[Harp-L] Curvature of the mouthpiece
Mon Jul 4 18:38:41 EDT 2016
Thank you very much for your extremely detailed and helpful explanation! It
has made the process a lot easier.
I'd like to offer to make you a MP to your preferred size/model and
for free in return, please contact me directly with your requirement if you
are interested :)
On Mon, 4 Jul 2016 at 19:30 Vern <jevern at xxxxx> wrote:
> Bend the mp after machining and polishing but before plating.
> Bend the mp by clamping it against a curved form. Mark the form on a
> piece of wood with a compass and cut with a bandsaw.
> Compute the radius of curvature (R) of the old mp as follows:
> L = length of mp measured with a straight ruler on the chord of the curve.
> D = depth of the curve at the midpoint of the mp.
> R = radius of the curve.
> R = L * L / 8 / D + D / 2
> You can ignore the D/2 term for harmonica mouthpieces where the curve is
> Thus R = L * L / 8 / D
> The radius of the form will have to be less than the radius of the
> resulting mp curve to account for spring-back of the metal. Start with 90%
> of the desired curve radius and then cut-&-try smaller radii until you get
> the desired mp curve.
> > On Jul 3, 2016, at 9:15 PM, Li Leon <leon.issac.li at xxxxx> wrote:
> > Hi experts,
> > One of my friend is kindly offered to make me some mouthpieces, to
> > me worn and not so comfortable old ones.
> > Just wondering whether anyone knows by any chance how the curvatures on
> > these mouthpieces are formed and whether it is pre or post
> > Also, what thickness would be the standard/recommended for the coating,
> > getting quote for silver plating but the price seem to vary quick a bit
> > the thickness increase.
> > Any information on the above points is greatly appreciated!
> > Thanks in advance!
> > Cheers,
> > Leon
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