AndyMark Stackerbox

[Andy Baker]

Originally Posted by s_forbes

Since the input gear is the same as the one on the AM singlespeeds, it should be pretty easy to convert one to accept a small CIM. Maybe you could manufacture a simple conversion plate for this...

Hmm...

This is another good idea. I will look into it.

AB

[MrForbes]

Don't encourage him, he's supposed to be studying for finals!

[AndyB]

I'm stunned. What a brilliant idea. No to tell you the truth, I was just looking for models for the AM Single Speed and ran across it. Screw getting my new year's kiss, I'm gonna wait on AndyMark.

I like the idea of the stacking planetaries though as well... maybe Andy has plans for that down the road as well.

[MrForbes]

Originally Posted by Andy Baker

The cool thing is... and here's where it gets its name... you can stack 2-3-4-5 of these things back to back and keep multiplying a 3.57:1 ratio to your output shaft.

how many of them can you stack up and not break stuff? 3.57 to the 5th power is a big number....multiply that by the torque you can get out of a typical motor .....think final stage BB failure....

Dude. This is awesome! I have a feeling you'll start seeing AM parts on 114 sometime soon... The quality has been going up and up, and I'm really quite impressed with the stuff you guys are rolling out.

A gearbox that is stackable makes a great arm setup. Sweet!

[Richard McClellan]

Originally Posted by squirrel

how many of them can you stack up and not break stuff? 3.57 to the 5th power is a big number....multiply that by the torque you can get out of a typical motor .....think final stage BB failure....

Ooh....yeah, that's definitely something to thing about....hopefully there will be some posted "recommended" limitations depending on the torque of your motor. Since they are supposedly infinitely stackable, no matter how hard those gears are hardened, there will always be a breaking point.

[Andy Baker]

Originally Posted by squirrel

how many of them can you stack up and not break stuff? 3.57 to the 5th power is a big number....multiply that by the torque you can get out of a typical motor .....think final stage BB failure....

Once we get some made (before Christmas, if all goes well), I will stack 2, 3, 4 or even 5 together to see what breaks. My initial guess will be the 3/32" machine key will shear. Hopefully, that is what will happen.

Andy B.

[MrForbes]

The only reason I brought it up is that I have seen some "interesting" use of compound gear reduction by a team that didn't seem to understand the problem of too much torque on too small of a shaft. As richardmcc2 noted, publishing a maximum torque spec would be helpful, because the ability to make a 530:1 transmission is really tempting for driving a heavy arm.

[AdamHeard]

Originally Posted by squirrel

The only reason I brought it up is that I have seen some "interesting" use of compound gear reduction by a team that didn't seem to understand the problem of too much torque on too small of a shaft. As richardmcc2 noted, publishing a maximum torque spec would be helpful, because the ability to make a 530:1 transmission is really tempting for driving a heavy arm.

Well, most arms I have seen have some sort of sprocket reduction as the final stage. So only 3-4 would be necessary to get that kind of ratio for an arm. Also, I hope that 5 together would be kind of awkwardly big as an extra reminder to rookies that maybe it's not a good idea....

[Andy Baker]

Stackerbox is now up on the AndyMark site.

An assembly print will be uploaded fairly soon. CAD is already available to download (.stp file).

Thanks for all of the comments.

Enjoy!

Andy B.

[MrForbes]

That's neat! and I see you implemented Steve's CIM idea....

[thefro526]

I love AM, they seem to always put a smile on my face. I was just thinking about gearboxes the other day in school. My team always likes to use chains for our mechanisms but they always seem to fail (usually because if missing pins lol) and this looks like a great alternative. I'm assuming that these will go through some preliminary testing when the first batch is shipped so there's not another BB like issue. Also when their stacked does one bolt right into the other flush or is there a little space and also is there a need to regrease the gears after they have been grease the first time?

[chris31]

Do you know the weight of one of these?

[Cory]

Originally Posted by chris31

Do you know the weight of one of these?

Andy said around 1.5 lbs, on the first page of the thread

[AndyB]

Originally Posted by Andy Baker

Stackerbox is now up on the AndyMark site.

An assembly print will be uploaded fairly soon. CAD is already available to download (.stp file).

Thanks for all of the comments.

Enjoy!

Andy B.

Looks very nice. Where is the link to the .stp file? I'm not seeing it.