Kennametal’s Mill 4-12KT Features a Triangular Margin Design
Kennametal’s Mill 4-12KT tangential shoulder mills apply lower cutting forces and feature a triangular margin design enabling faster feeds without putting additional stress on the spindle, the company says. The product has tangentially mounted inserts with four cutting edges per insert. Seven-corner radii from 0.016" to 0.122" (0.4 to 3.1 mm) are available along with coolant-through, medium and coarse-pitch cutter bodies ranging from 2" to 8" (50 to 200 mm) in diameter. The axial depth of cut ranges from 0.019" to 0.472" (0.5 to 12 mm).
The milling tools provide lower cutting forces which, according to Tim Marshall, senior global product manager, enable users of lighter-duty, 40-taper machine tools “to feed faster without putting additional stress on the spindle.” He adds, “In long-overhang situations, or where part fixturing is less than optimal, lower forces equate to less chatter, reduced edge chipping and smoother surface finishes.”
The company says that the tangential insert design takes greater advantage of the strength of the carbide thickness than radially mounted inserts on traditional milling cutters.
Creating threaded holes in titanium alloys calls for proper techniques based on an understanding of both the properties of these materials and the peculiarities of the tapping process.
Consider these alternatives when conventional drilling can't do the job.
One of the most common methods of tapping in use today on CNC machines is 'rigid tapping' or 'synchronous feed tapping.' A rigid tapping cycle synchronizes the machine spindle rotation and feed to match a specific thread pitch. Since the feed into the hole is synchronized, in theory a solid holder without any tension-compression can be used.