Quote:
Originally Posted by sanddrag
Do you have a picture of the application/design, or at least some specifics of how it was used? Also, what metal was that ring gear?
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Yup. The lift that actuates as the robot drives around the corner was actuated in two parts. There is a stick (that you can clearly see) that pushed the four bar up about halfway, at which point the four bar itself was actuated by sprocket attached to the front right member of the four bar.
Both of these were actuated by 256:1 Banebots gearboxes. There was also some bungee cord that was used to alleviate some of the lifting from the gearboxes.
The BB that failed was the one that actuated the 2nd part of the lift. We were just doing our final tests on Thursday night when it stopped working. We heard some terrible grinding, removed the gearboxes and saw the failure. I don't believe we took any pictures of it (at any rate, I don't have them) but a large number of the teeth had failed and there were lots of former gear teeth that had been smashed into long fragments floating about in the grease.
Worth noting was that the output shaft was cantilevered, but the sprocket was as close as humanly possible to the gearbox. We installed another gearbox & added a bearing so it became simply supported, and we did not experience another failure (realistically around 100 actuations, which is in the neighborhood of the number on the one that failed).
I don't recall what the ring gear was made of, perhaps a search of CD might turn up something? I can't find much about the old motors on BaneBots site.