APPARATUS FOR MAKING HOLES HAVING BACK-CUT

摘要

2.1 To make drilled holes with an undercut, it is known to use drills with a drilling head widened in a truncated cone shape. An undercut can be reamed at the bottom of a drilled hole by an orbiting movement of the drilling tool. …2.2 In order to permit mechanical production of undercuts in drilled holes, a device is proposed which has a pivotable drilling table. The drilling table is set in an orbiting movement by means of an adjustable pin during the reaming operation. The pin can be pivoted from a concentric zero position into a defined eccentric position. ……