 | | Avoiding motor stalls
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I broke another 9V motor. See my (URL) post> for the first story. I'm building what amounts to a pitching machine for the Great Ball Contraption. In most TECHNIC building you're building a gear train to produce lots of power at the expense of speed. (...) (19 years ago, 9-Jul-05, to lugnet.technic, lugnet.robotics, FTX)
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| | Re: Avoiding motor stalls
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I thought of something else. I'm testing this thing with an RCX, and could it be that as the batteries get weaker the motor loses power, which makes stalls even more dangerous? (19 years ago, 9-Jul-05, to lugnet.technic, FTX)
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| | Re: Avoiding motor stalls
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(...) This may not eliminate stalls, but try adding a bunch of spinning mass (i.e., a flywheel) somewhere in your gear train, preferably at the output. A big Technic tire (like from 8448 or something similar) would work nicely for this. This will at (...) (19 years ago, 9-Jul-05, to lugnet.technic)
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| | Re: Avoiding motor stalls
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Update: there are now two motors driving this thing. They each have an 8 tooth gear that turn a 40-tooth gear placed between them -- instant torque, but less output speed. I put another 40-tooth gear on the same axle as that one and connect that (...) (19 years ago, 18-Jul-05, to lugnet.technic, FTX)
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| | Re: Avoiding motor stalls
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(...) You might also use a fast 2838 motor (URL) to direct-drive the ball throwing wheel. A friend used this setup in a GBC module (URL) that worked several hours without motor problems. Philo (19 years ago, 18-Jul-05, to lugnet.technic)
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| | Summer Days & weekend GBB (was Avoiding motor stalls)
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On Mon, July 18, 2005 4:48 am, Philippe Hurbain said: (...) Hey Philo! I was looking at the 'Summer Days' pictures. It looks like you guys had a bunch of fun, but many questions came to mind. I couldn't find a good picture of the Spybot-Train-GBC (...) (19 years ago, 18-Jul-05, to lugnet.technic)
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| | Re: Summer Days & weekend GBB (was Avoiding motor stalls)
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Hello Steve! (...) Yes, it was a great time! (...) Actually the best picture is here (URL) (but all text info is in French...). More on that module on my website in some future! (I also need to add an update on my ball pump module that I tuned after (...) (19 years ago, 18-Jul-05, to lugnet.technic)
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| | Re: Summer Days & weekend GBB (was Avoiding motor stalls)
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On Mon, July 18, 2005 10:51 am, Philippe Hurbain said: (...) ... (...) What was the problem? (...) I totally understand that. You'll notice the complete lack of write-ups of most of my modules. I did come across the above page a little earlier (...) (19 years ago, 18-Jul-05, to lugnet.technic)
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| | Re: Summer Days & weekend GBB (was Avoiding motor stalls)
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(...) Minor one: the contraption I used to maintain the liftarms forming the ball tube spaced 2.5 (based on (URL)) got loose with time, now replaced with (URL) + (URL) Major one: the stirring blade was sometimes blocked by a ball half-engaged in (...) (19 years ago, 18-Jul-05, to lugnet.technic, FTX)
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| | Re: Avoiding motor stalls
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(...) Hmmmm. I have but one of the ungeared 9V motors, and I'm using it in a ball pump, but I will try swapping motors. If I geared it up just a bit to handle the 90 degree angle (8-tooth gear to 24-tooth crown gear), do you think that would be (...) (19 years ago, 19-Jul-05, to lugnet.technic, FTX)
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| | Re: Avoiding motor stalls
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(...) WOAH. I don't think I'll gear it up at all. This thing's speed is now insane! The sound it makes is actually frightening. (19 years ago, 19-Jul-05, to lugnet.technic, FTX)
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| | Re: Avoiding motor stalls
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(...) I don't think it could be dangerous for you (except perhaps a ball thrown in the eye?), but it may hurt your LEGO parts... when I dismantled my CD-launcher, one of the 2x1 Technic brick bearing the fast axle had a much bigger hole than (...) (19 years ago, 19-Jul-05, to lugnet.technic)
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