pic: 2 Speed Vex Transmission

[cire]

loading photo ...

[sburro]

Originally Posted by cire

Thread created automatically to discuss this image in CD-Media.

I like the transmission and think the concept is nice for a VEX bot but if you were to bring it to a FRC comp, I see too many gears binding and breaking. I think you would have to shift it not on the fly. This is the only problem I see.

[cire]

Originally Posted by sburro

I like the transmission and think the concept is nice for a VEX bot but if you were to bring it to a FRC comp, I see too many gears binding and breaking. I think you would have to shift it not on the fly. This is the only problem I see.

The tranmission works great actualy, though you are right about the gears breaking and binding. Its only a matter of time before they break, I actuly found some plastic shavings that fell off of it. Im probably going to rebuild it so it has at least 2 gears in contact together all the time so its a little more robust.

By the way, it HAS to shift on the fly, when the gears are rotating it helps mesh them together.

[sanddrag]

Looks good. Although the small gear on the bottom left looks like it is positioned too fr to the left.

[doukjin]

Originally Posted by sburro

I like the transmission and think the concept is nice for a VEX bot but if you were to bring it to a FRC comp, I see too many gears binding and breaking. I think you would have to shift it not on the fly. This is the only problem I see.

yayy plastic gears

[ForgottenSalad]

Just curious, what did you use to convert the servo to linear motion?

[ICE MAN]

Thats insane. My FRC team is still trying to complte a 2 speed for our first robot and here you guys have made a 2 speed for the vex. well we better hurry or else everyone will be blowing us away with speed!

[Arkorobotics]

I am planning on making a really cool version of that just with the new Vex Pneumatics

[cire]

Originally Posted by ForgottenSalad

Just curious, what did you use to convert the servo to linear motion?

a lock bar at the end of the shaft coming from the servo is attached to a piece of metal which is being held between 2 shaft colars, when they servo moves it pulls the piece of metal and the whole shaft with it. It had a problem with jamming occasionaly though so i redesigned it, which you can see posted here:

http://www.chiefdelphi.com/media/photos/24522

[nonother]

Originally Posted by cire

a lock bar at the end of the shaft coming from the servo is attached to a piece of metal which is being held between 2 shaft colars, when they servo moves it pulls the piece of metal and the whole shaft with it. It had a problem with jamming occasionaly though so i redesigned it, which you can see posted here:

http://www.chiefdelphi.com/media/photos/24522

Your new design definetly looks more reliable but I noticed it used a spring. Since a spring isn't a Vex part would that make it not competition legal? Nonetheless awesome job.

[techen 5]

Originally Posted by sburro

I like the transmission and think the concept is nice for a VEX bot but if you were to bring it to a FRC comp, I see too many gears binding and breaking. I think you would have to shift it not on the fly. This is the only problem I see.

what are your gear ratios for each transmission level and could up send me more pictures from different angles of your 2 speed vex transmission

[Lil' Lavery]

a 116 alumnus is actually building a 4-speed vex tranny. Of course, it alone is too large for the FVC size requirements and recquires all 8 pwm outputs on the controller for just one. But then again, it also geared to theoretically have an output speed of 60 mph with one of the knobby wheels (although I doubt it would have enough torque to overcome static friction )

[lukevanoort]

This inspired me to design my own two speed Vex tranny. I simplified to two shafts (<-- kudos if you figure out how) and started building it, but I never finished. Maybe I'll take one of our Vex kits home and finish it under the guise of making an example to introduce the newbies to advanced mechanisms.