Subject:
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Re: Backlash in Lego Gear Trains
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Newsgroups:
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lugnet.technic
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Date:
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Tue, 9 Jan 2001 06:25:24 GMT
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Viewed:
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862 times
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Aren't the new style "fat" gears much tighter?
KL
In lugnet.technic, Jason S. Mantor writes:
> 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 a balance between resolution and
> accuracy. You can build two parallel gear trains and load them together
> either by introducing some "twist" on a pair of long axles or use springs or
> rubber bands to load them against each other. Either way you'll be
> introducing more friction into the system so be sure to use two technic
> beams where ever you support a shaft and you might want to use mineral oil
> or graphite or some other benign lubicant.
> Technic chains won't be very accurate unless you get them to run real
> tight. Unfortunately that usually seems to be so tight that you'll bend
> your axles and create a lot of friction.
> I've played around with using multiple sets of belts and pulleys to get
> a speed reduction and smooth motion and it'll work OK if you're not driving
> anything with it, but once you start putting enough load on it to stretch
> the rubberbands you'll get the various stages to start oscilating and
> that'll really play hell with accurate positioning. (if only we had some
> good stiff timing-belts and matching pulleys that would fit on technic
> shafts...)
>
> "Chris Mattson" <mattson@byu.edu> wrote in message
> news:G6rFFx.JM8@lugnet.com...
> > Fellow Lego Engineers,
> >
> > Does anybody have a good solution to the ever-so-common problem of • backlash
> > in lego gear trains?
> >
> > Help,
> > Chris Mattson
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Message has 1 Reply:
 | | Re: Backlash in Lego Gear Trains
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| (...) Yes, I think so. In fact, I think they have significantly more friction when grinding than the "old" gears. And by the way, when using both the new and old style gears in a gear train, I find that there is almost too much friction. Do anybody (...) (24 years ago, 10-Jan-01, to lugnet.technic)
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Message is in Reply To:
| | Re: Backlash in Lego Gear Trains
|
| 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 (...) (24 years ago, 9-Jan-01, to lugnet.technic)
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