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 05:09:31 GMT
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Viewed:
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754 times
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In lugnet.robotics, sjbaker1@airmail.net writes:
> On the white 'slipping clutch' 24t gearwheel part is written:
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> 2.5 5.0 Ncm 2.5 5.0 Ncm
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> 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?
- Sean
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Message has 4 Replies:
 | | Re: Meaning of lettering on white gearwheel.
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| (...) I do know they seem to wear out REALLY fast and no longer work as new ones... Mine can now barely turn it's self with out slipping. Dean -- Coin-Op's For Sale!: (URL) Lego Workshop: (URL) Lego Club: (URL) (24 years ago, 16-Oct-00, to lugnet.robotics)
| | | Re: Meaning of lettering on white gearwheel.
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| (...) is (...) teeth (...) is (...) rotation (...) 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 (...) (24 years ago, 16-Oct-00, to lugnet.robotics)
| | | Re: Meaning of lettering on white gearwheel.
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| (...) teeth (...) rotation (...) As far as I can tell, the minimum "breakaway" torque would be 2.5 Ncm (which would be Newtons*cm, or 2.5 Newtons weight, hung 1 cm out, or 1 Newton hung 2.5 cm out (about .22 of a lb, at 1" radius for those of you (...) (24 years ago, 16-Oct-00, to lugnet.robotics)
| | | Re: Meaning of lettering on white gearwheel.
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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 (...) (24 years ago, 16-Oct-00, to lugnet.robotics)
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