Variable-Pitch End Mills

Helical Solutions (Gorham, ME) new HEVR-5 and HEVR-RN-5 five-flute, variable-pitch end mills are designed for roughing and finishing of steel and exotic materials with increased feed rates and reduced chatter.

Helical Solutions (Gorham, ME) new HEVR-5 and HEVR-RN-5 five-flute, variable-pitch end mills are designed for roughing and finishing of steel and exotic materials with increased feed rates and reduced chatter.

HEVR-5 and the longer-reach, reduced-neck HEVR-RN-5 tools are crafted of certified premium sub-micron grain carbide and feature geometries specifically engineered to cut ferrous material. The tools are available with an AlTiN (titanium aluminum nitride) coating for oxidation resistance and extreme hardness for slotting, peripheral milling, ramping and helical interpolation of stainless and other steels, cast irons, titanium alloys as well as cobalt-, nickel-, and iron-based, high-temperature alloys.

The HEVR-5 tool series features corner radii for added strength and has a variable-pitch design for increased depth of cut, up to one times the diameter of the tool—resulting in an increased metal removal rate along with minimizing any possibility of chatter. Additionally, and due to its unique design features, it is not uncommon for customers to utilize the HEVR-5 for both roughing and finishing, reducing the number of tools and setups.

The HEVR-RN-5 series is designed for applications requiring extended reach into pockets or machining around obstructions. The stub flute length and a reduced neck contribute to excellent tool rigidity even considering the greater tool length.

Speeds and feeds for the tools range from 80 to 250 sfm and 9 to 27 ipm for Stainless, 60 to 125 sfm and 2 to 10 ipm for high-temperature alloys, 500 to 600 sfm and 23 to 76 ipm for steels, 400 to 600 sfm and 24 to 73 ipm for cast irons, and 160 to 190 sfm and 7 to 15 ipm for titanium.

"Although these tools can be used for roughing applications, they are ideal for finishing the hardest and most-difficult-to-machine materials," says Helical Solutions National Sales Manager Scott Tiehen. "And with the higher speeds and feeds, and increased tool life they provide, they offer significant benefits in efficiency and cost."

Helical recommends using high-pressure coolant, flood, mist or dry milling with air blast when machining with these tools, which are available in ¼-inch, 5/16-inch, 3/8-inch, ½-inch, 5/8-inch, ¾-inch, 1-inch and 1 ¼-inch diameters.