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Unread 02-12-2018, 08:56 PM
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Team 857 Active Ramp Videos

I just stumbled upon these two videos from Team 857 and thought I would share. I'm pretty sure this is the first video I've seen of working active ramps this year, very cool!

Video 1

Video 2
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Unread 02-12-2018, 11:30 PM
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Re: Team 857 Active Ramp Videos

Hey, that's us!

We based our ramp design on 1816's 2007 robot. We did find today that we'd intersect with our bumpers, so we're going to be moving the main hinge up about an inch to get it out of the way.
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Unread 02-13-2018, 12:17 AM
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Re: Team 857 Active Ramp Videos

Very cool! I had a similar idea I was mulling around week 1 of build season, however we went in a different direction. Good luck this season!
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Unread 02-13-2018, 12:22 AM
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Re: Team 857 Active Ramp Videos

I am very interested in knowing how many teams are planning on having ramps but not climbing themselves, lifting just themselves, lifting themselves and another 1 or 2 robots, or not planning on any climbing but maybe hoping to be lifted...
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Unread 02-13-2018, 06:54 AM
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Re: Team 857 Active Ramp Videos

Looks good! We just completed our ramps and are in the process of mounting. Hoping to have a reveal video sometime in the future. We are looking at a more static approach to "once the ramps are down, they are down".
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Unread 02-13-2018, 12:10 PM
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Re: Team 857 Active Ramp Videos

What's the bore size on those beasts?
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Unread 02-13-2018, 12:23 PM
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Re: Team 857 Active Ramp Videos

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Originally Posted by RoboChair View Post
What's the bore size on those beasts?
2". 1.5" wouldn't have provided enough force.
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Unread 02-13-2018, 01:49 PM
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Re: Team 857 Active Ramp Videos

Looks great! We had the same CAD for it, until we decided to forgo ramps during Week 2 Build.
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Unread 02-13-2018, 01:53 PM
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Re: Team 857 Active Ramp Videos

This is pretty clever. Are you worried that one side of your ramps is easily defended?
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Unread 02-13-2018, 02:06 PM
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Re: Team 857 Active Ramp Videos

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Originally Posted by pandamonium View Post
This is pretty clever. Are you worried that one side of your ramps is easily defended?
A little. And that on one side it may be impossible to get a tall robot through under the scale plate.
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Unread 02-13-2018, 03:05 PM
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Re: Team 857 Active Ramp Videos

Love it. Looks like a lot of our concept sketches. We abandoned pneumatics as impractical due to the huge amount of air required. But, you seem to have solved that problem. How long does it take to charge your tanks with enough air to lift both ramps?
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Unread 02-13-2018, 03:35 PM
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Re: Team 857 Active Ramp Videos

Quote:
Originally Posted by ToddF View Post
Love it. Looks like a lot of our concept sketches. We abandoned pneumatics as impractical due to the huge amount of air required. But, you seem to have solved that problem. How long does it take to charge your tanks with enough air to lift both ramps?
We haven't timed it. Each ramp only needs two of the Clippard AVT-PP-35 tanks (so four total on the robot). In testing a single ramp with two tanks, the pressure goes from ~120 psi to ~55 psi through the actuation, but it only needs maximum pressure when the roller wheel first touches the ground and decreases from there.

Our compressor will be off-board for the weight savings (and it is going to be tight).

Edit: and we're still working at how to gently lower the ramp instead of letting it free-fall.
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