A hand-held measuring device for identifying the sharpness of knives in agricultural machinery

For detecting the sharpness of knives, which are employed in agricultural cutting and chopping processes, a hand-held measuring device was developed. The measurement method is based on detecting the force which is necessary to cut through a test medium. As test medium a stranded wire is used. The detected values for the required forces are transmitted via Bluetooth to a smartphone. On the smartphone an app is running. It utilizes the embedded calibration model for the individual knife types and calculates the sharpness. Afterwards the results are shown on the display and the user is informed whether the knife has to be sharpened or replaced.

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