Ball Crater device
The principle of ball cratering to detect coating thicknesses and coating rates uses a wide projection of the coating thickness, which can also be measured using microscopes with less magnification (Mmin=50). A hardened steel ball is turned on the coated substrate surface to grind the coating. As many coatings are harder than the steel ball used, additional diamond suspension is inserted between the coating and the steel ball using a pipette.
Method of operation
An electric motor drives a working spindle, which rotates the steel balls. It is possible to clamp the substrate at any angle to the steel ball by means of a flexibly adjustable tool bracket. The grinding time can be set in different stages. Different ball crater images occur depending on the geometry of the test sample, while concentric circles occur with level test samples, the result on curved objects is accordingly elliptically formed grinding images.