OSB Chair

Concept

A press-fit chair cut out of OSB on the ShopBot.

I started out making the chair in SolidWorks, but I had a terribly time making splines - they were always either under-defined or over-constrained.

As an experiment, I decided to switch to Inkscape for this assignment. It went okay, and I documented tips and tricks in the content archive.

Final part sheet:
T-bone fillets were later added to all of the inner slot/tab corners using PartWorks 2D.

I learned a few valuable lessons about the ShopBot:

If the PC-side software crashes due to communicating errors, static could be the cause. Vacuuming up the dust near the cables seemed to fix this strange issue.
If the ShopBot software crashes mid-cut, make sure to lift the cutting head up before you attempt to move it horizontally. Otherwise, you could break the milling bit.
If you're trying to resume a job after a software crash, it's possible to manually edit the ShopBot cut file, which is simply a series of instructions. When the software crashes, make a note of what line it is on. Then, delete the code between the initialization stuff (line 12 or so) and the line that it failed on.
If you've edited code in this way, make sure that you're at a reasonable x/y position before starting the job. If the head is at [10, 10, 2] and the first point in modified job is [80, 80, -0.5], the cutting head will make a long diagonal traverse, cutting through anything in its way - this is probably not what you want.