Tool Selection Guide
General principles for choosing a solid carbide end mill's geometry — independent of any specific manufacturer's line.
Flute Count
More flutes increase the number of cutting edges engaged per revolution, allowing higher feed rates for a given surface finish, but reduce the size of each flute's chip gullet — the space available to evacuate chips. High flute counts (5 or more) are generally better suited to finishing passes and harder materials producing small chips; lower flute counts (2–3) generally favor roughing and softer, gummier materials that produce larger chips needing more clearance.
Corner Radius
A radiused corner (as opposed to a sharp square corner) distributes cutting force across a curved edge rather than a single point, reducing chipping risk and typically extending tool life — at the cost of leaving a small radius in internal square corners of the finished part. EUROCUT's confirmed Z5 diameters are available with 0.3mm or 0.5mm corner radius, depending on diameter (see the Z5 series specification table).
Shank Diameter, Length, and Rigidity
Tool deflection under cutting load increases sharply with unsupported length and decreases with shank diameter — as a general rule, deflection scales roughly with the cube of the length-to-diameter ratio. Selecting the shortest overall length that still reaches the required depth reduces chatter risk and improves dimensional accuracy.