Helical Roughing End Mills (HREM) are designed for high performance in long-edge profiling and step milling applications. These end mills are designed to be used with 16mm single-sided Square Shoulder APET/XPET inserts.
Helical ("stacked") cutters create much more tool pressure than standard end mills, due to the increased number of engaged inserts. Dapra recommends not exceeding 10% of the tool diameter in width of cut (WOC) with these HREM tools; irreversible cutter damage may occur.
To reduce tool pressure, it is recommended that the more positive XPET insert geometry be used with Helical Roughing End Mills.