Patent ID: 6857827

Claim:
A broach for machining precision internal splines, the broach having an overall form of a straight rod of geometric axis made of cutting tool material, the broach comprising: attachment means and, in succession, from front to rear, an inlet guide followed by a cutting section, the inlet guide being cylindrical of diameter D 1 and centered on the geometric axis, the cutting section comprising a predetermined number of cutting teeth centered on the geometric axis and facing forward, the cutting teeth having an outside diameter D at least equal to D 1 and increasing progressively from front to rear, the cutting teeth being laterally separated by slots penetrating into the broach down to a diameter D 3 at most equal to the diameter D 1 of the inlet guide, the cutting section being subdivided from front to rear into a number of cutting portions separated from one another by recentering guides, the cutting portions comprising the cutting teeth, the recentering guides being cylindrical, wherein the recentering guides have a diameter equal to the diameter D 1 of the inlet guide.