soft-spoken adjective. âº usually âspeaking in a âquiet âvoice: a soft-spoken, âunderstated âstyle. (Definition of soft-spoken from the Cambridge Academic Content Dictionary Â© Cambridge University Press).
The laser drilling process involves the use of an infrared laser (of surgical grade at a wavelength about 1064 nm) to bore very fine holes (less than 0.2 millimeters or 0.005 inches in diameter) into a diamond to create a route of access to a black carbon crystal inclusion.
1 A diamond pilot bit adds significant cost to the already expensive diamond core drill bits. 2  The diamond pilot bit often wears out before the main core bit. 3  Drilling times can be considerable when drilling in very hard materials and a pilot bit increases the drilling time even more.