Wouldn’t it be more appropriate to use a laser cutter to cut acrylic rather than using a small desktop CNC (Computer Numeric Control) machine to tediously mill it to a desired shape?
Well, the answer is not obvious to sometime who doesn’t care about having unfinished edges.
The difference becomes more obvious when using transparent acrylic. Using a laser cutter, melts the acrylic, leading to the “cut” sides to look more or less like melted plastic, and opaque. Using a CNC machine, on the other hand, gives it a smooth and nearly transparent (usually it’s translucent). Check the image below and you can see the finish.
I decided to make a Jansen linkage model using clear acrylic, a piece of cardboard and some 3D printed parts.
I used Autodesk Fusion 360 to design the shapes and linkages, and also create a gcode file thought is CAM component. Finally, I used an OtherMill to mill them using a 1/16 inch flat end mill. The results were spectacular. The milled surfaces were smoother than any any piece of acrylic cut using a laser cutter.
The brown cardboard was etched and cut using a laser cutter. And the silver pins were 3D printed on an Ultimaker, using an STL file created using SolidWorks. The image of the final prototype is below:
It doesn’t make sense to have a fixed Jansen Linkage model. The whole purpose of having it is to make it look like it is walking. Connecting two or more of these models can make it look like it is walking with more legs.
Here, check it out in the video: