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Unread 01-19-2017, 09:45 PM
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Team 449 Climber

This is the climber prototype built by Team 449, the Blair Robot Project. We weren't sure how legal it was to use Velcro, so we build what I've been calling macro-Velcro: spinning "hooks" (actually just bolts) that grab a loop. There's also a slipknot that allows the rope to wrap around the winch reel a couple times before it starts bearing a load. We complete the climb in about 6 seconds. Questions/suggestions are welcome!

Video

CAD:

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Unread 01-19-2017, 09:48 PM
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Re: Team 449 Climber

Looks sick. What gear reduction are you using?
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Unread 01-19-2017, 09:50 PM
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Re: Team 449 Climber

You have plans for something to trigger the touchpad before you run into the channel? You'd probably hit the touchpad first tilted sideways like that, but you might not if you went up especially balanced.
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Unread 01-19-2017, 09:52 PM
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Re: Team 449 Climber

Quote:
Originally Posted by Kevin Sevcik View Post
You have plans for something to trigger the touchpad before you run into the channel? You'd probably hit the touchpad first tilted sideways like that, but you might not if you went up especially balanced.
Far from impossible. Just add some 2" sticks extending straight up (or whatever direction you're climbing).

Last edited by ollien : 01-19-2017 at 10:02 PM.
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Unread 01-19-2017, 09:53 PM
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Re: Team 449 Climber

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Originally Posted by messer5740 View Post
Looks sick. What gear reduction are you using?
50:1 on a VersaPlanetary attached to a Mini CIM.
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Unread 01-19-2017, 10:00 PM
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Re: Team 449 Climber

Quote:
Originally Posted by Kevin Sevcik View Post
You have plans for something to trigger the touchpad before you run into the channel? You'd probably hit the touchpad first tilted sideways like that, but you might not if you went up especially balanced.
Not yet. Ollien's suggestion of sticks could work, as could a pneumatically-actuated bar of some sort. Thanks for telling us this!
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Unread 01-19-2017, 10:13 PM
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Re: Team 449 Climber

Quote:
Originally Posted by ollien View Post
Far from impossible. Just add some 2" sticks extending straight up (or whatever direction you're climbing).
Nothing's impossible or even very difficult at this stage. It gets tough when you show up at your first competition with a climber at the very top of your robot volume, though. I think there's a lot of people forgetting that the challenge isn't climbing, it's pressing the touchpad for >1s.
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Unread 01-19-2017, 10:47 PM
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Re: Team 449 Climber

How much weight was that in the video? Looks like a cool design! (At least, it's not velcro anyway )
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Unread 01-19-2017, 11:20 PM
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Re: Team 449 Climber

Quote:
Originally Posted by jojoguy10 View Post
How much weight was that in the video? Looks like a cool design! (At least, it's not velcro anyway )
It probably weighed about 40 pounds, although we designed it to lift 150. It's the frame (made of 80/20) from our 2010 robot, with a battery and electronics board attached.
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Unread 01-19-2017, 11:21 PM
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Re: Team 449 Climber

Very impressive. What power was the motor running at?
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Unread 01-19-2017, 11:37 PM
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Re: Team 449 Climber

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Originally Posted by OMGRobots1 View Post
Very impressive. What power was the motor running at?
Full power.
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Unread 01-19-2017, 11:49 PM
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Re: Team 449 Climber

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Originally Posted by qscgy View Post
It probably weighed about 40 pounds, although we designed it to lift 150. It's the frame (made of 80/20) from our 2010 robot, with a battery and electronics board attached.
I'd be very interested to know how it performs at about 150lbs (maximum robot weight is 154lbs)
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Unread 01-20-2017, 12:13 AM
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Re: Team 449 Climber

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Originally Posted by jojoguy10 View Post
I'd be very interested to know how it performs at about 150lbs (maximum robot weight is 154lbs)
The gearing was selected very conservatively to ensure that we're on the rising side of the power output curve.

The current gearbox is 50:1. Mini-CIM output torque is listed at 1.4 N*m. Our winch drum is 1.25'' diameter, so .625'' radius.

Neglecting friction, we have:

(150 lbs * .625'')/(1.4 N*m * 50) = ~15% of stall torque.

Now, I have really no idea how big the frictional losses actually are in this system, but I don't think there's any way they'll take us from 15% motor loading to over 50% (which is peak power, i.e. the loading for which this gearing provides optimal climb rate).

Fully-loaded climb rate (using the frictionless numbers) is somewhere around 6'' per second.

Upon reflection, we could probably gear it a bit faster (we had done the math for the gearbox when we were considering a larger-diameter winch).
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Last edited by Oblarg : 01-20-2017 at 12:15 AM.
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Unread 01-20-2017, 12:24 AM
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Re: Team 449 Climber

Your gearbox will fail you after a regional's worth of matches, maybe sooner. The aluminum ring gear will flex enough to allow the planet gears to ratchet, and you will lose the climb.
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Unread 01-20-2017, 12:40 AM
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Re: Team 449 Climber

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Originally Posted by T^2 View Post
Your gearbox will fail you after a regional's worth of matches, maybe sooner. The aluminum ring gear will flex enough to allow the planet gears to ratchet, and you will lose the climb.
Are you sure? The 50:1/mini-CIM combo is labeled as acceptable by VexPro's documentation, and as noted above we're not actually anywhere near the peak loading on it.
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