Our variable helix, variable pitch, GorillaMill runs 50 to 150 percent faster through all materials, at a greater chip load, than our very good, sub-micrograin—also made in the USA— standard mill.

In fact, we have to present two different speed/feed recommendations because the difference is so great: Finishing; Roughing; StandardMill .

There are many US companies that manufacture end mills that are either variable pitch or variable helix, but only a few that manufacture variable helix AND variable pitch end mills.

That’s because varying both the helix and the pitch is a patent protected design. Hanita, SGS, Dataflute, and our manufacturer, Carbide Grinding Company (aka GorillaMill), are some of the few that do vary both. Except for GorillaMill, the few use a very good design patented by a Japanese company. Gorilla, however, holds its own US patents. We have found that its improved designs usually produce 5 to 10 percent better performance than the other variable helix/pitch endmils, especially in harder materials like Inconel and titanium. We are proud to offer the GorillaMill to our customers and to be associated with them.

1/2" mill; 1018 steel; No coolant.

Slotting: 6/10" depth, 600 SFM, .002 chipload/tooth on 4 flutes.

Profiling: 800 SFM, .003 chipload/tooth on 5 flutes.