![]() ![]() The gantry arm is built from steel tubing, a commodity product with plenty of dimensional variability. At least that’s what came up with to help him assess the flatness of the gantry he fabricated for a large CNC machine he’s working on. But what if you want to know how flat something is? Is there something other than a straightedge and an eyeball for assessing the flatness of a surface?Īs it turns out, there is: a $15 webcam and a cheap laser level will do the job, along with some homebrew software and a little bit of patience. You can start with a tape measure, move up to calipers if you need more precision, or maybe even a micrometer if it’s a really critical dimension. When you want to measure the length, breadth, or depth of an object, there are plenty of instruments for the job.
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