Instructables

Lego Technic 2 Speed Transmission

This is a very simple 2 speed transmission that I think anyone with a little bit of experience with Legos can build from a picture.

I get this idea from Sariel's* 4 speed transmission. I wanted to buy all the parts necessary to build his, but decided against it because I thought I could build my own, simpler, smaller version.

1st gear has a 3:1 gear ratio, which means the driver gear (the 8 tooth) has to spin 3 times to make the follower gear (the 24 tooth) spin once.
2nd gear has a 1:3 gear ratio, which means the driver gear (the 24 tooth) has to spin 1 times to make the follower gear (the 8 tooth) spin 3 times.


*
Sariel's Youtube : http://www.youtube.com/user/searme/

His Website: http://sariel.pl/
 
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lewster1 year ago
Looks great! I have been trying to make something like this, only to give up in frustration. This is really helpful, but could you put arrows on the diagrams to show the input and output of power? Thanks, Lewster
plywood24 (author)  lewster1 year ago
Seeing as how I have literally forgotten how to use instructables, I will just tell you.
The input is the axle that has the large black double bevel gear, the axle farthest to the left. The axle farthest to the right, with the dark grey 8 and 24 teeth gears is your output. I am not positive if you can reverse the input and output axles, it looks possible, however. Hope this helps.

-Plywood24
sawblade252 years ago
Once again, Nice