Subject:
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Re: Power Pullin' With My Tractor
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Newsgroups:
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lugnet.technic
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Date:
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Fri, 25 Jan 2002 19:17:00 GMT
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Viewed:
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2766 times
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In lugnet.technic, Larry Pieniazek writes:
> In lugnet.technic, Thomas Avery writes:
>
> > Thanks for asking. You've prompted me to update my gears page:
> > http://www.texbrick.com/ideas/gears/
> >
> > At the bottom of the page, there is a section on gear breakage. I've listed
> > the different gears I've broken and the conditions in which failure occured.
> > Hope this helps.
>
> Wow, very informative page! Can you add to it what KIND of breakage you saw?
> (the failure mode) Was it tooth shearing, axle connection point failure, the
> axle itself failing, or something else? Thanks!
Thanks! Okay, try it again:
http://www.texbrick.com/ideas/gears/
I've added some pictures to the "breakage" section that show the broken
gears. I'm pretty sure that they break from the axle hole outwards. There's
a high stress concentration at the point of axle connection.
I've never seen teeth shear off, but you'll notice that one 24-tooth gear
has a crack in between the teeth, and one of the 12-tooth bevel gears had
mashed teeth.
The axles hold up during gear failure. I've never noticed any permanent
warping either. At least there's no noticeable warping.
The only time I've ever failed an axle was when I put one in a power drill
(a long time ago). Duh! Oh well, I was a stupid kid.
TJ
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Message has 3 Replies:
 | | Re: Power Pullin' With My Tractor
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| In lugnet.technic, Thomas Avery writes: Thanks for the update! (...) Long long ago, when I first got into the hobby, I was corresponding with John Gerlach about lift bridges and he reported axle failures, but it was due to shear rather than torque. (...) (23 years ago, 25-Jan-02, to lugnet.technic, lugnet.trains)
| | | Re: Power Pullin' With My Tractor
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| It's not pretty. I've sheared teeth on racks when using them for Z-axis (up/down) stages that had a fair bit of weight on them. It broke the pinions too : ( To be fair though, it was bad design on my part to use a rack and pinion for that. I should (...) (23 years ago, 26-Jan-02, to lugnet.technic)
| | | Re: Power Pullin' With My Tractor
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| Sorry for digging up an old thread ;) In the solar car I'm building (see the 'heavily modified 8880 chassis' thread) I've so far broken 3 old style 24 tooth gears. (among some old style 12 tooth crown gears, but that's no surprise really...) The (...) (22 years ago, 8-Mar-03, to lugnet.technic)
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Message is in Reply To:
| | Re: Power Pullin' With My Tractor
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| (...) Wow, very informative page! Can you add to it what KIND of breakage you saw? (the failure mode) Was it tooth shearing, axle connection point failure, the axle itself failing, or something else? Thanks! (23 years ago, 25-Jan-02, to lugnet.technic)
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