====== tri joints ======

^ Techniques infobox ^^
| Image | {{:archive:tri-joint-thumb.png?240}} |
| designers | Popular Mechanics crate advertisement |
| date | 1923 |
| vitamins |  |
| materials |  |
| transformations |  |
| lifecycles |  |
| tools | [[:wrenches|Wrenches]] |
| parts | [[:frames|Frames]], [[:nuts|Nuts]], [[:bolts|Bolts]], [[:end_caps|End caps]] |
| techniques | [[:bolting|Bolting]] |
| git |  |
| files |  |
| suppliers |  |
| reversible | true |

[[:category:techniques|Category:Techniques]]

==== Introduction ====

Three-sided overlapping joints, tri-lapping joints, or tri joints join three [[:frames|frames]] together rigidly in all three [[https://en.wikipedia.org/wiki/Cartesian_coordinate_system|cartesian]] axes by securing each with a bolt.  This unique joint requires only frames, nuts, and bolts, and is the basic technique for building rigid structures from [[:frames|frames]] used throughout Replimat.

==== Challenges ====

==== Approaches ====

All possible tri joint configurations are represented in each tri joint, and accessible via simple rotation or reflection.

==== Rotations ====

==== References ====

  * [[https://books.google.com/books?id=H9D4l0q96vAC&printsec=frontcover&source=gbs_ge_summary_r&cad=0#v=onepage&q&f=false|How to Build With Gridbeam]]

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[[https://github.com/timschmidt/replimat/blob/e0bc0b855bb946bab00c75ca0d8b002ae0dc0172/wiki/tri_joints.html|Original archived page]] — revision 9725, 2023-04-09T04:15:15+00:00, by Tim.