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Originally Posted by Veselin Kolev
Well... team 258's design was huge and heavy, like 20 pounds per module. Also, this design is different because the motor and the wheel are on the same axis, and the gear reduction is INSIDE the hollow wheel. This makes for a very compact design, and actually very robust. Let me post some more pics, since the design has changed a bit.
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Just for the record...
Our modules were heavy, but not that heavy. They could have been extremely light if we had done some simple machining on the gears, and used different brackets to mount the modules. The drill assemblies were about 10lbs (including the vertical shaft, aluminum washer, mounting bracket, and sprocket) and the CIM assemblies were 12-ish lbs. Our sweep diameter was quite small, too (about 6.8" for the drill module, and 8.5" for the CIM module). Our sweep diameters could have been even smaller had we not designed to fit under the 14" bar.
Also, having the wheel and the motor share centers doesn't necessarily make your module's sweep diameter small, especially when you're talking about a module for the CIM motor. What makes the sweep diameter small is trying to place the midpoint of the length of the motor and geartrain directly over the pivot point of the module. If you don't do that, you're already behind the game when it comes to conserving space. I don't mean to say that you're not significantly cutting down the sweep. It looks nice.
Veselin,
I'm curious as to what pitch gears you're using in your assemblies. We used 20DP gears, except for a 0.7M gear that mated with the drill motor pinion. I don't really have a reference point, but it looks like you're using 24DP or smaller gears. Looks nice Veselin. I'm looking forward to seeing it at events
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