Like many of us, Robert grew up with Spirograph. He’s is also involved in woodworking and wood turning. He has been putting together a pin router system that will cut spirograph designs into many kinds of wood projects.

(If the only kind of router you know is the box that delivers your internet, then you need to understand that there is also a woodworking power tool called a router.)

Carpenters use routers to shape the edges of boards. Routers can be hand held or mounted in a table, allowing you to move the wood rather than the machine.

A pin router adds a simple guiding system to the router table. The pin, aligned with the router bit, enables you to quickly and accurately copy complex patterns and shapes from a template into a piece of wood. Guitar makers and small shop furniture makers use pin routers for accurate, repeated cuts. (Learn more about them here if you’re interested.)

Enter Spirograph, and Robert Roehrig’s pin router.

He found that the die-cast metal Spirograph (which I reviewed here) is able to do things that plastic pieces are too flimsy for. (Plus, it looks cool.)

You can see that he has screwed the ring to a “sled” which he can move freely with his hands. A piece of wood is attached to the underside of the sled with double-sided tape. As he moves the sled, the wood is engraved by the router bit. The pin, visible on the top, is aligned with the router bit. Because he can’t see what’s happening, he has to trust that every movement of the sled is transferred to the wood.

When he inserts the pin in a pen hole in the Spirograph wheel, and he slowly moves the sled around while keeping the gears engaged, the router bit carves out a spirograph pattern in the wood below.

“It’s like doing Spirograph in reverse,” he says.

This next photo shows the router bit beneath the table. You can see how it lines up with the pin on top.

Here (above) it looks like he has put another piece of plastic on top of the ring that keeps the inside wheel from jumping out – a hazard familiar to anyone who has used a Spirograph.

Finally, here are some little Square Bottles he turned, sporting medallions made with the spirograph unit.

I hope to hear more from Robert about his explorations. I’ll continue to share them here.

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