pic: Shifting Mechanism 222

[Andrew Schuetze]

Kudos to your design team ,

My question for you, "What device do you use to engage the three detent positions on your shifting shaft?" I've seen small pnuematics on two speed trannies and even built a CD two speed using the drill planetary set using a servo. I have some doubts about a servo having enough torque for this applicatin

APS

[team222badbrad]

I didn't machine the shafts because of the level of accuracy that they needed to be; I was busy making other components of the robot/transmision.

Everything on our robot is built in Tunkhannock High School by students with the help of mentors.

The only thing we had to "outsource" for these transmissions from the school was the shafts and gears to get heat-treated, since our school does not have this capability.

They were made in the school and then taken to some company for the heat treating.

Shifting Question:

Our transmission really does not take that much strength to change gears. The main thing they need to shift is accuracy. We used two small pneumatic cylinders to shift.
On cylinder moved the transmissions to either first gear or third gear; the other cylinder was used to wedge the shifting forks into second gear. This required the cylinder that shifts the gears from first to third to become pressureless.

Here is the best pic I can find at the moment:
http://www.tigertrons.com/2004/2004bot3.JPG

Also more pictures can be found here:
http://www.tigertrons.com/pictures.htm

[Stu Bloom]

Very, very nice ... do you have any drawings and/or CAD files you wish to share??