I’ve been doing test runs with the new wheel casters for a few days now, and they are definitely better in some regard and not so good in others. One big advantage is the ability to go over cracks much easier and they’re more durable. However in my limited testing they’re not as good on door jams and similar obstacles.
Also, with installing the larger 3″ casters in the front foot my droid is now lifted and angled a tad.
Unfortunately, the shoulders and legs are fixed with no real easy way to adjust them and the outer feet are tipped with the rear much closer to the ground.
I’m not sure how much of a problem this really is, only time will tell. If it does become a problem some possible solutions might be
- Adjust the high of the outer feet drive system – might be tricky, and not sure I want to add any more ground clearance.
- Try and move the 3″ casters further into the center foot shell – not really an option as space and margins are already tight.
- Try a smaller wheel caster – probably the easiest thing to try, but I then loose some of the advantages of the larger 3″ wheel.
One of the issues I see right now are the ominballs in rear of the outer feet. Before I moved to the 3″ caster they didn’t touched the ground, this was intentional on my part. I could have easily removed them a long time ago, but they’ve gotten me out of a fix on more than one occasion.
With the belt drive system, the wheels are locked and hard to move when there’s no power applied, with the omni’s in place I can tip Artoo back onto them and maneuver him a little – not long distances mind you, but very handy in a pinch – So I’m hoping to keep them in place.
They are adjustable, but already on the max setting. One of the big problems is there’s always a chance the drive wheel could loose contact with the ground if the rear omni’s ride on something.
I have a big event coming up this weekend with lots of mixed terrain so the jury is still out if I’ll stick with the wheel casters, maybe I’ll try a smaller diameter wheel or even go back to the omni’s.