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Woodworker Matthias Wandel has determined to search out out which of the varied manufacturers of wooden glue show the strongest, and has turned to a well-known gadget to gather empirical information: a Raspberry Pi single-board laptop.
“I made a number of samples the place I glued considered one of these items onto this piece and these all got here from the identical piece of 2×4 so they need to be constant,” Wandel explains of the samples for testing, put collectively along with his ordinary model of glue and ten others for good measure, “and I will be testing them with the screw jack which is on prime of some load cells to measure the pressure.”
The concept behind the experiment: The picket samples, with each building lumber and maple hardwood used to see if the kind of wooden impacts glue efficiency, are clamped down and the screw jack, pushed by a stepper motor beneath programmatic management, used to use rising stress till the glued joint — or the wooden itself — breaks.
The load cells are related to a Raspberry Pi single-board laptop by means of an acceptable interface, with a intelligent text-based program providing information gathering and visualization: A easy graph reveals the rising pressure, measured in kilograms, then experiences the pressure at which the pattern broke — and captures an image for posterity, utilizing a Raspberry Pi Digital camera Module.
The conclusions drawn from Wandel’s testing could shock, although they arrive with some heavy caveats — together with the notice that some glues that carry out properly are laborious to use, or go off far too rapidly leading to a wasted bottle.
The total video is now obtainable on Wandel’s YouTube channel.
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