Automatic detection of washboarding in bandsaws

This paper presents an on-line method for detecting washboarding generated in bandsaws. It uses a parameter based on the shape of sawing force amplitu de distributions. The curve of the probability density function of the para llel sawing force amplitude obeyed a normal distribution for the normal saw n surface, but it changed to an M-shaped distribution when washboarding app eared on the sawn surface of the workpiece. The curve of probability densit y function of the normal sawing force amplitude obeyed the normal distribut ion for any sawn surface investigated. The workpiece including a knot did n ot influence use of the parameter for detecting the appearance of washboard ing.