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-   -   How many seconds to climb the rope? (http://www.chiefdelphi.com/forums/showthread.php?t=154190)

norabaccam 24-01-2017 17:31

How many seconds to climb the rope?
 
My team has been working on our rope climbing mechanism, and we are curious of how many seconds of the 30-second time limit you guys think your robot will take to climb the rope :deadhorse:

liz.nelson.208 24-01-2017 17:40

Re: How many seconds to climb the rope?
 
This many: :deadhorse:

bearbot 24-01-2017 18:14

Re: How many seconds to climb the rope?
 
Right now we comfortable with 15 seconds but we're working on a faster method as right now.Our goal is between 5-10 seconds for CHS districts championship

frodobaggins05 24-01-2017 18:31

Re: How many seconds to climb the rope?
 
Quote:

Originally Posted by bearbot (Post 1635815)
Right now we comfortable with 15 seconds but we're working on a faster method as right now.Our goal is between 5-10 seconds for CHS districts championship

How did you get it to climb?

D_Price 24-01-2017 18:36

Re: How many seconds to climb the rope?
 
We are sitting right at about 9 seconds climbing but are looking to push it a little farther once everything is built into the robot.

Ari423 24-01-2017 19:10

Re: How many seconds to climb the rope?
 
Are we talking about just time spent physically moving up the rope or including time to align? It will probably take use a good 20+ seconds to line up and climb, but the actual climb should only take ~4 seconds (according to the JVN calc).

Richard Wallace 24-01-2017 19:33

Re: How many seconds to climb the rope?
 
  • The touch pad is 58 inches from the floor.
  • A robot attaching to the rope 23 inches from the floor must raise itself 35 inches to reach the touch pad.
  • The energy required to raise a 150 lb robot 35 inches is about 600 Joule.
  • One CIM motor can operate at >300 Watt output power for a few seconds.
  • => Two CIM motors can deliver 600 Joule in about one second.

If mechanical efficiency is high enough, a climbing mechanism powered by two CIM motors can complete the lift in about one second, after the attaching to the rope. Some mechanisms might be made even faster, by attaching to the rope at a greater initial height.

Time required to reach the rope and attach will be the limiting factor on how many seconds a drive coach will need to allow at the end of a match.

norabaccam 24-01-2017 19:52

Re: How many seconds to climb the rope?
 
Quote:

Originally Posted by Ari423 (Post 1635847)
Are we talking about just time spent physically moving up the rope or including time to align? It will probably take use a good 20+ seconds to line up and climb, but the actual climb should only take ~4 seconds (according to the JVN calc).

Talking about the actual climb. My team was planning to climb the rope definitely under 10 seconds, and I agree that lining up may take a while.

cad321 24-01-2017 22:18

Re: How many seconds to climb the rope?
 
We're currently climbing in ~6 seconds. Hopefully a little less by the end of the build.

MrForbes 24-01-2017 23:46

Re: How many seconds to climb the rope?
 
we plan on about 5 seconds for a climb. We'll see what happens...still figuring out what the robot will weigh. I think today's test with a light robot simulator was less than 5 seconds.

OMGRobots1 25-01-2017 00:47

Re: How many seconds to climb the rope?
 
We tested on a ~40 pound robot, and it was well under 5 seconds, probably around 3. We intend to keep it under 5 seconds on the real robot.

D_Price 25-01-2017 01:47

Re: How many seconds to climb the rope?
 
I feel like that will be the golden ticket for Regionals at least. ::ouch::

Quote:

Originally Posted by OMGRobots1 (Post 1635996)
We tested on a ~40 pound robot, and it was well under 5 seconds, probably around 3. We intend to keep it under 5 seconds on the real robot.


Basel A 25-01-2017 01:55

Re: How many seconds to climb the rope?
 
Quote:

Originally Posted by Richard Wallace (Post 1635855)
  • The touch pad is 58 inches from the floor.
  • A robot attaching to the rope 23 inches from the floor must raise itself 35 inches to reach the touch pad.
  • The energy required to raise a 150 lb robot 35 inches is about 600 Joule.
  • One CIM motor can operate at >300 Watt output power for a few seconds.
  • => Two CIM motors can deliver 600 Joule in about one second.

If mechanical efficiency is high enough, a climbing mechanism powered by two CIM motors can complete the lift in about one second, after the attaching to the rope. Some mechanisms might be made even faster, by attaching to the rope at a greater initial height.

Time required to reach the rope and attach will be the limiting factor on how many seconds a drive coach will need to allow at the end of a match.

Yep. Why climb slow when you can climb fast?

pmattin5459 25-01-2017 04:33

Re: How many seconds to climb the rope?
 
I think that the goal is less than 5 seconds for a relatively light 'bot. Alignment might take more time, depending on how well the mechanism grabs on to the rope, but there are so many different ways to attach onto a rope that it'll be relatively easy to find an optimal solution.

GeeTwo 25-01-2017 07:41

Re: How many seconds to climb the rope?
 
I saw a post where a team is using a single BAG and expects a 4 second climb. With proper gearing and level winding, the numbers make sense.

When you plan your start time, don't forget to account for the one-second hold - you need to be depressing the touchpad by T=1.


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