The potential application of indirect tool wear monitoring methods in circuit board drilling is discussed. Monitoring methods are discussed and the state of tool wear monitoring research is presented. The nature of cutting forces developed in drilling FR-4 is examined using a simple numerical model of drilling which explains the structure of drill vibration spectra. The spec ta of predicted forces are shown to have nonzero amplitudes only at multiples of the fundamental frequency of the drill. Experimental spectra are presented which agree with these predictions.

This content is only available via PDF.
You do not currently have access to this content.