According to Gewefa, by eliminating the previously accepted method of securing boring bars by fitting an adaptor reduction sleeve into a VDI mechanical boring bar holder, the opportunities for inaccuracy and bar deflection during boring operations are now reduced.
With Gewefa's solution, the bar shank is clamped directly into a hydraulic chuck with the ground angle on the back end (of the boring bar) locating against a stop pin at the base of the toolholder. The advantages are a 50% increase in cutter life, due to the more secure grip, guaranteed repeatability when changing like-for-like bars and a simple, foolproof fitting process, says the company. As with all Gewefa toolholders, it is a universal solution.
