Banebots Gearmotor

[frank26080115]

My team wants to build a new mini sumo robot, and we're looking into making wheels similar to the one Seeker 2 uses (wheels are tubes that goes over the motor)

So I've looked at this motor:

http://banebots.com/pc/MS-16XXX-030/MS-16118-030

stall torque is: 0.02 kg * m
speed is: 99 RPM

The calculator on this site is telling me it's fine for a mini sumo robot.

What do you guys think? Is this good for competition?

[JonHylands]

That motor is fairly slow. Seeker 2 uses 76:1 gearmotors from Faulhaber.

That motor with wheels the same size as Seeker 2 uses (1.5" diameter) would give you a speed of about 8 inches per second, which is really slow.

I would consider the 54:1 version - http://banebots.com/pc/MS-16XXX-050/MS-16054-050 for a decently fast mini sumo.

- Jon

ps - I'm building a new mini sumo to replace Seeker 2, which will be called Seeker 2x. I don't know if you know, but Seeker 2 won the masters mini sumo division of the Canadian National Robot Games last Saturday...

[frank26080115]

Yea I watched, congrats! And danm, it was cool to see it in person.

I was considering the ff-050 series, but they seemed too long
http://banebots.com/pc/MS-16XXX-050/MS-16118-050

I am forced to use 4cm diameter wheels

You're right, it does seem slow, the one you recommended is perfect, thanks

[JonHylands]

This is the motor I am going to use with Seeker 2x:

http://banebots.com/pc/MP-MISC/MP-13017

Its ridiculously fast, so much so that I will only be able to run at a much lower than full speed most of the time...

- Jon

[frank26080115]

but
but
but...
that's $39!!

If I recall, PWMing a motor only decreases speed and torque is constant at a constant voltage, right?

[JonHylands]

Yeah, that's right...

What's the problem with $39?

- Jon

[JonHylands]

Here's a video showing the final match: (sorry for hijacking the thread)

Edit - The YouTube button seems to be gone.

The video can be found here:

http://www.youtube.com/watch?v=TDVu3dFKWSM

- Jon

[Admin]

I was about to ask for a video until I saw this post . . . but your link is bad so I'll ask anyways

[Admin]

Hmmmmm so it occurred to me just now that I somehow messed up the youtube feature on the forum when I was trying to fix the site yesterday . . .

My web host corrupted a file and it took me forever to figure out how to fix it . . . which explains why the forum was down yesterday for an hour or two . . .

I just fixed the youtube feature so you can embed it again . . . hopefully I didn't break anything else . . .

sorry!!!

[Admin]

Amusing!

[youtube=425,350]LJFalobmxKk[/youtube]

[JonHylands]

I'll relink the final match here now...

[youtube=425,350]TDVu3dFKWSM[/youtube]

- Jon

[frank26080115]

My two http://banebots.com/pc/MS-16XXX-050/MS-16054-050 just arrived in the mailbox today, excellent stuff, I have 2.5mm of room to fit a wheel hub on the shaft and still have my robot under 10cm wide. This is plenty for my clever plan (which I will document ).

I'll see if I can make a CAD model of it

But, there is no room for capacitors (unless you are good with SMT), but i never use caps on motors before and everything was fine, would it be a problem here?

[Admin]

but i never use caps on motors before and everything was fine, would it be a problem here?

you mean caps on the motors right?
it will be fine - the caps just extend motor life and reduce electrical noise

[frank26080115]

is it something about the corrosion of the brushes inside from sparks? now that i have the gearbox, i can probably replace the motor if something happens.

what if the caps are on the motor driver and not the motor? is the electrical delay too long for them to have any effect?

[Danish Boy]

BTW the banebot gear boxes are really reliable, i use the 38-1's in my combat robot Black Wedge and i have had no trouble at all.

[frank26080115]

3D Model of the motors

If you don't have SolidWorks, get
http://franksjunk.thespudmall.com/banebotsmotor/banebots%2016mm%20ff-050.exe

if you have SolidWorks, get
http://franksjunk.thespudmall.com/banebotsmotor/banebots%2016mm%20ff-050.SLDPRT

[Admin]

Are you sure the caps wont fit?

You can just fold them up flush against the motor, or perhaps even on top.