Variable-Helix End Mill Cuts Chatter
Cobra Carbide’s Viper variable helix end mill is designed to help reduce the chatter caused by variations in chip thickness that limits material removal rates.
Cobra Carbide’s Viper variable helix end mill is designed to reduce the chatter caused by variations in chip thickness. The end mill increases material removal rates and provides high stability for materials commonly used in the aerospace industry, such as nickel, Inconel and its alloys, and stainless steel.
The cutting force and vibration level during chatter are large and can damage the workpiece. Variable helix/variable pitching can interrupt the tool vibrations to increase the stability of the operation, the company says. Cutting forces are increased when the helix angle is smaller and reduced when the angle is larger. Variable pitching decreases resonance at any particular cutting speed.
Cutting holes by interpolating a face milling cutter may be a better process choice for many rough and even finish boring operations. Software improvements and better cutter designs allow expanding use of the versatile face mill for hole making.
Economic efficiency is an important consideration when choosing tools for challenging metals.
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.