Re: [Harp-L] Help with Chromatic repair

[Roscoe Catania <rjcataniajr@xxxxxxxxx>]

...who's going to be the first to make one out of carbonite;)




On Sat, Jan 18, 2014 at 12:18 PM, Joseph Leone <3n037@xxxxxxxxxxx> wrote:

>
> On Jan 17, 2014, at 7:17 PM, Music Cal wrote:
>
> > Is the CX12 comb the only major manufacturer comb made of ABS?
>
> No, most manufacturers are going to abs.
>
> > Are all
> > other plastic combs acrylic?
>
> No, less and less.
>
> > Kind of odd given that acrylic is rather
> > brittle compared to ABS.
>
> Yes, and like plexiglass, it gets more brittle with age.
>
> > Anybody know what drives the decision to use
> > acrylic?
>
> Shrinkage. Acrylic shrinks less and that means that the molds can be made
> closer to final dimensions. Abs shrinks and the mold has to be engineered
> larger in ALL dimensions. This presents a problem with chromatics as the
> combs are way more intricate. AND there are more rejects with abs. Plus
> there is less sprue with acrylic. Sprue is plastic you loose to get the
> mold operating. And then at the end of the run, you loose more sprue as the
> molding process is emptied of material.   But they're getting better and
> better at it.
>
> smokey-joe
> >
> >
> > On Fri, Jan 17, 2014 at 2:28 PM, George Miklas <harmonicat@xxxxxxxxx>
> wrote:
> >
> >> from
> http://plastics.dupont.com/plastics/pdflit/americas/delrin/H76836.pdf
> >>
> >> Delrin Properties and Characteristics
> >>
> >> The chemical composition, regular molecular- structure and high degree
> of
> >> crystallinity result in a unique combination of outstanding
> characteristics
> >> of Delrin® acetal resins not found in metals or most other plastics:
> >>
> >>   -
> >>
> >>   High mechanical strength and rigidity
> >>    -
> >>
> >>   Toughness and high resistance to repeated impacts
> >>    -
> >>
> >>   Long-term fatigue endurance
> >>    -
> >>
> >>   Excellent resistance to moisture, gasoline, solvents, and many other
> >>   neutral chemicals
> >>    -
> >>
> >>   Excellent dimensional stability
> >>    -
> >>
> >>   Good resilience and resistance to creep
> >>    -
> >>
> >>   Natural lubricity
> >>    -
> >>
> >>   Wide end-use temperature range
> >>
> >>
> >> On Friday, January 17, 2014, Music Cal <macaroni9999@xxxxxxxxx> wrote:
> >>
> >>> Hi George
> >>>
> >>> Plastic replacement combs for a 10 holer? Fantastic! Please keep me
> >>> informed.
> >>>
> >>> Hohner combs only?
> >>>
> >>> I don't know anything about delrin. What useful properties does it
> have as
> >>> a comb material?
> >>>
> >>> MusiCal
> >>>
> >>>
> >>> On Thu, Jan 16, 2014 at 1:36 PM, George Miklas <harmonicat@xxxxxxxxx>
> >>> wrote:
> >>>
> >>>> Rivet holes in wind savers: Have you replaced rivets with screws or
> >>>> screws/nuts?  You should not need to punch holes for any other reason.
> >>>>
> >>>> Broken wood combs:  Everybody has a method of repairing wood chromatic
> >>>> combs.  Or you can replace the comb with plastic.  Later this year, I
> >>>> will to begin production of the Miklas Lifetime Comb to replace wood
> and
> >>>> aluminum chromatic combs in 10, 12, 14, and 16 hole models.
> >>> Individually
> >>>> milled from solid ABS, Delrin, or Acrylic, with threaded metal inserts
> >>> so
> >>>> that reed plates and cover plates can be removed individually. More
> >>>> information will be made available as it develops on my website:
> >>>> http://HarmonicaGallery.com/repair
> >>>>
> >>>> George
> >>>>
> >>>> On Thursday, January 16, 2014, harp <harp@xxxxxxxxx> wrote:
> >>>>
> >>>>> Dear Harp-L,
> >>>>>
> >>>>> I have always played the diatonic harp, but have been curious about
> >>> the
> >>>>> chromatic.  I recently purchased a couple of older Hohner Chromonicas
> >>> –
> >>>> one
> >>>>> is a 10-hole, and the other is a “super” 12 hole.  Both have wood
> >>> combs,
> >>>>> and both are in need of maintenance.  I regularly work on my
> >>> diatonics,
> >>>> but
> >>>>> I have never had a chromatic before, so I am jumping right into the
> >>> deep
> >>>>> end of the swimming pool and am going to do some work on these to see
> >>> if
> >>>> I
> >>>>> can make them fully functional.  But I need some help/parts.
> >>>>>
> >>>>> I have already cleaned them up some, and I have opened up the gap on
> >>> some
> >>>>> reeds that were choking and have “ironed out” a reed that had been
> >>> bent.
> >>>>> 100% better already, but I still have a long way to go.  Here are the
> >>>>> issues where I could use some advice:
> >>>>>
> >>>>> -  Both harps have broken combs.  The Super has a vertical crack on
> >>> the
> >>>>> 10-hole that is between 1/16” and 1/8” wide.  This means that both
> the
> >>>>> upper and lower reeds of hole 10 play regardless of where the slide
> is
> >>>>> positioned.  The 10-hole Chromonica also has a vertical crack in the
> >>>> comb,
> >>>>> but it is not at all as bad, and it does not seem to leak enough air
> >>>>> between the upper and lower chambers to affect how it plays.  Does
> >>> anyone
> >>>>> have any recommendations on repairing the comb?  I can think of
> >>> several
> >>>>> ways to go about it, but I thought I would ask the group first.
> >>>>> -  Of course, the windsavers are shot.  Should I just buy the
> >>> windsavers
> >>>>> from Hohner (currently out of stock – anyone have some they would
> >>> like to
> >>>>> sell?)
> >>>>> -  Any suggestions on how to punch rivet holes in the windsavers
> >>> short of
> >>>>> buying the $350 Hohner tool kit?
> >>>>> -  Does anyone have some of the slide buffers (the little pieces of
> >>>>> plastic tubing that cover the mouthpiece screws)?
> >>>>>
> >>>>> Thank you very much,
> >>>>> Brad
> >>>>>
> >>>>
> >>>>
> >>>> --
> >>>>
> >>>>   - *GEORGE MIKLAS,* Harmonica Performing Artist and
> >>>> Entertainer<http://harmonicagallery.com/>
> >>>>
> >>>>   - *THE HARMONICA WIZARD MARCH* by John Philip
> >>>> Sousa<http://harmonicagallery.com/sousa>
> >>>>
> >>>>   - *HARMONICA REPAIR* Done Right by George<
> >>>> http://harmonicagallery.com/repair>
> >>>>   - *HOHNER <http://us.playhohner.com/>*
> >>>> *HARMONICAS*<http://us.playhohner.com/>*...Just
> >>>>   Breathe* <http://us.playhohner.com/>
> >>>>   - *SPAH *- *S*ociety for the *P*reservation and *A*dvancement of the
> >>> *H*
> >>>>   armonica, <http://spah.org/>
> >>>>      - *a non-profit, membership organization dedicated to serving the
> >>>>      harmonica community. <http://spah.org/>*
> >>>>
> >>>
> >>
> >>
> >> --
> >>
> >>   - *GEORGE MIKLAS,* Harmonica Performing Artist and Entertainer<
> http://harmonicagallery.com/>
> >>
> >>   - *THE HARMONICA WIZARD MARCH* by John Philip Sousa<
> http://harmonicagallery.com/sousa>
> >>
> >>   - *HARMONICA REPAIR* Done Right by George<
> http://harmonicagallery.com/repair>
> >>   - *HOHNER <http://us.playhohner.com/>* *HARMONICAS*<
> http://us.playhohner.com/>*...Just
> >>   Breathe* <http://us.playhohner.com/>
> >>   - *SPAH *- *S*ociety for the *P*reservation and *A*dvancement of the
> >>   *H*armonica, <http://spah.org/>
> >>   - *a non-profit, membership organization dedicated to serving the
> >>      harmonica community. <http://spah.org/>*
> >>
> >>
> >>
> >>
>
>
>


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