Quote:
Originally Posted by Al Skierkiewicz
I know you can't see it in the video but your coupler got into a resonant mode where the parts were vibrating independent of the lead screw. When the resonance hit the right part of the coupler, the stresses increase significantly. That is why you had parts of the coupler deform more than other parts.
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Hun interesting. I just assumed that parts were more deformed because it was able to bend such a large angle and a certain ring section failed before the others.
After the fact we looked up the length of exposed threaded rod that would lead to resonance at our diameter and found out that we were WAY over the limit. This mechanism was nick named the "Garbage Disposal" shortly after due to the noise.
Quote:
Originally Posted by Chris Fultz
Your initial question was if the part from China was as good as a part from other suppliers. I have an opinion, but i don't think this test can validate yes or no because the part was used well beyond what it is designed for.
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Yeah, the McMaster one would have to be
significantly stronger in order to make it usable for this application. I'm thinking that any helical coupler like this just isn't going to get the job done. We will have to stick with our giant solid piece of aluminum that we used during the season.