The Impossible Dovetail Puzzle
Brian Wetzel, Computer Technology Teacher
Duration: 3 hours plus print time
Level: Intermediate
Resources: CAD program
Introduction
This simple model is based on a common woodworking project that, at first glance, seems impossible to un-assemble. The puzzle begins with the two pieces together, forming a cube. The goal is to separate the pieces. The key is knowing that it is actually a combination between two magnets and a steel ball preventing the two halves from sliding apart, not the impossible dovetail joinery.
Classroom Applications
There are many lessons or uses for the impossible dovetail puzzle in the classroom. I have listed a few of the modeling techniques and/or other ways to use the puzzle in classroom below:
| Modeling Techniques | Post Printing Uses |
|---|---|
| Basic Sketches and Extrusions FIllets Creating Loft Between 2 Sketches Mirroring Tools Offsets | Introduction to Magnetism Units in Science Recess/Freetime Activities Family Game Nights |
Instructional Units
For each of the modeling techniques above, I have estimated times for teacher demonstrations and student modeling.
| Technique | Corresponding Image | Teacher Demo(min) | Student Modeling (min) |
|---|---|---|---|
| Basic Sketches and Extrusions |  | 10 -15 | 15-20 |
| Fillets |  | 5-10 | 10-15 |
| Loft |  | 15-25 | 25-35 |
| Mirroring |  | 10-15 | 15-20 |
| Offsets |  | 5-10 | 10-15 |
