What is a circuit board drill?

A circuit board drill is a high-precision micro drill that is intended for drilling composite laminates – the main material for producing printed circuit boards, referred to as printed wiring boards (designated as PCB and PWB).

What is 'thrust force' in drilling?

In drilling, the thrust force is an axial force that acts in the feed direction. This force compresses the drill along its axis. The thrust force is the resulting force of axial loads on the chisel edge, the major cutting edges (lips), and the minor cutting edges of a drill, while approximately 50% of the thrust force falls on the chisel edge.

What hole accuracy do ISCAR SUMOCHAM assembled drills with exchangeable carbide heads provide?

ISCAR's SUMOCHAM assembled drills with exchangeable carbide heads provide hole accuracy in the IT10-IT9 ISO tolerance grades under normal cutting conditions.

What do letters "BN" and the number after them in designations of BAYO-T-REAM reaming heads mean?

The letters "BN" in the designations of BAYO-T-REAM reaming heads refer to "bayonet number". The number after "BN" indicates the specific size of the bayonet connection to mount a solid carbide reaming head in a holder, such as BN5, BN6 and so forth.