There are many parameters to consider when choosing carbide insert. Carefully select insert geometry, insert grade, insert shape (nose angle), insert size, nose radius and entering (lead) angle, to achieve good chip control and machining performance.
Select insert geometry based on selected operation, for example finishing,semi-finishing and Roughing.
Select the largest possible nose angle on the insert for strength and economy.
Select the insert size depending on the depth of cut .
Select the largest possible nose radius for insert strength.
Select a smaller nose radius if there is a tendency for vibration.