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Unread 11-12-2012, 11:01
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LeelandS LeelandS is offline
Robots don't quit, and neither do I
AKA: Leeland
FRC #1405 (Finney Falcons)
Team Role: Tactician
 
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Re: Why not to shift?

Quote:
Since we are not using pneumatics on our robot but we want higher power shifting than servos will provide,
a Window motor shifter was designed to switch between high and low gear. This design uses an opposing
cam design to push or pull the dog gear in the transmission from high to low gear. Springs were designed
into the arms to allow for each side to shift at different times without destroying the other side. We were
able to package this design so that it fits right between our gearboxes and take up no more room than a
pneumatic setup.
This is straight our of 67's 2012 Engineering Design log. Now, this is beyond my level of mechanical comprehension to really understand what's going on. But the jist of it is 67 used a window motor instead of a servo to shift their two-speed gearboxes. Because the window motor is more powerful, it allowed for shifting on the fly, as opposed to a delay of seconds when using servos.

For those who are opposing shifting when pneumatics aren't being used elsewhere on the robot. It's an interesting idea. If you're willing to give up the motors for it.
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