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pic: Banebot P60 Failure
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Re: pic: Banebot P60 Failure
Another thing to look out for is the roll pins that hold the outer ring gear to the front plate. The wall on the roll pin holes bend and lets the flats on the ring gear slip which ends up rounding the whole front of the gear. I can see it already happening to this gearbox.
Install a torque limiting sprocket to take care of some of that shock load at ends of travel if your using chain. |
Re: pic: Banebot P60 Failure
This is copied directly from the Banebots P60 64:1 RS550 page.
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Re: pic: Banebot P60 Failure
We stripped our 256:1 today also....
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Re: pic: Banebot P60 Failure
That's a shame considering how long they take to get...
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Re: pic: Banebot P60 Failure
we did that to a 144-1 p80 once, made quite a lot of rattle. we used 81-1 and then a 3-1 chain reduction to solve this problem (it will take 10 times what we expect.)
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Re: pic: Banebot P60 Failure
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Our mechanism is designed so that the gearboxes themselves should never "see" more than 15-20ft-lbs of torque. The majority of the damage done to these gearboxes was done when I was testing an arm fix and went from full speed up to full speed down, something that the operator does not do in competition. |
Re: pic: Banebot P60 Failure
Out of curiosity, did you have the end of the shaft supported?
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Re: pic: Banebot P60 Failure
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Re: pic: Banebot P60 Failure
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I believe that the gearbox failed during testing of our aluminum lower link fix. The arm is geared to approximately 90* per second max speed, and at that speed I abruptly reversed the arm causing one of the gearboxes to fail. We plan on limiting the speed of the arm once all of the sensors are installed so that this can not happen again. Strangely enough the arm was put through nearly 40 cycles after that test and there was some binding when un-powered, but powered the arm worked fine. |
Re: pic: Banebot P60 Failure
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High reduction banebots gearboxes are a bad idea, I'd solve it before ship. |
Re: pic: Banebot P60 Failure
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Re: pic: Banebot P60 Failure
What is the overall ratio? How heavy and long is the arm? Is it counterbalanced?
I'm just curious about the conditions prior to failure. We have a similar implementation using a BB 81:1 gearbox and have beat on it pretty hard over the last two days. We haven't experienced any problems yet, but if our implementation is similar to your, I may tear the gearbox apart and take a peak inside. |
Re: pic: Banebot P60 Failure
Dustin,
Aren't you already slowing down the arm in software? All you need is another stage of chain reduction and you'll dramatically decrease the load on the gearbox, increase the output torque on the arm, and fix every problem you have. |
Re: pic: Banebot P60 Failure
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I just want to say that they did not fail under "normal" use, they failed during a test in which I tried to get them to fail. I cycled our arm at the highest load point from 100% forward to 100% backwards a half dozen times before getting any sort of play in either transmission. One transmission failed, while the other was fine. (The drive sprocket for the arm was not tightened properly during re-assembly which appears to have caused one side to see more force than the other, but I'm not sure). Note: This picture wasn't meant to start a discussion about our system, but to provide a visual record of a failed P60. |
Re: pic: Banebot P60 Failure
Our failure point was those spring pins getting torqued off the flats also. All the gears are fine. We removed the spring pins and drilled out the pin holes for larger pins going deeper into the face plate. Then put divots where the pins interface the flats for the pins to seat in. Seems better than new this way and running good now.
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Re: pic: Banebot P60 Failure
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Re: pic: Banebot P60 Failure
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Extra chain reduction and some surgical-tubing counterbalancing could solve your problem. BaneBots gearboxes work much better when you treat them nicely... |
Re: pic: Banebot P60 Failure
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I'm also going to look into the modification that Swampdude suggested and see if we're able to do it in our shop. |
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