Quote:
Originally Posted by asid61
We're looking at a theoretical model right now, so it makes sense to compare theoretical weights. Kevin's theoretical weight for his shifting design posted a few months ago was ~7lbs IIRC, whereas Bryce's models for shifting designs weighed around 6.3lbs. Even if it wouldn't survive a season as in the CAD, there's at least 0.5lbs to play with to buff it up. And Kevin's design used only small steel miter gears, whereas this design uses much larger steel bevel gears.
Given that, I think it's possible that this weighs more than many designs posted previously. However, it is much more compact, and for many situations that can be more valued than the weight.
If you believed that none of the recent designs can survive the season, then you really should have said so ealier, when those designs were posted.
Also, I found this yesterday:
http://www.chiefdelphi.com/media/photos/34178
So Aren beat himself some years ago. 
EDIT: How is the bevel gear constrained axially on the shaft? Does it depend on the wheel to position itself properly? |
The larger gear in Aren's design might be larger but the smaller gear is much smaller. I would go off tooth size and not OD of the largest gear.
Our actual module weighs in at 7.5 lbs with no additional lightening of the gears, etc. This is too be expected since all the steel screws weren't added to the CAD model. We'll post a video of it driving around just as soon as it is, should have it powered up this afternoon.