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![](https://pinterest.com/pin/create/button/?url=https%3A%2F%2Fwww.homemadetools.net%2Fforum%2Fshowthread.php%3Fp%3D44899%23post44899&media=https%3A%2F%2Fs3-us-west-1.amazonaws.com%2Fforumcache%2F44899-1.jpg&description=Ellectro - Mechanical Tachometer by mklotz - Back in the days before cheaply available electronic tachometers I built this device to measure the speed of some of my model steam engines. Outdated now, it serves as a nice demonstration piece for teaching young people how rotary speed can be measured.
The turned disk has sixty 1/16" holes drilled in the rim so when the electronics are hooked up, one Hertz on the counter corresponds to one RPM on the tach. The holes interrupt an infrared= "Pin It")
Back in the days before cheaply available electronic tachometers I built this device to measure the speed of some of my model steam engines. Outdated now, it serves as a nice demonstration piece for teaching young people how rotary speed can be measured.
The turned disk has sixty 1/16" holes drilled in the rim so when the electronics are hooked up, one Hertz on the counter corresponds to one RPM on the tach. The holes interrupt an infrared beam impinging on a photo transistor to generate the pulses that are counted by an external counter.
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