Subject:
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Re: Strengthening Gears
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Newsgroups:
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lugnet.robotics
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Date:
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Tue, 5 Mar 2002 19:04:57 GMT
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Original-From:
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Brian Smith <brian.smith@^IHateSpam^ci.seattle.wa.us>
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Viewed:
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787 times
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It appears a great way to test this would be to use a simple torque wrench. Use
a metal axle, (to show stress at this connection). A metal axle will also not
twist to give a false reading on the wrench. Fix a point at the gear teeth.
Loading up the gear to failure will give actual data on the differences. Using
another torque wrench on the teeth will give the load thru the gear...but would
not be of any use (unless not knowing that will cause you to loose sleep)
If hardening the plastic is anything like metal, you would expect the gear to be
tougher, but more brittle. While in the plane of the gear this would be fine,
any mechanism which would induce out of plane stresses would not do as well with
the 2 way shear. Also, the gear would be better under constant strain, but the
shock of start or stop under load could be reduced.
Have fun (I dont have any spares or I would be giving you the data)
> > > Tobbe Arnesson <tnt@arnesson.nu> 03/05/02 10:18AM >>>
FUT: lugnet.technic
On Tue, 5 Mar 2002 00:02:51 GMT, "Thomas Avery"
<thomas.avery@intec-hou.com> wrote:
> I recently received an email from someone about strengthening gears. This
> person claims that by boiling the gears and then cooling them with cold
> water, their strength will increase.
>
> Has anyone tried this? What were your results?
There's a lot of talk and little workshop here.
I know nothing about gear streangth, I have never broken a gear -
unitl today.
Feeling the only way to settle this is to actually test it:
1) I took a z16 gear and boiled it in five minutes, I live at an
altitude of aprox. 200 meter above sea level so the water should have
been around 100 degrees Celcius.
2) I put the gear in cold water
3) I could see no changes on the gear
4) I made a device alowing me to put a lot of stress on the gear
meshing with another z16 picked at random in my collection
5) After a few turns (got a soft axle) a "snap" was heard and there
was pieces falling... from the non-boiled gear!
6) I repeted the test and the non-boiled gear gave in after half a
twist.
7) Another try, this time moving the doped (boiled) gear to the other
position in the device, just to make sure there was no difference in
where the gear was. And again the non-boiled gear broke.
At this stage, when the doped gear hold for three non-doped gears I
thougth it was enough. Of course I should have boiled three gears and
made sure there was no difference there but...
Pictures: http://www.brickshelf.com/cgi-bin/gallery.cgi?i=132064
I have them in full resolution if needed.
/Tobbe
http://www.arnesson.nu/lotek/
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