paper: Killer Bees 2011 Robot CAD model

[apalrd]

1. The spacer that the articulating wheel pivots about sits in a milled block inside the tube. There are two bolts going from the end of the tube to the block, which has taped holes. To tension the chain, the two bolts are tightened.

2. There is a bolt going through the tube (with a spacer in the tube) and the cams, with a nut on the cam side. We loosen the bolt attaching the cam, loosen the bolts on the bearing block, tension the cam, then tighten the bolts again. No, they didn't work themselves loose.

3. Yes, it has the possibility to rub, but it will wear a hole for itself.

4. The collar is welded on one side to the side plate.

5. Yes, it is for counterbalancing.

[Alex.q]

Sorry for reviving an old thread, but I was looking at your CAD and had a question about it. On the wheels, the hub that you use to attach the wheel to the axle is right up against the bearing blocks. How did you attach this hub to not need space for the head of a bolt to attach it to the wheel? Also, there doesn't appear to be anything to prevent the sprockets from moving along the axles (in the axial direction). Is this accurate?

Thank you in advance for answering my questions and more importantly thank you for posting your CAD.

[waialua359]

Jim,
as usual great job once again!
Between that and what you shared from your 2010 drivetrain in tackling the large bump.....they are both great works of art, and useful for us to see the design process you folks experienced and succeeded with.

[apalrd]

Originally Posted by Alex.q

Sorry for reviving an old thread, but I was looking at your CAD and had a question about it. On the wheels, the hub that you use to attach the wheel to the axle is right up against the bearing blocks. How did you attach this hub to not need space for the head of a bolt to attach it to the wheel? Also, there doesn't appear to be anything to prevent the sprockets from moving along the axles (in the axial direction). Is this accurate?

Thank you in advance for answering my questions and more importantly thank you for posting your CAD.

They're there, just not in the CAD.

The hubs are countersunk and we use flatheads, so there is not much to interfere. The bearing blocks are taped for a #10-24 bolt, and the bolt heads are on the other side (not the wheel side). We put in a single wave washer between the bearing block and the wheel hub.

On the sprocket side, we have a (lacking knowledge of the actual name of the part) press-on shaft collar.

[Jim Zondag]

Alex, The attached picture shows the sections view through the wheel and hub assembly. The inboard side is held in place by a pushnut. Outboard side uses a screw into the the counter bore in the axle. We counter sink the AM hub and the bearing mount to and use flat head 10-24 screws so we avoid any fastener collisions.


[IMG]file://localhost/C:/FIRST/CAD_Projects/2012_hybrid/Wheel_hub_assy.jpg[/IMG]

***Not sure why image does not show**

[Andrew Schreiber]

Originally Posted by Jim Zondag

Alex, The attached picture shows the sections view through the wheel and hub assembly. The inboard side is held in place by a pushnut. Outboard side uses a screw into the the counter bore in the axle. We counter sink the AM hub and the bearing mount to and use flat head 10-24 screws so we avoid any fastener collisions.


[IMG]file://localhost/C:/FIRST/CAD_Projects/2012_hybrid/Wheel_hub_assy.jpg[/IMG]

***Not sure why image does not show**

Because file is on local host? Upload to imgur or some such thing or attach it.

[Jim Zondag]

Andrew,
Thanks, Duh, I figured if I pointed to the URL of the file it would upload it.
I think this is the first time i have done this operation on CD, however, there is sometimes a way to attach a file or local image to a post, or at least there used to be

This is the wheel/hub assembly drawing with section view

[I LOVE ROBOTS!]

Just curious, where did you get those cylinders?