Patent ID: 8137037

Claim:
A burr-removing tool for inserting a spindle into a bottomed hole made on a workpiece, whereby a burr remaining in the hole is removed and abnormality of a depth of the hole is detected, the tool comprising: a tool case capable of advancing toward and retracting from the workpiece; tool case position detecting means for detecting that the tool case has reached a forward limit position; a piston movably accommodated in the tool case; pushing means for urging the piston towards the workpiece; the spindle provided at a leading end of the piston; a piston position detecting mechanism for detecting a position of the piston according to whether or not the piston has retracted a certain distance from a forward position to which the piston has been pushed, and communication has been established between an air hole formed in the tool case and an air channel formed in the piston; and a judging section for judging whether or not the depth of the hole is normal according to whether or not the tool case has been detected by the tool case position detecting means and whether or not the position of the piston has been detected by the piston position detecting mechanism.