I search for part 6797.dat

[Thorsten]

Hello

I hope that anyone of you has imitation the part 6797 for MLCAD.
Need it for the McLaren P1 as exhaust.

Partname: Technic Engine Air Scoop 4 x 4 x 1 1/3

Can you help me there?

[Philippe Hurbain]

The shape is fairly simple and easy to create, but do you have other photos from different angles? Measurements?

[Thorsten]

Yes but it is small

[Gerald Lasser]

I have this part but I need to look for it (great availability: once in Technic, three times in Belville :-)

I upload larger images and dimensions.

EDIT: OCt 14th: still looking... not in the technic bin and in the "single parts" bin...

[Gerald Lasser]

I found it! Was in "Old Gray Stuff" bin...

This part is son un-rectangular...

- The base is 4 x 4 studs extending by 1mm front and back.
- The base tapes from slightly over 4 studs (4stud + 4 LDU) at the Scoop to under 4 studs at the back (1 mm less)
- side walls are 1,2 mm, top is 1,8mm, bottom is 1,6 mm
- Around the scoop is a lip 1,4 mm wide, .2 mm high
- The part height is 13,1 mm at the back and 14 mm at the scoop (including the lip)
- Side walls are parallel.
- Radius from side to top looks to be 5mm
- Radius from the side wall to the back wall looks to be 2mm which also applies for the curve from back wall to the top.

[Philippe Hurbain]

Do you want to do the model? I can have a shot, but more good photos would really help.

[Thorsten]

I ordered one.It is still on the way. If it is there I can send you a 2D CAD as an image. I have no idea of it to make it even. so far I only share adapted in length, etc.

[Gerald Lasser]

Here's a starting point...with the raw dimensions.
The rounded stuff is a bit of a challenge, i.e. how to skew a cylinder primitive to fit...

[Magnus Forsberg]

Interesting challenge. Here's my beginning. Do you want me to continue?

[Gerald Lasser]

Here are the pictures:

   
   
   
   
   
one more to come

[Gerald Lasser]

Last one:
   

[Thorsten]

Yes, please.

[Gerald Lasser]

I need your opinion, according to the measurements I took, I cannot find an existing tori-primitive to fit, however one fits pretty close as you see in the attached file. Would that be a compromise or would a new prim be better?

Thanks

[Max Martin Richter]

Have you tried to use (new) values for the torus?

/Max

[Thorsten]

Let's try to move the Toris from 0.5 to 1 in height and right / left.

[Magnus Forsberg]

I'm almost dune. Am I reasonably right?

[Magnus Forsberg]

Done.

How do we name it? Scala Wastebin or Technic Engine Air Scoop?

[Gerald Lasser]

I tried to find one according to my measurements and how I understood their description.

I need and outer radius of 12.5 LDU, the torusbody itself has a radius of 5 LDU which gives me an inner radius of 7.5.

To choose the proper one I divide the inner radius by the tori (minor) radius, which is (12.5 - 5) / 5 = 7.5 / 5 = 0.66666

... and now I see that I did a mistake in my calculation before. the t04o6667.dat fits perfectly...

Good lesson, also Magnus has already completed it!

[Max Martin Richter]

Have you tried the programme ToriCalc? You can find it on Philo's homepage.

/Max

[Philippe Hurbain]

Looks good. I tend to prefer Technic Engine Air Scoop as it's the name on BL and Peeron for years... OTOH LEGO names it "REFUSE PAIL FOR LID"

[Thorsten]

Great job. Thanks for all. Il be happy.

And it works. Loock at the Photo

[Philippe Hurbain]

I can see a corrugated tube that's not well aligned with pin Looks nice otherwise!

[Gerald Lasser]

I agree with Philo. although only once used in Technic, thrice in Scala :-)

[Thorsten]

I know. I still have a few kleinne parts that need to be past. I'l be on beginning with stepping and grouping the Parts.

[Magnus Forsberg]

It's now uploaded to the PT with "Technic Engine Air Scoop 4 x 4 x 1.333" as description.