pic: Nah, We just have a set for the Alpha bot and the beta Bot

[thefro526]

I think theres two wheels per module with the drive shaft going down between the two. The second wheel on each module could be to spread the weight out so that the wheels wear slower...

[Kevin Ray]

thefro526, you hit it on the head. We have two bots and two wheels on each module. We went with the two wheels only because the drive shaft leading down to the bevel gear comes down on the side of the wheel and creates unnecessary stress on the horizontal shaft. By sandwiching the bevel gear we equalize the downward force.
As for the traction, it's simple physics. We neither gain nor lose traction. We especially like that they swap out easily and will bring the 4 beta bot spares to the competitions--hopefully unnecessarily.

[thefro526]

Originally Posted by Kevin Ray

thefro526, you hit it on the head. We have two bots and two wheels on each module. We went with the two wheels only because the drive shaft leading down to the bevel gear comes down on the side of the wheel and creates unnecessary stress on the horizontal shaft. By sandwiching the bevel gear we equalize the downward force.
As for the traction, it's simple physics. We neither gain nor lose traction. We especially like that they swap out easily and will bring the 4 beta bot spares to the competitions--hopefully unnecessarily.

So awesome. I love when I'm right.

Thats an awesome way to build a crab though. I really like the amount of forethought that you've put into this. I wish you all the best! Whats the projected weight on the whole thing? It seems like it may get heavy pretty fast with the extra wheels though.

[Andy L]

Can you guys post a picture of a completed module when you have one done?

[Fe_Will]

Are you using custom hubs or AM ones on the wheels?

[Kevin Ray]

To answer three of the above questions;
1. Yes, I'll post pics of the hubs completed and installed, I left the camera in the shop or I would have done it this evening.
2. The weight is heavy--about 4.7 lbs for the complete module. We were going to put some "speed" holes in it but just haven't gotten around to it yet. We will, however, if we're close on weight overall. We just installed them on the bot this week and used .078 thick thrust bearings in a delrin sandwich. OHHHH baby!
3. Yes, they are AM hubs, half are milled down to fit (We don't want to take advantage of our sponsors by having them make that which we can get elsewhere).