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Unread 05-02-2017, 18:30
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Re: Climb Stopping Mechanism

Quote:
Originally Posted by Oblarg View Post
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.
We tried this today. We climbed with 130lbs attached to our climber's production frame using production motors & gearing. Rope touch to Touchpad was about 4 seconds, so it wasn't a 'crash' into the top - but we did intentionally stall the motors at the top for a second or two. The ratchet wrench was held in place by one 1/4-20 bolt - the threaded end, no less. While under load we popped it loose with a large flathead screwdriver very easily. During further tests and refinement, we added a string to pop it out at the end of the tests. It also worked very well. We climbed about 30 times, and it worked every time. We'll put a 3/8" steel stud around that bolt in the future.
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