Re: [Harp-L] Lowering the reed pad and reed aerodynamics




----- Original Message ----- From: "Winslow Yerxa" <winslowyerxa@xxxxxxxxx>
To: "Harp-L" <harp-l@xxxxxxxxxx>; "Robert Coble" <robertpcoble@xxxxxxxxxxx>
Sent: Saturday, January 03, 2009 12:53 PM
Subject: Re: [Harp-L] Lowering the reed pad and reed aerodynamics



Lowering the reedpad itself by lowering the corresponding part of the reedplate surface has been tried by a few people, notably Jerry Murad, who described it to me circa 1996.

The potential benefit is to be able to place the entire length of the reed, especially the root (where the vibrating length of the reed joins the reedpad) as close as possible to the surface of the reedplate (and thereby the slot. Pressing the root of the reed down with a fingernail or a tool still does not eliminate that tiny downward curvature from the root off the reed (which always seems to be significantly higher than the ssurface of the reedplate) to wherever your thumbnaail cam press it.

The only reason that the bottom surface of the reed pad and the top surface of the plate would not lie on the same plane is that one (or both) of them is not flat. A few careful strokes of a file to remove any high places of the mating surfaces should cure the problem without the need for a milling machine.


The most likely problem is a burr from punching the rivet hole in the reed. The first light stroke of the file should reveal any high places.

Vern





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