What are the requirements to the diameter of the hole being counterbored by a counterbore carrying F3B exchangeable three-flute heads?

The diameter of the hole should meet the two following conditions: (a) it should be no less than 70% of the nominal diameter of the applied F3B head, and (b) it should be at least 2 mm smaller than the F3B head diameter.

Assy

An abbreviation for "assembly".

Differential pitch

The unequal angular pitch of a milling cutter (refer also to "asymmetrical index").

ID, I.D.

Inner (inside, internal) diameter.

Inbus

A hex (Allen) key (from Innensechskantschraube Bauer und Schaurte in German).

OD, O.D.

Outer (outside) diameter.

Plunge rate, plungerate

The feed speed (feed rate) in the Z-axis direction.

Static accuracy

The accuracy parameters of a component's geometry, which are measured without load under static or slow-motion conditions.

Step

Often stands for a STEP-file, a data exchange file, used to represent 3D CAD objects in a specific format, as determined by ISO standards. As an abbreviation, "STEP" is derived from "Standard for the Exchange of Product Model Data."

Z-axis milling

Plunge milling.