Team 663 CAD Release

Attached are links to Team 663’s 2019 Robot, Marvin, and a refinement of our latest drive base design. The robot CAD was done in Inventor 2018 and was uploaded to GrabCAD. The drive base design, based on the drive bases from our Robots from 2017-2019, was done in Onshape.

https://cad.onshape.com/documents/5ef9d8ba43fa5a55897d27a0/w/f5f98231c5a4f766c2a05fa6/e/a96eaff3c0e90e3356061120

https://grabcad.com/library/first-team-663-2019-robot-marvin-1

Why did you guys choose to go with the 8020 extrusion frame instead of a traditional box tubing one?

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Does your team intend on using this drive train during the 2020 season? If so I would highly recommend looking into the kitbot.

8020 or T-slot extrusion is significantly heavier than box tubing offering little if not no extra “strength”. In addition it limits your mounting options to using fiddly t-nuts, which makes mounting and removing things way harder than it needs to be.

I would also recommend looking into a WCD style design if you are interested in making custom drive train.

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As a team that used 80/20 frames on a regular basis in years past, (before switching to sheet metal frames), there are some advantages to an 80/20 frame, particularly for enabling iterative development during the early build season without having to do all design work in CAD and then waiting for parts to be manufactured.

When using an 80/20 frame, however, once the proper connection points were determined, we would through-drill all connections, as just relying on the t-slotted brackets for drivebase rail connections would eventually result in the connections shifting during collisions with field elements or other sudden impacts.

However, 80/20 frames aren’t necessarily a bad thing, depending upon team resources and what other alternatives are available to a particular team. We used an 80/20 frame in what one could argue was our best year ever (Einstein finalists in 2013.) Yes, they’re heavy and liable to having connections shift, but they are hard to beat for quick mechanical adjustments in prototyping or frequent iterations.

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