My team and I have been wondering how to apply our last 2 motors to our robot (currently have 4 base, 2 arm, 1 claw, 2 mogo). We want to add them to our base and increase our drive speed. Currently we have 4 high speed motors directly connected to each wheel with no external gear ratio. If anyone knows how to create a 3 motor gear box for fast speed to where I can attach to the back of my robot and run a chain to our robot’s front wheels. The gear box can utilize any 3 of motors (standard, high-speed, turbo). I appreciate all feedback and thoughtful responses. (PS: if there is already a thread nearly related to my post can you please link me)
It really depends on how much space you have. Since your robot is completely built you may not have space in the right places to fit a gear box. Posting a picture of just your drive will get you much more helpful responses.
Last season we did a 36T:36T:36T gear box with a sprocket on the middle gear. The sprocket drove two more sprockets; one for the front wheel and one for the back wheel. We had many issues in the beginning with the chain snapping bc we had too much/too little tensioning. Since all the wheels depended on the chain for power, if the chain broke then the entire side of the drive wouldn’t have power. After a lot of trial and error, we finally got the tensioning, but it was not elegant. Another team that we were close with wanted to make a similar drive, so we suggested that they hook up at least one wheel per side to the gear box directly so even if the chain snaps at least one wheel per side receives power.
You might want to consider doing a pair or motors and a single motor— instead of all three combined— per side so you have more flexibility.
We are using a 2 motor 1 bar chain bar with a 3:5 gear ratio. We can score 6 cones max at a very fast rate. We plan to add to the ability to stack higher if it is needed, but I’m sure at any tournament we can alliance with a high stacking robot while we finish 3 other mobile goals with 6 cones each.
So this is what’s weird (I didn’t expect any mind to be paid to the sprocket size, sorry). We only could find 4 sets of turbo gears, so we have 4 motors that are turbo (directly on the shafts with wheels) and 4 high speed motors chained to these with a 3:2 ratio, so the math works out.