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Unread 26-11-2014, 03:09
Thad House Thad House is offline
Volunteer, WPILib Contributor
no team (Waiting for 2021)
Team Role: Mentor
 
Join Date: Feb 2011
Rookie Year: 2010
Location: Thousand Oaks, California
Posts: 1,106
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Re: One speed vs Two speed gearboxes

This year, we had 6 Cims on our drive. During competition season, we were geared for 10.5 fps. With the wheels we had, this was traction limited, and we never got even close to popping breakers. But once we got to the highest level of competition at worlds, we were too slow to be competetive. We switched to 16FPS at IRI. The speeds with this actually allowed us to be competitive with the rest of the field. But in eliminations when our driver was playing rougher defense, we did pop breakers.

I would argue that with 6 Cims, the optimal points are about 10FPS for the low speed, and 16+fps for the high speed. With a 6 Cim drive, 10FPS will allow you to get around your half of the field basically as fast as possible, yet still allow you to not get in trouble with defense. Then if you need to cross the field, or the defender is faster then you, you can shift up to 16+fps and get across field very quickly.

If the field is split like 2010 or 2012, I would argue that a single speed 6 Cim 10 fps robot is the best you can get, because there is not enough room to use any higher of speed. For years like 2011, 2013 and 2014, you want to be able to shift up for extra speed to cross the field quickly. Those are the types of years shifter are useful, because they allow cross field travel faster.
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All statements made are my own and not the feelings of any of my affiliated teams.
Teams 1510 and 2898 - Student 2010-2012
Team 4488 - Mentor 2013-2016
Co-developer of RobotDotNet, a .NET port of the WPILib.