Design Help for offseason bot

[Sperkowsky]

Hello everyone.

So our team had some issues with our robot this year with a design error that was so big it was instant fatality. (The elevator was just bad no need for pics).

We ended the sbpli regional in last place and it really crushed our team.

So we decided to build an entirely new robot from scratch.

We are using a spare chassi from last year thats stripped down to 6 inch mecanums.

Our first issue was that it was in the long configuration. It was possible to work with but we all decided to go for a team 20 apporach and have the mecanums facing sideways.

our second decision was material choice. We made the bad decision of using bar stock for an elevator track so this time we chose something much more robust and went for 2x1 aluminum rectangular tubing.

For the elevator assembly we are going to take peices of bar stock with 2 bearings on the sides gripping the tubing. With 4 sets of 2 bearings we believe it will slide nicely with any weight load and again the assembly is held together with 2x1 rectangular tubing.

we also decided to do powered intakes with 2 andymark motors with plannetary boxes. We dont know if how we them mounted is the best way though.

one big decision for us right how is whether its a big deal to have a built in ramp or just tether one.

The next big decision is what material to use to power the lift. Some people vote webbing some vote chain. Chain seems more robust and doesnt seem to fall victim to back drive as much where webbing seems more forgiving. chain will allow us to do a built in ramp as there is a few inches where we can attatch the chain to the ends of the elevator assembly. Another question there is do you think we need a chain on each side.

for the actual manipulator we think we are going to reattach our plastic tabs similar to ri3d indiana and have a raised hook section for recycling bins similar to cybertooth robotics.

btw most of our structure will be rivited together with L brackets

Heres a pic
http://gyazo.com/dca65feb9971c9cbbb49cc609963b393
thanks