iGull Flow Sensor

thingiverse

The Laser Cutter Coolant Flow Sensor was developed to avoid restricting the flow of coolant if it seizes up and isn't in-line with the coolant line. The design can be scaled for other projects and is easily assembled. It consists of a Hall effect switch secured by tywraps to the outlet end of the coolant pipe and submerged in the coolant reservoir/bucket. The sensor was cut from 6mm acrylic, with a 2mm diameter stainless rod shaft and three 8mm neodymium magnets incorporated into the impeller. A Hall effect detector is used as it switches on each time a magnet passes, indicating proper functioning. Wiring varies depending on the sensor, but plastic spacers or washers help maintain proper placement of the impeller. The assembly is secured to the pipe and submerged in the coolant reservoir for optimal performance. A simple LED attached to a resistor can be used to indicate flow, with additional sensors and modifications possible.