![]() |
Position of Eye Bolt
Hello everyone,
Does anyone know where exactly the eye bolt needs to go? Or can it go anywhere (on the frame)? ~4294 |
Re: Position of Eye Bolt
Make sure it's toward the center of gravity.
|
Re: Position of Eye Bolt
thanks!
|
Re: Position of Eye Bolt
Quote:
|
Re: Position of Eye Bolt
Quote:
|
Re: Position of Eye Bolt
Quote:
|
Re: Position of Eye Bolt
I agree that the eyebolts should be above the center of gravity, which leads to the question of orientation. We're concerned about how inspectors will interpret this.
Quote:
Our robot climbs the outside of the pyramid corner on its belly. We put the eyebolts near the front corners of the chassis, so that if the robot were to slip and be supported by the belay ropes, it would pretty much stay safely in place. One interpretation of "near the balance point" might lead us to put the bolts on the sides around the geometric center of the robot. In that case, if the robot were to slip, it would suddenly try to level itself. It would swing down, past level, and oscillate until something dampens the oscillation. That something might be a body part near that height, such as a head. So, I think we're following a safer interpretation of the rule. Do you think inspectors will see it that way? |
Re: Position of Eye Bolt
Quote:
|
Re: Position of Eye Bolt
The robot latches onto the top rungs, using hooks near the front of the robot. So, it must be lifted 1-2" in its tilted orientation, and pulled away from the pyramid that way. We have found that it's easiest to keep it tilted that way as it is lowered, usually setting the rear bumper on the floor first, then setting the front down. This is the least strain on the lifters' backs (makes it easy to bend knees instead of waist & back), safest for people and robot.
|
Re: Position of Eye Bolt
You don't need to use an eye bolt if you are short on weight. What my team did (Team 3044) is we used Dyneema rope that was tied around one of our cross supports on our frame. It might be questioned by the judges, but there is no rule against using it in the manual, so it should be fine. It specified that it can hold 1600 pounds (so we can hold numerous robots).
|
Re: Position of Eye Bolt
Quote:
Referees wear black and white stripes Inspectors wear yellow hats. I guarantee the judges will not be asking about your belay connection points, but the inspectors will. |
Re: Position of Eye Bolt
I would expect inspectors to not accept rope for the belay points, no matter how strong it is. R10-D says that the attachment points must be made from exposed structural members that will allow a rope to be wrapped around it. IMO, rope is not a structural member. You might want to submit that to the Q&A.
I'm still concerned about the position of our eye bolts, per my post above. I may need to submit a Q&A for that. |
Re: Position of Eye Bolt
Quote:
That said, you may be questioned as inspectors will be looking for them to be near the center of gravity, and will be inspecting it while it's sitting on the floor. If you explain how its safer and demonstrate the robot removal process for them (at the practice field?), I would personally be surprised if you were forced to change the belay points to some place that makes the robot less stable (and thus less safe) while lowering it. Of course, this is all based on your description, without having seen the robot, how it climbs, or how you remove it from the pyramid. Actually seeing the process is what would form my decision. |
Re: Position of Eye Bolt
Thanks, Jon. That's really helpful, and encouraging.
Any comment on using rope as an attachment point, as someone else posted above? |
Re: Position of Eye Bolt
Being an Eagle Scout and having done some rock climbing and rappelling, I can say that rope is only as strong as the knot that holds it together. A rope rated to 1600 lbs instantly gets a rating of 0 lbs if the knot pulls out.
That said, I would refer to R10, part D: Quote:
|
| All times are GMT -5. The time now is 17:25. |
Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Copyright © Chief Delphi