Team 1107B Taiwan Drive (credits to 4194B)

[murdomeek]

since we decided that this is going to be a bigger project than just "Experimentation", i think it would be better if we started a thread of our own

this was our first 2 iterations posted in their thread

got started right away today in class!
and i have not been this excited about robotics since... FOREVER ago!

first crude build:
http://i.minus.com/jblGGygPueGEZ8.jpg
http://i.minus.com/jbkFaZCkeVNWdf.jpg
http://i.minus.com/jHxi1gekZ9mqb.jpg

problems:
too heavy
too much friction
too "fat" (takes up too much room)

second iteration:
http://i.minus.com/jZBHJVSbVPCBG.jpg
http://i.minus.com/jKHHH9pO0KYkt.jpg
http://i.minus.com/j5P8fPkSTNmOX.jpg
http://i.minus.com/jD6cqPoPdxZYv.jpg
http://i.minus.com/jRXswWZZZyU3c.jpg

Solutions:
took off 4 12t gears
switched all the 12t gears from metal to plastic
replaced one side of the 60t gears with lexan! ^_^

vid:
http://www.youtube.com/watch?v=XGDps...ature=youtu.be

right now its 1:1 torque, and 3:1 speed

if we switch out the driven gear to a 36t gear and made the driven sprocket 12t
the entire module can be shrunk by 2 holes and the ratio would be .66:1 torque and 1.8:1 speed which is perfect
we will probably make those changes and duplicate the other side on monday or tuesday

[murdomeek]

today we worked hard afterschool and *Tada* our first transmission drive base!

we switched out the gears and sprockets and the speeds seem to work out well!
http://i.minus.com/j4JyLLL7PqACA.jpg
http://i.minus.com/jZtpuvb8Uq5Ym.jpg

vid: http://www.youtube.com/watch?v=K2Ljp...ature=youtu.be

we just duplicated it and slapped on a microcontroller, 5 mins of programming, and Voila!

http://i.minus.com/jHv2FkAl6ePjJ.jpg
http://i.minus.com/jbngXj1idXTuXi.jpg

Vid: http://www.youtube.com/watch?v=vmsuK...ature=youtu.be

you can clearly see the difference between the high torque and high speed difference
it is pretty awesome!
there are still small issues we have to fix but overall it was pretty successful


whats next: we will likely be fixing the minor "friction" issues the high speed mode is sometimes having issues with
we might just build a 3 speed transmission next

if you have any questions, dont hesitate to ask!

[dontworryaboutit]

Looks really good so far!

I forget who suggested this first, but try powering the planet carrier directly with the motor (so you don't use the intermediate 36t gear).
The sun gear should be held in place by the 4 planets well enough so you don't need the extra support.

[anthonyl14107096]

Something you can do to get rid of the extra gear that drives the planet carrier is to change the green insert to a metal insert. Then split the shaft so the shaft connected to the output is not inserted into the metal insert. This way less space is consumed, however the ratio would be different. It would be more geared for speed. 1:1 instead of a 1:3 roughly

[StephenDsDude]

Gah, curses you! :P

I was going to make something like this, but unfortunately we have limited pieces (my club has 5 'equal' teams). I was only able to make one complete assembly (we don't even have enough small gears, not to mention my team's has slightly bent teeth = friction).

So I made this this past weekend:
http://www.vexforum.com/gallery/showimage.php?i=5704

[dontworryaboutit]

Originally Posted by anthonyl14107096

Something you can do to get rid of the extra gear that drives the planet carrier is to change the green insert to a metal insert. Then split the shaft so the shaft connected to the output is not inserted into the metal insert. This way less space is consumed, however the ratio would be different. It would be more geared for speed. 1:1 instead of a 1:3 roughly

I guess you were the one who initially suggested that then? I've suggested that twice already because I couldn't find your original post.

Yeah the sprocket would have to change back to a 30t sprocket to maintain the right ratio.

[anthonyl14107096]

Originally Posted by dontworryaboutit

I guess you were the one who initially suggested that then? I've suggested that twice already because I couldn't find your original post.

Yeah the sprocket would have to change back to a 30t sprocket to maintain the right ratio.

yea, i suggested it in the 4194B Planetary... thread, http://www.vexforum.com/showpost.php...1&postcount=69

[1one.flag1@gmail.com]

what exactly...is the purpose of taiwan drive?

[murdomeek]

so you can go fast if you want
or strong if you want
all without using pneumatics

[aslw26]

Still can't get it... How does it work?