Banebot Gearbox

[chris31]

Ah. Thank you.

[Joe Johnson]

Originally Posted by Ben Piecuch

I haven't pulled apart the gearbox yet, but I was wondering the same thing. Dr Joe, care to give an answer to this?

While picking up the KOP at the Manchester Kickoff, I noticed that FIRST had built a couple practice bots. One robot used the new Banebot Trannies, and left the drive shaft fully cantilevered. Below you can find a picture. I was quite surprised to see if used in this configuration.



I don't think I'll be using it in this configuration, but YMMV.

BEN

Whoa! I don't know how I missed seeing that picture earlier but to me, that is about the scariest picture I have seen in a long time.

Perhaps the bearings inside that gearbox are better than I thought, but I would have never never never hung a sprocket that far out on that shaft.

I am thinking that the only way they got away with it was that they weren't really using it in competition and they must not have had the grippiest of tires.

Looking at that picture sends shivers down my spine! Really -- read this post for more on my views of emotion and engineering.

Joe J.

[Bochek]

Originally Posted by Gabe

All of the Banebots screws are metric (I had fun taking it apart), and if you dont use metric then you will strip the socket heads.

Agreed,
They are definitely metric. Go get your self a good set of ball end metric allen wrenches.

- Bochek

[ChrisR_522]

Originally Posted by Nick 568

Thanks, we've added more grease, but still nothing. I look forward to your response though!

UPDATE: We figured out what the problem was, apparently, the bushing was too long on one of the motors, so we ground it down on the lathe and all is well!

We were experiencing the same problem with the gearbox as well, the bushing was indeed too long. It was trimmed with the lathe and voila!

[MishraArtificer]

Anywhere I could get specs on the gearbox? (load capacity, structural integrity, etc.) We're thinking of using these for our bot's chain-driven 4WD, but we aren't sure what they can handle.

[gzevenbergen]

The allen screws in the end plate are 2mm metric. (the label reads made in China)

[Rafi Ahmed]

Originally Posted by MishraArtificer

Anywhere I could get specs on the gearbox? (load capacity, structural integrity, etc.) We're thinking of using these for our bot's chain-driven 4WD, but we aren't sure what they can handle.

We need them too!!

I'm noticing a great number of posts on the lack of QC on the BB transmission... Should my team be worried about maybe using this, as lack of QC can mean robot failure at the most inapprapriate time?

[sanddrag]

What exactly does the bushing being too long do to cause it to bind? Does the pinion on the CIM hit the planet carrier?

[afphillips]

anyone know how reliable the new BB 2 CIM gearbox adapters are?

[Gabe]

If anyone from FIRST is reading this, please include 1/2" shaft collars next year because it was no fun having to retain the sprockets onto the shaft with duct tape.

[sanddrag]

Originally Posted by Gabe

If anyone from FIRST is reading this, please include 1/2" shaft collars next year because it was no fun having to retain the sprockets onto the shaft with duct tape.

I suppose a trip to a hardware store or web browser was out of the question?

[Gabe]

Originally Posted by sanddrag

I suppose a trip to a hardware store or web browser was out of the question?

No, what I mean that since the Kit of Parts should include the materials for any team to build a basic robot, they could have included some shaft collars in the crates.

[dlavery]

Originally Posted by Gabe

No, what I mean that since the Kit of Parts should include the materials for any team to build a basic robot, they could have included some shaft collars in the crates.

It should? Says who? (remembering the days when all we got in the Kit Of Parts was a surplus computer printer and a Small Parts Incorporated catalog...)

-dave

[NeedMoreEngines]

Originally Posted by Gdeaver

I too have concerns about shaft loading on the BB trans. If we were to use the 2 cim adapter and use 2 sprockets to duplicate last years 4 motor 4 wheel drive kit bot, can the 56mm trans take that shaft load and input? Has it been tested. Is the bearing support necessary for a 2 sprocket load? Can the 56 mm trans handle 2 cims? Would a safer bet be 4 cims 4 trans? Joe any comments?

I actually emailed BaneBots tech support for EXACTLY this question. Here is their response:

The two motor adapter does not change the gear reduction so in a best case [assuming no mechanical loss] the RPM would be the same as with 1 CIM motor and the torque would be twice that of a single CIM motor.

The 56mm gearbox and two motor adapter was specifically designed for FIRST applications and we believe they will support two CIM motors.

BaneBots

I don't know though---It doesn't seem like that little sucker can handle those two big CIMs. I'd hate to find out the wrong way.