pic: Tiki Tech Transmission

[Gregor]

Originally Posted by TikiTech

We will be running 4 of these, potentially.

...

The weight with mini and full size CIM is 14.7lbs

including the encoder

I would not feel comfortable putting half the weight of my robot into gearboxes. This is even ignoring the breaker issues of an 8 motor high traction drive.

[cadandcookies]

Originally Posted by Gregor

I would not feel comfortable putting half the weight of my robot into gearboxes. This is even ignoring the breaker issues of an 8 motor high traction drive.

Agreed. It looks like a very nice gearbox, however. Especially with your drive setup, which looks like an 8WD with some nice elements (chain in tube, 6-sides), I'd reevaluate whether the best use of your resources is four independent, custom gearboxes. Regardless of whether you want to do 8-motor drive, the redundancy in weight running four gearboxes seems like an exceedingly problematic limiting factor when considering the rest of your robot.

But that's just like, my opinion man.

Really like some of the design that went into this (and the full chassis CAD)-- the motor controller mount between the gearbox is cool, and I like how your motors match the angle of your frame on the sides. There are a lot of cool elements here and I hope you guys can capitalize on what you learn with this offseason drive to make a killer drive train in the 2015 season!

[Henrique Schmit]

What is the idea behind having three stages? The way i see it you could probably do the same thing you have there with only two axles making it a bit lighter.

[asid61]

For your drive purposes, I highly recommend that you just design a 4 cim gearbox. Or, better yet, decrease to 3 cims.
Also, instead of using gears to combine the motor output, I would take a look at 192's design which uses belts for the first stage of transmission. You can combine the outputs of all the cims for a lot less weight that way instead of using gears. Then just use the shifting stage to shift between a 14:40 and a 34:60 stage (both of those shifting gears are sold by WCP) to get the last transmission stage.

[R.C.]

Originally Posted by asid61

For your drive purposes, I highly recommend that you just design a 4 cim gearbox. Or, better yet, decrease to 3 cims.
Also, instead of using gears to combine the motor output, I would take a look at 192's design which uses belts for the first stage of transmission. You can combine the outputs of all the cims for a lot less weight that way instead of using gears. Then just use the shifting stage to shift between a 14:40 and a 34:60 stage (both of those shifting gears are sold by WCP) to get the last transmission stage.

Did you mean 14:60 and 34:40?

[asid61]

Originally Posted by R.C.

Did you mean 14:60 and 34:40?

Bleh yes. Sorry, I was thinking of the ball shifting gears for the primary, and the dog shifting for the secondary.