Subject:
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Re: Meaning of lettering on white gearwheel.
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Newsgroups:
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lugnet.robotics
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Date:
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Mon, 16 Oct 2000 09:32:08 GMT
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Original-From:
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John Coppola <coppola@IHATESPAMiinet.net.au>
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Viewed:
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767 times
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Ncm is the metric measure for torque, imperial is
ft/lb's
hence 5Ncm is the the amount of torque required
before the gear will 'slip', 2.5Ncm before it will
engage again. the difference is the hysterisis.
one would assume that Lego has a range of such
gears suitable for various tasks OR 5Ncm is the
amount of torque most Lego gears can bear before
'stripping'
The clutch gear is useful for example when used
with their worm gear in the yellow gearbox.
check out: http://www.tohnichi.com/whatstor.html
regards,
At 05:05 PM 16/10/2000, Mario Ferrari wrote:
> Sean Harrington <harrington@macgenius.com> wrote:
> > In lugnet.robotics, sjbaker1@airmail.net writes:
> > > On the white 'slipping clutch' 24t gearwheel part is written:
> > >
> > > 2.5 5.0 Ncm 2.5 5.0 Ncm
> > >
> > > What is the significance of this?
> >
> > I think Ncm is Newtons per centimeter, but I can't remember how a Newton • is
> > defined.
> >
> > So, if you're spinning the drive shaft, and the counter force on the gear • teeth
> > is less than 2.5 Ncm, you're fine. If the counter force on the gear teeth • is
> > 2.5 or greater, you will begin slipping, transferring exponentially less
> > rotation until you meet 5.0 Ncm of resistance, at which and beyond, no • rotation
> > is transferred at all.
> >
> > Can a real physicist jump in here and keep me from embarrassing myself
> further?
>
> I'm not a real physicist so I'm taking the risk to add confusion instead of
> knowledge :-)
> I heard that the 2.5 and 5.0 numbers refer to the threesholds the gear
> starts to slip in the two possible rotation directions, clockwise and
> counterclockwise. Actually this theory sounds reliable, as if you open the
> gear you see that this device is not at all symmetrical with regard to the
> rotation direction. It would be great if someone tests a bunch of them and
> posts some stats so we all know a bit of more of this so useful gear.
>
> Mario
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Message has 1 Reply:
 | | Re: Meaning of lettering on white gearwheel.
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| "John Coppola" <lego-robotics@crynwr.com> wrote in message news:4.3.2.7.2.20001....net.au... (...) ft-lb as in length * force (torque or moment, not to be confused with momentum which is force*time or mass*velocity) not length/force. (...) This is (...) (24 years ago, 16-Oct-00, to lugnet.robotics)
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Message is in Reply To:
| | Re: Meaning of lettering on white gearwheel.
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| (...) I think Ncm is Newtons per centimeter, but I can't remember how a Newton is defined. So, if you're spinning the drive shaft, and the counter force on the gear teeth is less than 2.5 Ncm, you're fine. If the counter force on the gear teeth is (...) (24 years ago, 16-Oct-00, to lugnet.robotics)
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