harpwrench
916 posts
Sep 22, 2014
8:00 AM
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I guess I didn't get what Michelle was asking, is it how to physically set the profile? If the reed is curled, just hold the reed tip closed with your thumb and poke the backside of the curve to flatten it out. Personally I'm not a "massager." If it's curved the other way I slide a feeler between reed and plate almost in to that point, then apply pressure with my thumbnail where I want to bend the metal.
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www.spiersharmonicas.com
High performance harmonicas.
Last Edited by harpwrench on Sep 22, 2014 8:56 AM
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mlefree
188 posts
Sep 24, 2014
10:31 AM
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STME58, as I am sure you know that Tacoma Narrows Bridge failure is used in physics and engineering classes to demonstrate what happens if a suspension bridge's cables are arranged in such a way as to ~not~ dampen the natural or Eigen frequencies of the vibration of the structure. Had the cables been placed at anti-nodes instead of nodes (points where vibrational amplitude is minimized) of the vibrational wavelengths, the failure would not have occurred.
So, I'm not sure what this has to do with the spring nature of reeds since they are cantilevered and not tethered at any point besides the rivet pad. Maybe you could explain that to me?
And Joe, yes that is precisely the information I am seeking. Thank you very much!
Michelle
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SilverWingLeather.com
email: mlefree@silverwingleather.com
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mlefree
189 posts
Sep 24, 2014
10:34 AM
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I felt it appropriate to say here that a little birdy informed me that Richard Sleigh's "HotRod Your Harmonicas" video download discloses the details of his hard-won secrets and tricks to set up harmonica reeds, including PDF's of his book "Turbocharge Your Harmonicas," and his updated "The Marine Band Field Spotters Guide."
HotRod Your Harmonicas
I just downloaded my copy and highly recommend it. Very detailed and complete. Quite well worth the $49.
Thanks,
Michelle
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SilverWingLeather.com
email: mlefree@silverwingleather.com
Last Edited by mlefree on Sep 24, 2014 10:36 AM
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STME58
1099 posts
Sep 24, 2014
11:00 AM
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mlefree, my point in posting the Tacoma narrows clip was that beams do behave as springs, in response to the comment form mx that a reed is not a beam. Even though it is not a cantilever, and the scale is greatly different, the beams in the bridge are clearly acting as springs. I also wanted to show the power of resonance to those that might not be familiar with it.
Interesting point about the cables being at the nodes. I have seen this video many times but never delved into the analysis.
Last Edited by STME58 on Sep 24, 2014 11:01 AM
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