![]() ![]() Usually, mechanical calipers reach 0.1mm, which is what we'll reach here. The fact that the Vernier scale makes a fraction of the main scale means that only one of the ticks on the Vernier scale will align with the ticks on the main scale for each distance, allowing you to reach resolutions better than 1mm. ![]() I won't go into detail about how Vernier interpolation works, but the working principal is that we align a 2nd ruler next to the main one, who's scale is a tiny bit different than the original scale (for example, ticks on the Vernier scale could be 0.9mm apart, instead of 1mm). To reach resolution of higher than 1mm (the scale on ordinary rulers), we need to add a way to read in between two ticks. Super cheap print (~30grams of PLA) + super cheap ruler = high accuracy. STL's, Tinkercad & more - all included here. Right-hand / left-handed versions available. Turn a ruler (1mm resolution) into a caliper (with 0.1mm resolution). It's also possible to make a caliper without attaching an actual ruler, but I figure an actual ruler would be more robust & reliable (see the step about attaching a ruler to the caliper for details). Let me just add that making a reliable caliper was my #1 priority, so while making the tool I'll also show you how to overcome the accuracy limitations posed by your 3D & regular printers too, which will allow you to achieve good results. If you're new to 3D printing, this is a great first project for you! The prints are fairly simple and you'll end up having a caliper, which is often used when you want to design your own models. I used my 3D printer to make it, but if people are interested I might make one out of stuff everyone can find. In this instructable I'll show you how to turn a ruler into a caliper. Plus, I figured that if I made a CAD model I could make a left-handed version too! You guys are always forgotten, but not anymore! Also, by using adding a Vernier scale I could reach a resolution of 0.1mm. I figured that if I base my caliper on a ruler, which is super cheap and 100% reliable, I could end up with a very reliable caliper. ![]() For those of you who are unfamiliar with what a caliper is, it's a tool that is most often used to measure out/inner diameters of objects, and there are more than a few instructables on how to use them. After I was done mourning over my 20$, I decided to make my own. Spent 20$ on it, and it's completely worthless - totally unreliable. I recently ordered a digital caliper from China. ![]()
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