Excellent. This makes me very happy and giddy inside for seekrit reasons. Out of curiosity, is the CAD for the gearbox available yet, and what is the mounting profile like?
I like it.
Looks great, and looks real light and compact for what it does.
will it fit into a gen1 shifter?
and how do you attach more stages?
No it’s not like the AM Planetary Gearbox. That is much smaller and made for the FP motors. This is much larger. You could make it fit but why would you?
If you look at the pick you will see the two thinner rings, those are the stages.
i saw those, more speciffically i wanted to know how the gears from each one intermeshed(like does the output of one just go into the input of the next)?
why would I?
because it would be interesting.and is’nt that kinda what FIRST is about? (that is getting kids interested in engineering and techology)
It does look slick.
Modular planetary stages are a cool idea. I have found the ones from Matex very useful for developing new solutions, in my day job. Of course, those don’t come with CIM mounting features, so AndyMark’s new product will be much more convenient when using that motor.
Which I sincerely hope we will continue to do in FRC. :]
It does look slick, is most like yet another excellent product.
For me, though with a ratio of 181:1 I wonder if a fisher price motor (AKA Power Wheels) could be adapted to fit.
That is a single stage as a understand it with a 3:1 ratio. I was looking for a metal gear box similar or greater in ratio to the plastic one we get for the FP motors.
Put the FP on the AM Planetary and then put that into the new gearbox or use it with a combo of stackerboxes.
In theory, if the AM planetary turns a fisher into a CIM interface, could it then be the input for the GEM500? It may not be the most compact solution, but it seems like it could work. Andy, would this be possible?
-Eric
Yes, this is definitely possible. The AM Planetary gearbox has essentially the same mounting and output geometry as the 2.5" CIM Motor. So, wherever the CIM Motor could be mounted, so could the AM Planetary.
The GEM500 page has been updated with a price ($120), pdf layout, and stp CAD files (see “Downloads” at the bottom of the GEM500 page).
Thanks for all of the input and feedback.
Sincerely,
Andy
How much will each additional stacked stage cost?
Chris
This was what I was meaning in my previous post. Take an AM Planetary (3.67:1) + a new 3 stage GEM500 should equal the same ~181:1 gear ratio as a 4 stage GEM500. This begs the question: What about a AM planetary + a 4 stage GEM500 (~665:1) driven by a Fisher Price motor? This might be quite handy for an arm application but can the final stage of the GEM500 handle the torque? Andy, have you done any testing along these lines to see how much torque the GEM500 can take? This, of course, assumes we will still be getting Fisher Price motors this year.
Those wouldn’t look bad in anodized red or blue either 
What does GEM500 stand for anyways? I’m assuming the 500 is for the 1/2" output shaft.
Andy, what is the difference between “S25-66 Aluminum Sprocket” and “S25-66L Aluminum Sprocket”? Are you finally answering the community’s call for left-handed sprockets?
Also, you know what’d go great with these new gearboxes? Low tooth count, keyed hub, #25 sprockets 
$36 (this might change a bit) - This will include all pieces needed to add a stage: 1 carrier plate and sun gear, 5 dowels, 5 planet gears, 1 ring gear, and 1 stage housing
Chuck - yes, putting an AM Planetary into a 4 stage GEM500 will work fine. Past that number of stages, we have not done testing. However, we did design the shaft housing to be able to handle a 5/8" output shaft, and we will have a GEM625 available in the distant future (not ready for January).
We are not sure about colors yet. We may go with a less dramatic black and gray combination. Or maybe bright green or pink… naa.
GEM = Gearbox Epicyclic Modular (epicyclic is just a fancy name for planetary)
L = large bore (1.1245)
S25-66 has a bore of 0.8745"
S25-66L has a bore of 1.1245"
How about a 16 tooth, 25 series, 500 key hubbed sprocket, made from 7075? It’s coming, hopefully before Christmas.
Andy B.
Wow! $36/stage? That’s really… affordable.
So now you guys have a stackable spur box and a stackable planetary box. What advantages, in your opinion does the GEM500 provide over the Stackerbox and vice-versa?
How about a whole series of keyed 25 series 7075 aluminum sprockets or even plain bore so we could broach them ourselves
For teams interested in different colors, do you think it would be possible to work with you folks to either get the housing without anodizing, or with anodizing of our choice? (I’m thinking 254/968 will also want to know this, but if what you’ve done for them in the past with the FP planetary holds true, then the answer here should be yes? Ish?)