I heard about using a to power the tilter, saving a motor. How would a transmission work without motors or pneumatics? Can someone share some up close photos of transmissions so I can understand what’s going on? Thanks!

It would probably save a motor, however all the complicated mecanisms would probably add up to the weight of a motor.

Weight isn’t really an issue on my bot, the drivebase itself is actually really light, especially since it’s only 14 inches long (although it has protrusions that go to 16 inches). I just want extra motors >:)

That would make sense, but it would also likely cost more.

What do you mean by that? Do you mean that the extra parts would cost money? Because I have a ton of excess gears and axles that I never got to use

The general downside with differential transmissions is that they waste a ton of force on friction (which is what I think @CarCar meant by ‘cost’) and from my experience with them, are typically too bulky to fit into any design not based around them. I made a whole new type of differential transmis…

[image] I’m assuming by “no motors” you mean no more motors than those which are on your drive train. This is a prototype I drew about two months ago to see how simple you can make a differential drive train that can power both the front and back wheels (it’s harder than you’d think) this design w…

You could probably adapt it to fit your 14 inch bot if you offset the entire gearing upwards by an inch or three then moving the wheels together.

How exactly would that design switch between powering the tray and powering the drivetrain?

It works by the large (60 tooth) gears locking (you do this by having the motor that isn’t able to rotate around another gear not move at all) and the gear on the bar that does move being powered. [image] Or, you use two bars in this configuration where the motors spin the same direction to power…

VEX Forum

Passive transmission

VEX V5 General Discussion

marinmersenne September 6, 2019, 9:51pm 2

Differential transmission - power takeoff from the drivetrain motors Technical Discussion

[Vex differential transmission animation] In mechanical engineering Differential is primarily associated with a specific drivetrain component connecting axles of the powered left and right side wheels. But formally it is defined as: A differential is a gear train with three shafts that has the property that the rotational speed of one shaft is the average of the speeds of the others, or a fixed multiple of that average. For whatever reason, in vex context, any power sharing s…

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