By: Andrew Zeller
New: 26-10-2012 17:01
Updated: 26-10-2012 17:49
Views: 1124 times

This is a drivetrain that I have been refining for a few months and decided to see what CD though of it. We will be trying to get something similar fabricated to try out before build season.
Specs:
-0.080" 5052 Aluminum for all sheetmetal parts
-4" AM Performance wheels
-1/8" center drop
-Middle wheel is direct driven with hex shaft connected to output gear, outer wheels are dead axle connected with chain (not shown)
-Single speed gearbox with 20DP AM gears
-Gear Ratio= 7.44:1
-Theoretical Max speed: 9.1 ft/sec
-Common 3/16" rivet hole pattern
-Wheel center distance designed for exact # of chain links but there are slotted holes for tensioning
-Quick Bumper Mounting System using locking pins
-Weight: 36.6 lb in Inventor (incl chain, does not include battery)
-Bigger pictures: https://plus.google.com/photos/114984601526430182910/albums/5803737330732644657?authkey=CJ2MsK7HyOrGigE

Questions:
1. To support the hex shaft driving the middle wheel, I currently have two 3/8" bearings, one fit into outer channel and one on the inside of the gearbox. Should I add a third bearing between the two, which would be attached to the inner channel?
2. The two gearbox plates are currently attached by their flanges, is it ok to do this or should I be using standoffs instead?
3. This would be our first time using hex shaft. Where do you recommend purchasing small lengths of hex shaft and what is the best way to keep the center wheel in place on shaft? (spacers?)

Thanks for the criticism.

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