Quote:
Originally Posted by DampRobot
I'd say that if they wanted to shift, that they should have planned for pneumatics (at least a stored system with a small plastic tank). There's not a whole lot of point to buying an expensive, heavy shifter and then crippling it by not letting it shift on the fly.
If you really can't find the weight for pneumatics, calculate the strategically optimal speed, and just go single speed. You honestly don't need to shift that much anyway, and I'm sure you'll be able to improve your manipulator with the 2 lbs you just bought yourself.
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Team 67 would like to disagree with you. This is taken from their 2012 Engineering Design:
"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."
The entire paper can be viewed here:
http://hotteam67.org/hot_Engineering...Tech_Notes.pdf