Comments on: LEGO Triangles

By: mfeldt

mfeldt — Wed, 20 May 2015 11:38:34 +0000

If the connectors are too tight and the triangle is large: The 3M liftarms can be replaced by 5M liftarms that go 2 holes further away from the corner. Or by 7M levers or bars that go 4 holes further out. Or by 9M levers that go… you get the idea.

By: Making a hexagon with plates | CL-UAT

Making a hexagon with plates | CL-UAT — Wed, 24 Dec 2014 18:04:20 +0000

[…] know they can be made with Technic struts and connectors, see this BrickEngineer post for some good […]

By: Vikram

Vikram — Sat, 14 May 2011 08:05:23 +0000

Amazing post, truly! http://skillset.com/

By: admin

admin — Sun, 24 Apr 2011 21:49:20 +0000

I not only tried them, but I have used them in several robotic designs.
The fit is indeed tight, but I have not found it to be as tight as you describe.

I would make sure that all liftarms in your design are indeed 1 x 11.
I cannot imagine how the liftarms could possibly be bending if they were the same length.
If one was longer or shorter than the others, then what you describe should indeed happen.

The critical part of the design is not the side length of the triangle, but the 60 degree angles at the three intersections.
Since these angles are the same for any equilateral triangle, the joint will work equally well with any straight liftarms as long as they are the same length.

I hope that this helps!

By: adam

adam — Sun, 24 Apr 2011 21:35:55 +0000

Great deisgn on paper – when I go to build the 11 lenght liftarm triangle using the 1/2 liftarms (1×3) and the (1×2) they are an extremely tigh fit against each other. So much force is necessary to keep the triangle aligned, that the 1×11 liftarms are actually bending in the middle – to much stress!

My chance, did you get an opportunity to build this model after desiging it on papaer to see the fit of each piece against the next peice.

The stress placed on the each piece after construciton will cause premature wear.

By: Jessie

Jessie — Fri, 11 Apr 2008 10:19:07 +0000

Jessie…

This is real good info. Thanks for sharing….

By: Rich

Rich — Mon, 14 Jan 2008 04:09:16 +0000

In an effort to keep you awake at night pondering this, how would convert your triangle concept into a model of the Gateway Arch in St. Louis?

By: admin

admin — Wed, 17 Oct 2007 03:34:11 +0000

Hi Alex,

I use the LDraw package with MLCAD to record the designs.
I then use L3PAO (part of LDraw) to generate the POV files for POV-Ray for Windows 3.5

I see that you do neuroscience research… me too!!!
http://knuthlab.rit.albany.edu/publications.html

Please let me know if you have other questions.
Cheers,
Kevin

By: Alex Dimitrov

Alex Dimitrov — Tue, 16 Oct 2007 14:23:04 +0000

Hi, Kevin

What CAD system do you use do design and render your constructs?

Thanks
Alex