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  #16   Spotlight this post!  
Unread 25-01-2017, 07:55
cad321 cad321 is offline
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Re: How many seconds to climb the rope?

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Originally Posted by GeeTwo View Post
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.
Don't forget though that this 1 second doesn't have to be entirely during teleop. As long as you start while still in teleop (even say in the last 0.1 second) you still get the 50 points as long as you've held it for that whole 1 seconds.
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Unread 25-01-2017, 08:14
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Re: How many seconds to climb the rope?

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Originally Posted by cad321 View Post
Don't forget though that this 1 second doesn't have to be entirely during teleop. As long as you start while still in teleop (even say in the last 0.1 second) you still get the 50 points as long as you've held it for that whole 1 seconds.
Correct. See 5th option from top of the graph in game manual.
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Unread 25-01-2017, 08:16
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Re: How many seconds to climb the rope?

When we set the rope properly, it takes about 7 seconds to lift 150 pounds using a Mini CIM and a 50:1 VersaPlanetary.
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Unread 30-01-2017, 20:13
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Re: How many seconds to climb the rope?

Here's a test with a 100:1 VP and a 775pro on our 2016 robot (nearly at the weight limit)

https://www.youtube.com/watch?v=VyNp-fGKJDk
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Unread 30-01-2017, 20:27
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Quote:
Originally Posted by bobbysq View Post
Here's a test with a 100:1 VP and a 775pro on our 2016 robot (nearly at the weight limit)



https://www.youtube.com/watch?v=VyNp-fGKJDk


Did you have any other gearing or just the775pro into the 100:1 VP? That's what we're thinking of doing.


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Unread 30-01-2017, 20:37
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Re: How many seconds to climb the rope?

15
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Unread 30-01-2017, 20:38
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Re: How many seconds to climb the rope?

Our team agreed to not go into much details, but after dozens of tests over the past week, our slowest climb was 11 seconds and our fasts was tonight at 3 seconds. We are averaging around ~4.5 seconds.
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Unread 30-01-2017, 20:42
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Re: How many seconds to climb the rope?

Considering that our climber is powered by two miniCIMs with a gearing of 100:1 and the possible weight of our bot, I think the students calculated something around 4 seconds. The final component still needs to get built, so we'll see if our testing shows us a potential climb of less than or greater than 4 seconds.
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Unread 30-01-2017, 20:51
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Re: How many seconds to climb the rope?

Quote:
Originally Posted by IceStorm View Post
Did you have any other gearing or just the775pro into the 100:1 VP? That's what we're thinking of doing.


Sent from my iPhone using Tapatalk Pro
We had no other gearing, other than a 1:1 chain that was a holdover from its days as an intake.
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Unread 30-01-2017, 21:32
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Re: How many seconds to climb the rope?

Quote:
Originally Posted by bobbysq View Post
Here's a test with a 100:1 VP and a 775pro on our 2016 robot (nearly at the weight limit)

https://www.youtube.com/watch?v=VyNp-fGKJDk
Thanks for posting test footage!

What is the diameter of that spool that the strap is winding around? Also it sounds like you have some kind of speed control on the motor, have you tried going 100% throttle as it climbs up?

With a 100:1 reduction on a 775 and a full weight robot, you'll start to draw more than 40 amps when you're spool reaches about 2.5" in diameter (which is kind of the limiting factor with the breakers, but they won't pop immediately if you go over 40 amps). With that size of spool it should take just over 2 seconds to span the distance from the top of the robot to the davit.

As you make the spool smaller in diameter, the motor will draw less current (you're electronics system will be happier) but your climb will be slower.

Be careful not to let the magic smoke out of the motor!
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Unread 30-01-2017, 22:44
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Re: How many seconds to climb the rope?

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Originally Posted by Boltman View Post
15
15? What gearing and motors are you using? That seems like a rather long period of time, and you have to also leave time to catch onto the rope. I would suggest getting your time a little bit lower, perhaps under 10.
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Unread 30-01-2017, 22:55
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Re: How many seconds to climb the rope?

We vary between about 6 and 8 seconds, using a big ol' CIM motor. Overbuild and add complexity!

Those teams that use Bag motors to climb scare me. *shudders*
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Unread 31-01-2017, 01:42
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Re: How many seconds to climb the rope?

5920 is looking under 12 for Week 1 District.
Under 9 for Week 3 District,
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Unread 31-01-2017, 09:31
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Re: How many seconds to climb the rope?

According to our calculations, using a CIM with a 64:1 BB220 gearbox, and assuming a 150 lb robot (this includes bumpers and battery) we should be able to climb in ~4 seconds. Given that it'll take a little bit to line up I expect that we'll be able to get the 50 points if we start the attempt with 15 seconds remaining in the match.
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Unread 31-01-2017, 09:44
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Re: How many seconds to climb the rope?

I think why you are seeing such long climb times is that you are not properly gearing your CIM/mini-CIM motor. Remember that a motor's maximum power output (watts) is usually roughly around 50% load. Not accounting for friction and other factors, one should be able to climb in 2-3 seconds with only a mini-CIM -- at least according to our calculations.

For reference, we are using a 1 3/4" winch with a 20:1 gearbox and a mini-CIM. If this isn't fast enough, we can easily upgrade to a full CIM.
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