The Traditional Process
Historically, cymbals were made from individually cast cymbal blanks which were then hot-forged, often with many annealing processes, to form the rough shape of the cymbal.
The finishing stages consisted of cold-hammering to unevenly harden the metal, then turning on a lathe to reduce the thickness, and then often a final cold hammering.
The hot and cold hammering were all performed entirely by a highly skilled hand and was a labour-intensive process. The only machine to touch the cymbal was a hand-held lathe.
This lathing step could decrease the weight of the cymbal by two-thirds or more, and resulted in further uneven hardening which produces much of the tone of a traditionally made cymbal. This effect was deliberately enhanced by use of a coarse lathe tool, and sometimes by a very limited final polishing, leaving the lathe tool marks as "tone grooves". Traditional cymbals are lathed over the entire surface top and bottom.
Read more about this topic: Cymbal Making
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