Patent ID: 9079280
Filing Date: 2015-07-14
Classification: B23Q,G01N,G01R,G05B

Abstract:
1. An apparatus for monitoring the operation of an electrically conductive tool of a machine tool, comprising: a. at least one electrically conductive spindle for holding the tool; b. a detector which is configured to determine an electrical resistance between the spindle and an electrically conductive work piece to be processed; c. wherein the spindle is electrically isolated from the machine tool or the apparatus is adapted to electrically isolate the work piece to be processed from the machine tool; and d. a voltage divider, wherein the voltage divider comprises at least two resistances, wherein a center tap of the voltage divider is conductively connected with the spindle and the detector, and wherein one end of the voltage divider is conductively connected with the work piece.