On a technical point, I would draw a distinction between vibration and feedback here. Both are forms of impact energy transfer, but only one of them is desirable.
There's no industry standard definition for these terms, but as a bladesmith, I personally classify 'feedback' as:
amounts and frequencies of vibration that actually help the player determine how a blade is performing.
'Vibration' however is the transfer of impact energy down the blade that is:
- Excess to requirements;
- Occurs at the wrong frequency or amplitude, or;
- Which interferes with or 'drowns out' feedback.
In the simplest possible terms, feedback is "good" energy transfer from blade to hand, which actively
improves performance.
Vibration however is "bad" energy transfer from blade to hand, which actively
inhibits performance.
There is no real
universally good or bad vibration in my book*. This is because every player is unique, both in their preferences, and in the performance of their various sensory and motor-control nervous systems.
In all respects, as a bladesmith, vibration and feedback -- regardless of the frequency or amplitude involved -- are ALWAYS features of a blade's performance you want to measure, control and/or influence as much as possible. You want to ensure the player is getting as much (or as little) feedback from the blade as they personally need in order to excel.
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[* NB: The one exception to this rule seems to be very high frequency vibration (aka: 'buzz') - this is the type of vibration that makes your hand tingle the more you experience it. I've yet to find a player who seeks out and enjoys that type of vibration in a blade... But hey -- to each their own 🙂]