pic: Isometric View of A 6WD module

[Cody Carey]

Ok, We've revised it somewhat, combining the two together. This is designed to fit down into the kitbot frame and bolt into place. All the axles will be driven, and the sides will be made of .125" plate. We are torn between welding the standoffs to the plate or having them bolt in place, but we'll see what happens.

[Ben Piecuch]

Um, maybe a stupid question here, but if you're using the kitbot frame to place this into, why are you even bothering with the side plates. Just use the kitbot rails to mount everything to. Am I missing something obvious that this design provides that the kitbot doesn't?

Overall, I'm confused about the whole design, but maybe that comes from my point above... The standoffs, which look quite bulky and overly complicated, look like they'll interfere with all your chain runs.

If you're able to laser cut the side panels, make them straight edged instead of rounded. This will allow you to put a small 1/4" bend into the top and bottom edges, providing a MUCH stiffer side panel. (Think, kit gearbox top support plate...) That way, you can remove most of those standoffs and just put a couple, well-placed hex standoffs at the corners and in the middle.

Are those custom wheels, or just custom hubs for the skyways? I guess you're trying to make live axles, but I'm not exactly sure why... Could you please add some more detail to the description of this setup.

Sorry if this seems like I'm harping on the design. I just don't understand why all the custom/elaborate machining is required.

Thanks,

BEN

[Andrew Blair]

Ben,

We have had our share of drive train issues in the past couple years, and intend to resolve them, without a huge amount of weight increase for reliability. The modules will provide the ability to quick-swap modules, damaged, inoperable or otherwise, in a very, very short amount of time. They also provide the option of live-axles, which will alleviate some of our machining headaches (Bolt circles and the like). For us, broaching is easier than fighting with many custom bolt circles. We use an elevator wheel, and in order to interface it with our drivetrain, we need a custom hub and sprockets. Live axle allows us to standardize components.

As far as the frame goes- the kitbot frame is simply an option. Ideally, we'll weld our own out of box tubing, but should the need arise, we are capable of using the provided frame. The standoffs are just another design beef-up, and we intended to use fairly large sprockets (1.5") to begin with- so the chain run will not be affected.

As far as the lip idea goes, I like it. However, when we give the drawings to our sponsor, it's often a courtesy, (and a time factor) to simply have them free up one machine for a few minutes to cut a part- reducing the number of operations they must complete. I do see the strength benefit possible however, and we definitely will look into it.

As a rule in the design, we were looking for ease of removal, robustness (very important), and perhaps most of all, aesthetics. But thanks for the constructive criticism, and keep it coming! It helps to have another view to make it better. All the CAD has been done by Cody thus far though... Hopefully we get done soon for his sake!

EDIT- Also, the standoffs won't be nearly as bulky in the final product- we're using an old version of the bolt plate, and twice the number.