Subject:
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Re: "33" Slope Shocker... Possible name change?
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Newsgroups:
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lugnet.cad.dev
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Date:
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Mon, 9 Apr 2001 23:47:35 GMT
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Viewed:
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1287 times
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In lugnet.cad.dev, Steve Bliss writes:
> This problem has (probably) been realized by a number of people in the last
> few years; I figured it out (or was it pointed out to me?) a few months
> ago.
>
> Yes, I am planning on doing a mass name-change, but after the automated
> Parts-Tracker is up and running.
>
> And the angle is precisely arctan(0.5), or about
> 26.565051177077989351572193720453[1] degrees.
Ouch. Now that is some number. I looked it up in both the Windows Calculator
and AutoCAD 2000 (expanding tolerance out to the smallest decimal -- hundred
millionths) to find out the your large figure rings true.
>
> For the part names, 27 is accurate enough, I think.
*huff, puff* I'm inclined to agree. I may use thousandths or millionths for
detail work but recommend that every one sticks with 27.0 degrees to relieve
stress.
>
> Steve
> 1) I'd recommend disregarding most of those decimal places -- I used the
> Windows Calculator app to produce the number.
Thanks for your helpful reply, Steve. Even if we do round off to the nearest
one, At least things will *feel* better.
James J.
>
> In lugnet.cad.dat.parts, James J. wrote:
>
> > Greetings.
> > I have made a new discovery that may seem all too obvious to everyone • else
> > who has actually programmed elements in LDraw or MLCAD. My discovery is as
> > follows:
> > All bricks listed as having a 33-degree slope are not named with correct
> > values. I always wondered what the slope on these bricks really were,
> > considering that the LEGO S.A.H.S. catalogs listed them as 25-degree slopes,
> > possibly to throw off their competitors. This was further compounded when I • was
> > not able to angle a pattern right so that it would fit onto a "Slope Brick 33
> > 3 x 2". Today, I used AutoCAD to resolve my problem. Upon creating and
> > dimensioning a replica of that piece, as well as the 4 x 2 and 2 x 2 slopes, • I
> > found out that the resulting angle was 27 Degrees. Yes, "vingt-sept".
> >
> > Now that this is known, will have a significant change on things? I • don't
> > know. I'm not even sure where the 33-degree idea came from. Maybe it was a
> > mistake that somebody missed years ago. But that mistake has become a • standard.
> > Even though the SAHS catalogs list them as 25 degree slopes (closer to the
> > magic number than 33) -- and have been for years, LCad-emics have been • building
> > to the list value of 33 degrees.
> > I would like to propose a massive name change affecting quite a bit of the
> > Slope category from "Slope Brick 33..." to "Slope Brick 27...". This will • make
> > it easier on later builders and resolve a whole bunch of confusion. It should
> > take affect starting with the next LDraw parts upgrade. Such a change will • make
> > it easier for other creators to develop "roof tiles".
> >
> > -- James Jackson
> > "The other 'James J.'"
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Message is in Reply To:
 | | Re: "33" Slope Shocker... Possible name change?
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| This problem has (probably) been realized by a number of people in the last few years; I figured it out (or was it pointed out to me?) a few months ago. Yes, I am planning on doing a mass name-change, but after the automated Parts-Tracker is up and (...) (26 years ago, 9-Apr-01, to lugnet.cad.dev)
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