T-20 reduction ratio in forward/reverse

[thebuggyman1]

I don't see any reason why the input shaft could not be switched to the other side of the trans.
Bob, check out the T-20 videos here http://www.6x6world.com/forums/conte...build-how.html

[BobW]

Msafi65, that is the kind of info that will change my plan. Thanks. Jim, I belive swapping sides for the input shaft will not relieve the issue, but I hope I'm wrong there. I'd rather have that solution than adding a stage of chain reversal.
I'll look at it tonight.

[BobW]

aaa2.jpg
aaa1.jpg

So, the dark metal diamond on the left (edit: I mean right) is in the counter-rotating position, and the gold one is in the same-rotation position. You can see where I pulled out the dark metal one, the groove/pin is towards the outside of the T-20. So, if I want the pin/groove to be inward, the gold one, the same-rotating one is in the right place for going forward, which is the way I had laid it out before. I am just surprised that the reverse gear would have less reduction than the forward gear. Thoughts?

[thebuggyman1]

My thought is the ratio is the same. When you determined the ratio, I assume you were spinning the input shaft and watching the output? I just wonder if you had some band slippage going on.

[BobW]

I put pieces of duct tape on the input and outputs and counted. Then did it again. Made sure each side was the same when rotating the same. Can put one in counter-rotate and one in same-rotate and see the difference in rotation speed. Maybe band slippage, as I am pulling the popsicle sticks without any levers, just pulling them in/out with my hands.

[thebuggyman1]

Definitely band slippage. You will need to use a pry bar on the pop cycle sticks.

[BobW]

Very interesting. I will check it out tomorrow. Thanks for the thoughts.

[BobW]

I put a pry bar against each of the popsicle sticks. Still the same funny difference in rotation. I did note how if the popsicle sticks are not fully moved, you can slipp the outputs (easier in one direction than the other). With this an an interesting point, to be understood, I'll go with the plan to mount as-is, since that makes forward have the diamond pin innermost.

[LarryW]

Maybe you have the ultra rare ratio torque amplifier t-20?

Just kidding. It is interesting stuff though. Someday I will have my t-20 tore apart to investigate hands on. I may be paying buggyman in beer to help me put it back together right though, lol.

[BobW]

The buggyman knows his stuff.