Re: AndyMark Teasing us
 

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

Re: AndyMark Teasing us
 

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

Re: AndyMark Teasing us
 

How much will each additional stacked stage cost?

Chris

Re: AndyMark Teasing us
 

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.

Re: AndyMark Teasing us
 

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.

Re: AndyMark Teasing us
 

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 ;)

Re: AndyMark Teasing us
 

$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.

Re: AndyMark Teasing us
 

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?

Re: AndyMark Teasing us
 

How about a whole series of keyed 25 series 7075 aluminum sprockets or even plain bore so we could broach them ourselves

Re: AndyMark Teasing us
 

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?)

Re: AndyMark Teasing us
 

I probably don't understand the market as well as you do, but the predominate purchaser of these would probably be teams doing a west coast drive. I imagine even if they are a smaller percentage of the overall customers, they're buying at least 8 per robot (we would probably buy 20).

That being said, for a west coast they'd probably want a higher tooth count, 18-20 is what I'm favorable to (I've heard some go to 22), and the ability to modify them after the fact for a 7/16" Hex or 1/2" Hex.

It'd also be nice if they were the same overall width as standard hubbed sprockets.

I'd trust your opinion over mine. However we probably wouldn't be buying any 16T #25's, but would definitely buy a whole bunch of 18T.

EDIT: I was just informed why teams use 22T. We'll probably use 22T now, and would prefer that :D

Re: AndyMark Teasing us
 

We will have some available that have no anodizing. We also do that with the AM Planetary gearboxes. At this time, we cannot provide the custom color anodizing.

Andy B.

Re: AndyMark Teasing us
 

Now wait a second...

Didn't AM used to make a planetary for the CIM that got discontinued because no one was using it?

Round gearboxes are hard to mount.

Re: AndyMark Teasing us
 

They had a square base that made them really easy to mount.

The Facemount of these gearboxes make them look plenty easy to mount.

Also, it was just a single very high reduction (180ish iirc) and not as modular as this.

Re: AndyMark Teasing us
 

Agreed, we probably wouldn't buy the 16T 1/2" keyed* sprockets either. If they were larger (preferably 22T) and with a smaller bore, we would most definitely buy a ton of them. More important than tooth count is the bore size, however. We could live with the 16T ones but would have a hard time with their 1/2" keyed* bore.