Historically, our team has always used the same drivetrain. The left and right wheels would both be raised 1/16th of an inch, and the center wheel was always lowered 1/16th of an inch to achieve an eight-inch drop center. The gearbox would also always be in the center, with the thought process being to help us achieve a more central COG.
This year however for a number of reasons, we have decided it would be best to move our gearbox towards the back wheel. We also can to the conclusion this year that we wanted to use the more optimal drop center (achieved by using the formula Wheel Drop = Center to Center Distance/14 * .125), and that has added even more problems onto our list. The bearing block we had used beforehand (custom made with a 1/16th inch drop) will no longer work. It was easy enough to modify the existing part to accommodate a new drop-center, but we’re not fully convinced that we have the expertise to mill them out at the current time.
One idea that was brought up was raising the gearboxes only up to the ideal height (about 1/10 of an inch offset), and leaving the middle and right wheels directly in the center, and using some of the vexpro bering blocks without a drop center. I had some concerns about only having the drop center on the back wheel not creating enough of a drop (i.e. the robot wouldn’t rock enough). It’s very possible I’m just overthinking this and the drop center would work just fine with only the back wheel raised.
If I forgot anything please feel free to let me know. I’ve been a lurker for a while but never made a post myself before.
Tl;dr: Are there any specific issues to watch out for with having gearboxes in the back as opposed to the center? Will a drop center work just fine if only a back wheel is raised, and the two front wheels are left at y=0?