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(...) Last week I built a little non-robot vehicle using four of the new internally geared-down Technic 9v motors. Two of the motors were connected directly to the wheels, the other two motors served as human-cranked generators to power the motors (...) (25 years ago, 29-Oct-99, to lugnet.edu, lugnet.technic)
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| | Re: lego Technic "class"
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(...) One other idea on that same line of thought -- the very first thing I wanted to do as soon as I got the two motors hooked together and working (which really only takes a couple of seconds) was to make the wire longer -- to put more distance (...) (25 years ago, 29-Oct-99, to lugnet.edu, lugnet.technic)
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| | Re: lego Technic "class"
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I've thought about using two motors for steering. Do they turn at exectly the same rate? (25 years ago, 29-Oct-99, to lugnet.edu, lugnet.technic)
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| | Re: lego Technic "class" ( About Motors )
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Todd, the stuff with the motors is Very interesting. A friend has two small motors/generators with cranks that he bought at some expensive educational materials store for about $25 I think. They run small pilot lamps well, and can do the (...) (25 years ago, 29-Oct-99, to lugnet.edu, lugnet.technic)
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| | Re: lego Technic "class"
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(...) I had a chance to play with Todd's creation for awhile. It was really cool! (The best part was the 20-foot control tether that he made so that it could be operated from a balcony high above.) I thought the controller was cool too -- to get the (...) (25 years ago, 29-Oct-99, to lugnet.edu, lugnet.technic)
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| | Re: lego Technic "class"
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(...) Generally not. I've built robotic platforms that use a pair of motors to drive the wheels so that the robot can move "straight" or turn in place. I've found that the motors typically have large variations in speed that make the robot veer to (...) (25 years ago, 29-Oct-99, to lugnet.edu, lugnet.technic, lugnet.robotics)
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| | Re: lego Technic "class"
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From: "Chris Phillips" <chris.phillips@comp...oards.com> (...) I've (...) the (...) I've (...) far. The adder/subtractor is an all mechincal design which handles this flaw. Take a look at (URL) I'm sure that others will chime in with their designs (...) (25 years ago, 29-Oct-99, to lugnet.robotics)
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| | Re: lego Technic "class"
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(...) *snip* As a somewhat Bizzare experiment, I have run a LEGO motor from the battery box controller as supplied with motor set 8735. The motor is placed next to a Pick-up on an electric guitar plugged into an electronic tuner. With the motor (...) (25 years ago, 29-Oct-99, to lugnet.robotics)
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| | Re: lego Technic "class"
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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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| | Re: lego Technic "class"
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(...) Cool! I'd never thought of doing that. Just showed it to my daughter and she was very interested and we had a good conversation about motors and generators a a result. I'll show the kids when I go in next week and see what results. Kevin (25 years ago, 30-Oct-99, to lugnet.edu, lugnet.technic)
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| | Re: lego Technic "class"
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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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| | Re: lego Technic "class"
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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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| | Re: lego Technic "class"
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Stephen, I have had one RIS motor fail shortly after first use, apparently developing a shorted armature winding. Symptom: hard to rotate fast by hand. OK very slow. Under power: ran rough and slow, made humming noise I suspect was once-per-motor (...) (25 years ago, 1-Nov-99, to lugnet.robotics)
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| | Re: lego Technic "class"
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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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| | Re: lego Technic "class"
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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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| | Halloween colors (was: Re: lego Technic "class")
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(...) g'heh -- you should've heard what the folks in Halloweenland had to say about the sky blue color scheme that they had to suffer through for a whole day in exchange... :) --Todd (25 years ago, 2-Nov-99, to lugnet.off-topic.fun)
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| | Re: Halloween colors (was: Re: lego Technic "class")
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(...) Really? I would have thought that they wouldn't say "boo!" (25 years ago, 2-Nov-99, to lugnet.off-topic.fun)
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| | Re: Halloween colors (was: Re: lego Technic "class")
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(...) Wow, those pumpkin colors had me worried for a while. Thought I had been staring too long at those little yellow and red bricks. Made me check my video cable too. The last time I saw such colors was when one of the pins in the video connector (...) (25 years ago, 2-Nov-99, to lugnet.off-topic.fun)
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| | Re: lego Technic "class"
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(...) When I first noticed the motor/dynamo effect I used it to create a puppet "Furby" driven by cams. It's on my Mindstorms page: (URL) (25 years ago, 2-Nov-99, to lugnet.edu, lugnet.technic)
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| | Re: lego Technic "class"
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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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| | Re: lego Technic "class"
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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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| | Re: lego Technic "class"
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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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| | Re: lego Technic "class"
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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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| | Re: lego Technic "class"
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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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| | Re: lego Technic "class"
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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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| | Re: lego Technic "class"
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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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