What gears are those?
Sketchy? Naw… nutty, perhaps.
They look like FTC gears…
Gearbox looks good but I worry about what you plan to put on the output of that thing. Remember that very few wheels were ever designed to spin at those kinds of high speeds and whatever does needs to be built to withstand very high centrifugal forces.
Put a guard on whatever you are spinning. People have had trouble with separating tread running at the speed of a CIM motor. With this you are doubling it.::safety::
Its awesome, just be very, very careful.
PS: can you post a video once you spin something with it? 
These CIM motors are geared down right? Just make sure you don’t have a problem with power if this is what is driving the robot. If this is for a wheel on a shooter, then it looks like it could shoot a frisbee full court with the right type of motor. Test it out!
Looks like this is not a reduction but an increase.
That’ll be one heck of an output shaft speed… As mentioned above, be very careful!
Out of curiosity, what diameter wheel/pulley are you driving with that?
They are the FTC gears we had left over from minibots from 2011. It gears up the CIMs 1:2 using 80 and 40 tooth gears.
It will be driving a shooter wheel, and for safety it will be tested within the confines of a lexan box. We did manage to break a tread before, and it was stopped by the box.
What kind of shooter wheel are you using? What diameter? Are you using a treaded wheel? I can’t see clearly from your photo, but are you using ball bearings rated for the output RPM?
If you separated the tread off a wheel before, what design requirement states you HAVE to spin that fast? Have you tried spinning at a CIM shaft speed or slower? Maybe you will find that you don’t need more speed, you actually need less speed.
I don’t mean to sound harsh or overly critical, but too many of these shooter designs have not been fully thought out for safe, reliable operation and need to identify the safety and risk of operation.