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Unread 03-11-2014, 08:48
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JesseK JesseK is offline
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Re: pic: 1885 Drivetrain

Quote:
Originally Posted by ToddF View Post
Using 8020 for the cross bars is an interesting idea.

One question, does the use of the vex bearing plates allow the chains to be moved inside the side rails?

Any chance you will have your drive train at the FRC workshops in Richmond?
The 80/20 was an accidental "innovation". We had plates made for riveting, then found out we used all of the rivets on something else, and then we lost one of the plates. So rather than delay another session, Stephen and I came up with the idea for the 80/20 while looking through our stashes of metal tubing. It won't make the cut for a production robot (80/20 can't be powder-coated) but for a prototype it's pretty nice.

The VEX bearing plates are not counter-sunk, so the flanges are completely on the outside of the plate. Since there is 1/4" worth of bearing plate on the outside of the tube, this means there is a nice round 1" of axle between the live bearings inside the tube. If you can fix 2 #25 chain runs inside that (subtract the walls, of course) then there's nothing stopping it.

Edit -- ooh, just thought about it - you'd have to 'nix the WCP bearing block on the outside of the direct-drive gearbox in order to run chain in the tube. This means you're responsible for your own alignment of the gearbox to the frame rail. There are 3 major reasons why I really like the WCP & VEX block combination, and this natural alignment is one of them.

I and my team are pre-occupied with a 48 team FLL tournament the Saturday of the Richmond workshops. I'll be out of town the Saturday of the 1418 workshops. I actually wanted to present a lecture on drive trains and over the summer designed the schedule for this prototype to be ready in time for the workshops. Then we got our FLL dates . I'd do it if I weren't head judge or head ref.

Last edited by JesseK : 03-11-2014 at 09:01.
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