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(...) Aha, the penny drops. I have two of those (grey) from one of the old gear sets as well, pretty much all that remains from these sets. I enjoyed them at the time too, but when the Technic stuff came out, well, that was that... Jennifer Clark (25 years ago, 9-Jan-01, to lugnet.db.inv, lugnet.general, lugnet.technic)
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| | Make-your-own differential
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A while ago, I saw a post about constructing a working differential out of standard parts (i.e. medium sized pulleys, connector pegs and *no* gears). I cannot find the post and I was wondering if anyone knows how to do it. (25 years ago, 9-Jan-01, to lugnet.technic)
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| | Re: Backlash in Lego Gear Trains
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(...) backlash (...) You may find some answer in a post where I explained how Paolo Masetti won the line following robotics contest during Italian Legofest IV. One of Paolo's robot key feature was the reduced backlash in the steering gear train. (...) (25 years ago, 9-Jan-01, to lugnet.technic)
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(...) Yeah, there are a couple of those in this set. The grey brick was used to hold the axles for those red spoked wheels and the really neat tracks. I just recently purchased a copy of set 404, which is pretty much identical to 912. Why are there (...) (25 years ago, 9-Jan-01, to lugnet.db.inv, lugnet.general, lugnet.technic)
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(...) I was(am) lucky enough to actually have it :) Hate to rub it in, but it was indeed a great set and I spent hours with it as a child. In many ways it was a pre-technic set (I think there was no Technic theme back in 1976) with axles, motor, (...) (25 years ago, 9-Jan-01, to lugnet.db.inv, lugnet.general, lugnet.technic)
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| | Re: Backlash in Lego Gear Trains
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Give Bob Fay an email rfay@we.mediaone.net a lot of his models have to deal with gear bcklash accurately . Perhaps get him to reply to your post here (if his response doesn't beat this post). (URL) Mattson" <mattson@byu.edu> wrote in message (...) (25 years ago, 9-Jan-01, to lugnet.technic)
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(...) I still remember looking longingly at the catalogue at this set. I still am, boy do I want a 912 now. junior (25 years ago, 9-Jan-01, to lugnet.db.inv, lugnet.general, lugnet.technic)
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| | Re: How rare is...
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(...) A 2x4 brick? (25 years ago, 9-Jan-01, to lugnet.general, lugnet.technic)
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Thanks all. I got my answer. It was an extra from my Space Shuttle. Heres another one a BRICK with Technic axle holes in ALL sides. -- Kenneth A. Drumm Ph.D. (25 years ago, 9-Jan-01, to lugnet.general, lugnet.technic)
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(...) There are two 5.5 with stop and one #12 (or was it #10?) in ZNAP set 3521: (URL) of the sets I bought had a damaged long axle, I'll take som photos of it. It's been ruined in the mold or while still warm. (I bought two copies to get four 6582 (...) (25 years ago, 9-Jan-01, to lugnet.general, lugnet.technic)
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| | Re: Backlash in Lego Gear Trains
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Aren't the new style "fat" gears much tighter? KL (...) (25 years ago, 9-Jan-01, to lugnet.technic)
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| | Re: Backlash in Lego Gear Trains
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Try to measure the quantity you are interested in as directly as possible. If you have to count rotations do it at the output of the gear train not the input. For a given quality of gear (TLC's gears are certainly not AGMA 10s !) you have to strike (...) (25 years ago, 9-Jan-01, to lugnet.technic)
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| | Re: Backlash in Lego Gear Trains
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(...) If you are building a scanning thing, this works really well. I built a camera that used the Lego light sensor, and I would get zig-zags between scan lines. I changed the software to wind it all the way back and scan from the same direction (...) (25 years ago, 9-Jan-01, to lugnet.technic)
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| | Re: Shame, Shame...."plastic" rubber tires in new technic
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The plastic wheels work well when you cannot use a clutch gear or pulley belt to protect a motor from excessive resistance. Rrubber wheels do not yield well on some driving surfaces when an obstacle stops the vehicle. Plastic wheels spin and, so, (...) (25 years ago, 9-Jan-01, to lugnet.technic, lugnet.edu)
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| | Re: Backlash in Lego Gear Trains
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Same problem. The more you try to reduce backlash, the more friction you get. ROSCO "Chris Mattson" <mattson@byu.edu> wrote in message news:G6v27B.GAn@lugnet.com... (...) (25 years ago, 8-Jan-01, to lugnet.technic)
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| | Re: Backlash in Lego Gear Trains
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If you working on a Mindstorms project, then measure your position as close to the output of your gear train as possible. This will eliminate the effect of backlash on your positioning. However if the gear train is expected to hold the final (...) (25 years ago, 8-Jan-01, to lugnet.technic)
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| | Re: Backlash in Lego Gear Trains
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Jerry, Precise positioning is my objective. And of course too much friction is a problem. I have'nt fooled around with this too much but, the LEGO gears, as designed, have too much backlash for my project (and as you suggest probably to keep the (...) (25 years ago, 8-Jan-01, to lugnet.technic)
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| | Re: Backlash in Lego Gear Trains
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Chris, it depends on your point of view. As backlash gets less and less, gear train friction gets more and more. The friction is somewhat between the gears but mostly in the shaft bearings where additional force comes to bear. Unless you need (...) (25 years ago, 8-Jan-01, to lugnet.technic)
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| | Model Team scale Lamborghini Diablo 6.0
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I believe my LEGO Diablo phase has come to an end...I think I have finally succeeded in creating a likeness (but that's for you to decide). Modeled after the latest Diablo, my LEGO rendition is fully motorized (with a geared motor and a micromotor (...) (25 years ago, 8-Jan-01, to lugnet.build, lugnet.town, lugnet.general, lugnet.announce, lugnet.technic, lugnet.modelteam) !!
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| | Re: New Roborider, Lego racers found
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(...) Agreed. The whole "virus on the web" thing on the web site doesn't really make sense. "Bikes with human brains" is passible, but there's no particular reason for it either. The dudes on the wheels is just to give us something else to buy again (...) (25 years ago, 8-Jan-01, to lugnet.general, lugnet.technic)
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