CIM + Banebots P60 Gearbox

[Geek 2.0]

Does anyone know if there's a way to make a CIM work with a Banebots P60 Planetary gearbox?

Also, if not that, does anyone know any good, cheap gearboxes? They're very expensive...


This is a non-FIRST application, so I'm not concerned about legality.

Thanks!

[Chris is me]

Any reason not to use the BB P80s with the CIMs instead of the P60s?

At $75 a pop, you can't beat the AM Toughbox Nano for a quick CIM gearbox that can take anything you'd ever throw at it.

[Geek 2.0]

No reason other than being REALLY cheap. Robots are expensive, and I want one, but I don't want to spend a lot on it. Gearboxes are the most expensive part, so we'll see...

[Andrew Schreiber]

No reason other than being REALLY cheap. Robots are expensive, and I want one, but I don't want to spend a lot on it. Gearboxes are the most expensive part, so we'll see...

Build a smaller one. Something sitting in the 30lb range should cost you ~$400 or so if done right. An FRC scale robot is actually quite a large machine.

[Geek 2.0]

Build a smaller one. Something sitting in the 30lb range should cost you ~$400 or so if done right. An FRC scale robot is actually quite a large machine.

Yeah, and I'm doing my best to make that $400 about $350, but when a single motor+gearbox is $100+, it's difficult.

[Andrew Schreiber]

Yeah, and I'm doing my best to make that $400 about $350, but when a single motor+gearbox is $100+, it's difficult.

Might I suggest using the p60's with an RS550 motor. It will cut down your metal costs, your ESC costs and manufacturing time. Building a smaller machine means you can throw it in a bag and use it to demo rather than needing a van to transport it.

[Geek 2.0]

I was actually planning on doing that. I just was wondering how much the step up to CIMs would cost.

Two quick things:
1. Would it be a good idea to just use sprocket and chain instead of gearing? It IS cheaper...

2. What's the best motor selection/gearing selection process? I've tried working out the physics, and I have some guesses as to what will work, but I'm just not sure.

[Andrew Schreiber]

I was actually planning on doing that. I just was wondering how much the step up to CIMs would cost.

Two quick things:
1. Would it be a good idea to just use sprocket and chain instead of gearing? It IS cheaper...

2. What's the best motor selection/gearing selection process? I've tried working out the physics, and I have some guesses as to what will work, but I'm just not sure.


That is dependent on your reduction, a sprocket and chain reduction is great for a place where you have a small reduction (imho <10:1) and have to transmit power over a distance anyway.

http://www.chiefdelphi.com/forums/showpost.php?p=963816&postcount=25 Should help you with #2

[Geek 2.0]

Wow, that post is REALLY helpful!

Does anyone know the static coefficient of friction of AndyMark Omni-Wheels on carpet and/or other materials? If not, I'll probably start a new thread requesting it...


Thanks!

[biojae]

Wow, that post is REALLY helpful!

Does anyone know the static coefficient of friction of AndyMark Omni-Wheels on carpet and/or other materials? If not, I'll probably start a new thread requesting it...


Thanks!

They are all on the andymark website.
Which omni wheel do you want to use?

Their 6" aluminum omnis (AM-0097) have these coefficients:
1.0 radial static
0.8-0.88 radial dynamic
0.2-0.27 transverse static
0.16-0.2 transverse dynamic