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#1
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Re: Climb Stopping Mechanism
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Hope your knot holds. |
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#2
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Re: Climb Stopping Mechanism
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#3
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Re: Climb Stopping Mechanism
I'm missing something here - isn't this something everyone has to worry about?
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#4
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Re: Climb Stopping Mechanism
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That's probably a decent amount of force (at least 300 lbs) |
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#5
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Re: Climb Stopping Mechanism
Hence the need for sensors.
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#6
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Re: Climb Stopping Mechanism
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However, in this circumstance, the force applied on the rope after hitting the stop at the top isn't "the full power of the winch + the weight of the robot pulling on the rope..." Rather, it's the maximum of the two. (Which is likely to be the "at stall" torque from the winch.) Last edited by Ken Streeter : 03-02-2017 at 17:44. |
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#7
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Re: Climb Stopping Mechanism
We're using a flex-head ratcheting wrench, i.e. just an ordinary ratcheting wrench except there's a pivot between the head and the handle. In order to lower the robot, we simply undo the velcro strap holding the wrench handle in a constrained position (i.e. between two bolts) and pivot it out of the way. The wrench rotates with the winch as it unspools.
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#8
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Re: Climb Stopping Mechanism
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Quote:
Last edited by GeeTwo : 03-02-2017 at 21:52. |
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#9
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Re: Climb Stopping Mechanism
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For those who are interested, this is the wrench in question: https://www.amazon.com/TEKTON-WRN570...words=WRN57010 |
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#10
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Re: Climb Stopping Mechanism
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I'll second the comment about marking which side of the wrench needs to be facing out, or which way the switch needs to be flipped if you're using a reversible wrench. Drill it into your pit crew's and drive team's heads. You can never double-check too many times. |
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#11
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Re: Climb Stopping Mechanism
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Depending on where it is in the gear reduction and the spool diameter it'll either be completely locked and tough to remove or trivial to remove by hand. |
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#12
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Re: Climb Stopping Mechanism
The wrench is right on the spool shaft, and the spool diameter is 1.25''. It's got a nice long handle, and I seriously doubt it will be a problem though we have not tried "wedging" the robot like that yet (we will be current-limiting the climbing motor to prevent that, at any rate).
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#13
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Re: Climb Stopping Mechanism
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#14
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Re: Climb Stopping Mechanism
After reading all this, maybe it would just be better to climb early and let the robot backdrive as time expires... This seems tricky otherwise.
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#15
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Re: Climb Stopping Mechanism
Hmm... I wonder if you could build a slip knot into the Retaining Feature of the rope. It holds under tension, but after a match, make sure the robot is supported and release an inch or two of slack. It'd be all in the rope, so even the teams that show up without the slightest consideration of this issue can implement a solution.
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