Thread: 130lbs to 140lbs.
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Unread 23-06-2002, 22:11
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Another reason to stay below 130 lbs.
Posted by Thomas A. Frank.

Engineer on team #121, The Islanders/Rhode Warrior, from Middletown (RI) High School and Naval Undersea Warfare Center.

Posted on 3/1/2000 1:50 PM MST


In Reply to: 130lbs to 140lbs. posted by Anton Abaya on 2/29/2000 10:07 PM MST:



Hello All;

There's yet another reason to stay with our below 130 pounds...the drill motors.

FIRST notes in their maunal that these motors (which all experienced teams use for propulsion) were designed for driving screws and drilling holes, not for moving 130 pound robots...they are approaching the limits of what can reasonably be expetced of them in this regard. If the weight goes up further, you can expect to start seeing failures in the gearboxes etc.

No, unless FIRST finds us more powerful motors and batteries (we're already exceeding the maximum current supply capability of the SLA's*), the weight CAN'T go up much higher. Unless we have very slow machines...

Tom Frank

* a machine using both the drill and F-P motors for propulsion can easily draw 200+ amps at startup - we've seen it - and what we've found is that at these current levels, the battery itself acts as the current limiter in the system. The voltage just keeps dropping, even with a freshly charged, new battery. Yet another limitation and design tradeoff...


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