Though I'm not sure of the net effect of "overpowering" another motor, as Bill Beatty suggested, he is correct in pointing out that a differential is not ideally suited to matching the output speeds of motors. Open gearing is simpler and more efficient, due to the fact that the performance of both electric motors is effectively linear, there is no need to accomodate different relative speeds--the gear ratio necessary to match the speeds of two different motors is just about the same at any given final output speed. If, for some reason, you were varying the input to the motors independently, then maybe this could be useful--but why would you do this? It would mean that at least one motor is not operating in the optimal state for a given situation! (It would be spinning faster or slower than it needed to be, and the differential would be matching the speed.)
The differential adds complexity, requires very high manufacturing tolerances, not to mention significant custom machining. It is large and heavy, and, with the size of the gearbox approaching 16", by my estimation, measures need to be taken to reduce its size and weight.
And a couple of other things:
Quote:
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the urban camo for the casing
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That looks like an approximation of galvanized metal, which probably would
not be used in such an application--there's no real need to prevent rust!
The drill motor that Tytus Gerrish has used is not the Bosch 3360 from last year, but instead appears to be a scaled-up version of the older Bosch drill, used in 2002 and earlier. (You can tell by inspecting the shape of the rear housing--the 3360 has an exposed rear section, with the contacts on the sides, instead of the fully shielded rear section.) I say scaled-up, because in the drawing, it appears to be of similar size to the Chiaphua (or did we decide that we'd all call them CIMs?), which is certainly not accurate.
-Tristan Lall