Tangent Ruler – Draw circles passing through two points

Unintentionally I’m going to continue my tradition of making projects involving rulers.

I saw this picture online: https://imgur.com/t/aiko/mu96ohu and I thought it was too cute a technique not to try out for myself. I did a couple of minutes sketching in Inkscape, and then had it lasercut shortly thereafter.

Here’s how to use it. First, simply drive a couple of nails through your favourite table or work surface:

IMG_2031.JPG

Then, using a pen, draw out the circle while keeping the ruler pressed against the two nails:

IMG_2033.JPG

You should end up with a perfect(ish) circle that passes smoothly through both nails.

I’m going to try to remember this trick, I can see it being useful for laying out parts for machining, or to make shapes based off existing features.

Files here for anyone that wants to make their own:

https://www.thingiverse.com/thing:3405583

 

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