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Jul 16, 2014, 04:38 PM
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Rover repairs





Another rover test ended when a motor fell off. Everything not threadlocked is being revealed when it falls off. Nothing was originally threadlocked because it wasn't supposed to work. It did 8m40s per mile when it worked. It was extremely hard to keep up. It flipped over twice on pavement cracks.


Accessing the offending bolt revealed all the sensors for the 1st time. The alignment is so critical that it didn't work when reassembled. Another sensor for the left motor had to be shifted ever so slightly closer. Fortunately, the error was a visible amount.

At 8.8V, with no headlights, the right motor now used 60mA more when going forward than when going backward, without load. Left motor used 20mA more when going forward.

At 15V, with no headlights, the no load current of a single motor was previously 250mA. The left motor was now 230mA going forward & 200mA going backward. The right motor was now 430mA going forward & 220mA going backward.

After reseating a bearing & another sensor reconfiguration, the right motor used 250mA going forward & 260mA going backward. This should have a significant impact on range. Another test run revealed it may now be too fast. So any direction problem is decidedly the mechanics rather than the sensors.
Last edited by Jack Crossfire; Jul 16, 2014 at 05:29 PM.
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