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 04:49:11 GMT
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Original-From:
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Steve Baker <SJBAKER1@AIRMAILsaynotospam.NET>
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Reply-To:
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sjbaker1@SPAMLESSairmail.net
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Viewed:
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1983 times
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Gustav Jansson wrote:
> 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.
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.
> 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).
Ah! That makes more sense. So you mean errors of 0.05 studs - that's a bit
limiting I think - with an error as big as 0.1 studs, the meshing is still
usable in most cases.
> 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.
Right - that's why I show the actual error in stud-units - so you can decide
whether you can tolerate more error in order to simplify construction or
something. I also sorted them by size of error so you don't have to search
a large table of bad meshings to find the good ones.
> 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.
Yes - once I realised you were talking about those rare double-bevel parts, I
remembered that I had a couple of them in my collection. I'd completely forgotten
about them. (They were consigned to my "Weird parts that don't belong in any other
place" storage bin :-)
The tricky thing about them is that you can get different useful meshing radii
by sliding them further along the axle.
I wish Lego had produced a 2-stud radius 32t gear to fill the gap between 24 and 40.
--
Steve Baker HomeEmail: <sjbaker1@airmail.net>
WorkEmail: <sjbaker@link.com>
HomePage : http://web2.airmail.net/sjbaker1
Projects : http://plib.sourceforge.net
http://tuxaqfh.sourceforge.net
http://tuxkart.sourceforge.net
http://prettypoly.sourceforge.net
http://freeglut.sourceforge.net
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Message is in Reply To:
 | | Re: Length of Diagonal Spreadsheet
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| (...) 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 (...) (25 years ago, 8-Apr-01, to lugnet.robotics)
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