Nobody appreciates a good knurl more than the
Traditionally, a knurler was a highly-skilled employee
the aid of his quartz-tipped briding-point, would
carve those strangely attractive yet functional regular
metal surfaces, turning
them into everyday works of art.
Nowadays, of course, knurling is done using machine-
tools such as
the Knurlmaster, usually under computer control.
Howevertheless, contemporary knurlers are missing a
Modern machine tools typically have resolutions down in
micron range, and can be controlled quickly and
This opens up the option of making knurling that is more
decoratively functional. An audio signal, fed to the
machine, can be used to modulate the knurl depth. The
Audio Knurling can be played back simply by tracing a
metal swarf along the helical path of the knurl.
Of course, most knurling consists of multiple parallel
running in two opposite helical directions (known, should
wondering, as Nepalese knurling, after a
where it originated). This provides the opportunity to
independent pieces of music (left and right handed),
multiple tracks, to be played using a suitably fine-
Finally, it is worth pointing out that the threads of
bolts can accommodate simple monophonic recordings,
particularly bass-rich tracks providing extra grip.
Post-finally, I should perhaps mention that we have
prototypified a rifled rifle barrel which, on firing,
0.3msec excerpt from Wagner's Ride of the Valkyries.