Most of the time when you see a Newton’s Cradle, the ball bearings have a small hole drilled in the top with an eye hook attached. That material is really easy to obtain and also to work with using inexpensive tools. The frame appears to be cut from MDF or particle board and then screwed together. decided he wanted to build his own Newton’s Cradle. Named after Sir Isaac Newton, the Newton’s Cradle demonstrates the law of conservation of momentum using swinging ball bearings.
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While it’s a lot of fun writing this code as did, after the break we talk about some off-the-shelf ways of accomplishing the same thing.Ĭontinue reading “Converting Kids’ Hand-Drawings To G-Code” → Posted in cnc hacks Tagged c++, cnc, g-code, laser cutter, laser engraving, meshcam, vcarve DIY Newton’s Cradle Uses Parts Designed On A Smart PhoneĪs far as physics demonstrations go, the Newton’s Cradle is probably one of the most recognizable. Looking at the source code (downloadable from his webpage) it’s clear from commented-out code that he did plenty of experimenting, including varying the laser burn time based on the pixel’s brightness. For each suitable pixel the program then produces G-code that moves the laser to the corresponding coordinate and burns a hole.
program, written in C#, does the work of taking the image from the webcam using OpenGL and scanning it line by line looking for pixels that surpass a contrast threshold. Martin’s scanning and G-code maker program The result was something he took to a recent Maker Faire where many kids drew pictures on paper which his system then scanned and laser etched. Not satisfied with just that, he used his laser printer to make a scanner that consists of a stand for his webcam and a tray below it for positioning the paper just right.
Wrote a program that converts a black-and-white 2D image to G-code so that his laser printer could then etch the image.
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