollers as the mechanum rollers. They are 3.25" so the work with the other 3.25" Omni wheels. Unfortunately, because of the awkward size of the rollers, I can only fit 11 around the wheel.
After the allowing casting for VEX U, I have adjusted the model to work with 12 rollers so that assembly of the mechanum wheels is easier. We also designed a mold for the rollers so that the rollers have a curvature that makes the mechanum wheels completely circular.
Right now, the mechanum wheel prints in two parts and you put the pins and Omni rollers on one half. Then you can screw the two halves together. Because there are 11 rollers around the wheel and 6 screw holes, there is only one position where they align correctly. With 12 rollers, the two halves should line up in any orientation.
Here is a 3" mechanum up close…Had some fun ideas for it, but using them with the 3.25" omnis was more practical.
Yes, the only limits on 3d printing are that you have to use FDM printing and cannot use Resin printers. So we have no limits on 3d printing, CNCing metal, unlimited plexi, unlimited motors, any pneumatics rated for 100psi, and linear slides, bearings or adhesives.
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