Subject:
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Re: Length of Diagonal Spreadsheet
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Newsgroups:
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lugnet.robotics
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Date:
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Sun, 8 Apr 2001 04:29:52 GMT
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Viewed:
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704 times
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In lugnet.robotics, sjbaker1@airmail.net writes:
> Gustav Jansson wrote:
> >
> > I just created a spreadsheet that I think will be useful to many of us. It
> > shows the lengths of possible diagonals in terms of LEGO Units.
>
> For gear spacings, you might try:
>
> http://web2.airmail.net/sjbaker1/lego/gearpairs.html
>
> > My testing shows that errors as great as 5% are usually no problem for
> > gears.
>
> That *can't* be right. The tolerable error for two 40t gears is no
> different from the error for two 8t gears - so it's certainly NOT a
> percentage of the distance between axle centers.
Thanks for the link to your gear spacing site. That is sort of what I was
looking for though in my chart I aimed at being more general then just a
list of workable gear spacing. My diagonal measurements can also be used to
find workable beam diagonals.
The way I used percentages in my chart is perhaps not clear and, I admit, a
bit unstandard. The percentage represents a fractions of one LEGO Unit, not
the entire distance. So when I say en error of 5% then that means 5% of one
stud length (I call LEGO Unit). One reason why I show percentages in my
chart, as opposed to just stating, what works and what doesn't, is because
for different applications different tolerances are acceptable. I let you
be the judge.
Like someone else said, the 12 tooth is a double bevel gear, as is the 20
tooth gear. They can both be used very well as spur gears. The unusual
thing about these gears is the radius. The 12 tooth gear has a radius of
.75 LEGO Units and the 20 tooth gear has a radius of 1.25.
Gus
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Message has 1 Reply:
 | | Re: Length of Diagonal Spreadsheet
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| (...) Yes - I have such a table too - but I generated it with a program that automatically rejects unusable combinations to generate a small list of useful diagonals. (...) Ah! That makes more sense. So you mean errors of 0.05 studs - that's a bit (...) (24 years ago, 8-Apr-01, to lugnet.robotics)
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Message is in Reply To:
| | Re: Length of Diagonal Spreadsheet
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| (...) For gear spacings, you might try: (URL) My testing shows that errors as great as 5% are usually no problem for (...) That *can't* be right. The tolerable error for two 40t gears is no different from the error for two 8t gears - so it's (...) (24 years ago, 8-Apr-01, to lugnet.robotics)
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