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Glossary of laser cutting terms - R
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Reflection
The return of light waves from a surface (mirror). See Reflectivity.
Reflectivity
The measure of a materials' reflection of laser light. Highly
reflective materials like copper and aluminum alloys are difficult
to cut requiring reduced work speeds. See Reflection.
Refraction
Deflection from a straight path, undergone by a light ray
or energy wave, in passing obliquely from one medium (like
air) into another (like glass) in which its velocity is different.
Repeatability Tolerance
Measures the ability of a CNC
controlled machine, like a laser cutter, to repeat the
exact part positioning or cutting pattern within the stated
amount of variance for each part placement or cut. The smaller
the repeatability tolerance, the more uniform the cut parts
will be. Often measured in ten-thousandths of an inch or even
in microns — hundred-thousandths of an inch. See Positioning
Tolerance.
Rockwell C
A scale or test used to define hardness in metals, particularly
steel and titanium.
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