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In lugnet.robotics, Stephen Unwin writes: <...snip...> (...) I've never seen this, but I recall hearing somebody discuss this recently. It might be a quality control problem having to do with adhesive getting worn off and gumming up the gears. (...) (25 years ago, 29-Oct-99, to lugnet.robotics)
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Chris Phillips wrote in message ... (...) pushing (...) Chris, Thanks for the insight! They say, curiosity killed the cat.... Good thing I'm not a cat! I opened one of my motors and took photos for everyone to enjoy. (URL) Chris, I also was unable (...) (25 years ago, 31-Oct-99, to lugnet.robotics, lugnet.technic)
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I know one thing that can ruin a motor.... Never drop it shaft down on the ground, even in dirt. I was carrying it across my yard, and it fell, and now will not work anymore. The shaft was jammed back inside the motor. If your motor will not turn at (...) (25 years ago, 31-Oct-99, to lugnet.robotics)
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(...) Nice pictures! Now Merlin, my black long-hair cat is telling me to go for it! I guess I'll have to rip into my half-dead motor to see what's inside there. Since it's not reliable, I've got less to lose by (gasp!) cutting the plastic or (...) (25 years ago, 1-Nov-99, to lugnet.robotics, lugnet.technic)
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On your web page you ask why they made the commutator so small. I think the most obvious-by-far reason is to reduce the amount of wear on the contacts due to friction. By making the radius of the commutator cylinder small, they reduce the linear (...) (25 years ago, 1-Nov-99, to lugnet.robotics, lugnet.technic)
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Hari Wiguna writes: > I opened one of my motors and took photos for everyone to enjoy. > > (URL) > > PS: Chris, I also was unable to take the guts out of the casing. Right. You can't do that without destroying the motor. > Considering that this is a (...) (25 years ago, 8-Nov-99, to lugnet.robotics)
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(...) Did the autopsie show what killed the motor? Play well! Marcus --- Marcus Fischer Mellbin E-mail: marcus no-spam-at fischer-mellbin.com (URL) (25 years ago, 9-Nov-99, to lugnet.robotics)
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Fischer&Mellbin writes: > In lugnet.robotics, lego-robotics@crynwr.com (Russell Nelson) writes: > >I autopsied a dead motor. Photos at (URL) > robotics/5225/ . > > Did the autopsie show what killed the motor? Alas, no. It wouldn't turn, but after I (...) (25 years ago, 9-Nov-99, to lugnet.robotics)
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(...) Actually, the reason I'm looking here is because I had a motor die recently for no apparent reason. It's become really difficult to turn the spindle by hand and it only gives about 100 RPM instead of the nominal 360. I HAVE found a good way to (...) (23 years ago, 14-Sep-01, to lugnet.robotics)
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| | Re: Motor Failure (was: lego Technic "class")
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(...) I have had no problems with motors purchased w/Mindstorms (RIS, RoboSports, RDS), 8735s or other motorized Technic sets. I've had about a 15% failure rate on motors from ZNAP sets. The 5225 gear motors should coast when power is removed in (...) (23 years ago, 14-Sep-01, to lugnet.robotics)
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| | Re: Motor Failure (was: lego Technic "class")
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Technic-heads, read this: (...) any seize, but I haven't used them very much either. What I have noticed is that on a few motors, when I turn the shaft slowly by hand, it will bind up unless I apply a lot of torque. It almost feels like there's a (...) (23 years ago, 14-Sep-01, to lugnet.robotics, lugnet.technic)
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| | Re: Motor Failure (was: lego Technic "class")
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(...) I've come across one gear motor that failed, but it's one I bought cheap second hand, I should be able to get my money back. I tested it before purchase and it worked but it turns out the fault is intermittant. To fix the problem you have to (...) (23 years ago, 14-Sep-01, to lugnet.robotics, lugnet.technic)
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(...) I've had 6 bad motors out of 15 or so. Some out of the RoboSports sets but non from an actual RIS or RDS. LEGO will replace the motors are no cost. Sometimes you must send in the bad motors in their return envelope. I had one motor that would (...) (23 years ago, 14-Sep-01, to lugnet.robotics)
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(...) That could be good news. Can you tell me how you contacted someone at Lego who has some good sense? Thanks (23 years ago, 20-Sep-01, to lugnet.robotics)
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(...) I've never had an issue with LEGO. My wife has. They made her send in the bad parts first, on her dime. She was pretty upset. But I've never had an issue and have never been charged. Dean (23 years ago, 20-Sep-01, to lugnet.robotics)
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