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Glossary of laser cutting terms - F
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F-Number
The focal length of lens divided by its usable diameter.
In the case of a laser the usable diameter is the diameter
of the laser beam or a smaller aperture that restricts a laser
beam.
Failsafe Interlock
An interlock where the failure of a single mechanical or
electrical component of the interlock will cause the system
to go into, or remain in, a safe mode.
Feed Rate
The speed at which the cutting head moves.
Focal Point
That distance from the focusing lens where the laser beam
has the smallest diameter. The point at which light rays refracted
by a lens meet. The focal point on a focused laser beam is
the point of highest energy concentration.
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