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Type: Posts; User: Dave Cohen

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    Re: Recently completed

    John, I took my website down last summer. It was a lousy website, with mediocre photos and some text that just sounded too shamelessly self-promoting for my taste. I am working w/ a photographer...
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    Re: Recently completed

    164971164972

    Looks like I bungled the attachments on the first post, and posted the mandolin in the third post twice. Here are the (correct) photos of the mandolin described in the first post,...
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    Re: Recently completed

    164967164968164969164970

    Here is a mandocello in Engelmann spruce and curly maple. Curly maple and bocote binding, w/ curly maple outermost. Trim is W/African ebony. Finish is NC lacquer, w. a...
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    Re: Recently completed

    164964164965164966

    Here is another one similar to the first one above, except for a standard (i.e., post-through) headstock. This one has an Engelmann spruce top, curly maple back/sides/neck,...
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    Re: Recently completed

    164961164962164963

    This mandolin was built on spec, a by-product of last year's GAL convention. I went to dinner w/ Guitar luthier Steve Kinnaird, his wife, and his shop co-worker. I snatched up...
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    Recently completed

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    Some recently completed instruments. This mandolin has a western red cedar top, claro walnut back/sides/neck, ebony trim. Binding is curly maple and bocote. 13.88" scale...
  7. Re: Learning about acoustics for instrument construction...

    Hay's links to references are not based on my posts. The most pertinent references for your purposes follow:

    (1) N.H. Fletcher & T.D. Rossing, "The Physics of Musical Instruments", 2nd ed.,...
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    Re: Some Questions about F-hole Design

    My degrees are in physical chemistry, and some of the work was theoretical chemistry. As such, much of my course work overlapped w/ that of physicists, including most of the math courses and some of...
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    Re: Dark burst C# mandolin

    Tuners are two sets of Rubners, cannibalized to make five-on-a-side. See photos in post #11, above.
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    Re: Dark burst C# mandolin

    Last instrument in this batch. This is a 10-string/five course liuto, aka five-course mandocello (CGDAE) with a multi-scale fretboard. The E-course length is 23.9", and the C-course scale length is...
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    Re: Dark burst C# mandolin

    Fscotte, that term did not originate w/ me. If my memory serves (no guarantee there) Mike Kemnitzer and Bill Bussman (possibly others?) used that designation long before I did.
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    Re: Dark burst C# mandolin

    And another. This one is a "classical A" with a 13.09" scale length, Engelmann spruce top, and black limba back/sides/neck. Binding is bocote outermost, and trim woods are W. African ebony. The...
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    Re: Dark burst C# mandolin

    Rather than start another thread, I'll just piggyback on the thread I already started. The following photos are of a mandolin I shipped last Monday (2/27/17). In my rush to get it shipped to its'...
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    Re: Dark burst C# mandolin

    "C#" is a musical joke. C# is halfway between A and F on the western musical scale, so a C# mandolin should be halfway between an "A" mandolin and an "F" mandolin, or so it goes. Maybe I should'a...
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    Dark burst C# mandolin

    Attached are some photos of a dark burst C# mandolin, now with its' owner. Photos are of the front, back, a closeup of the scroll side and the body binding, and a closeup of the back plate. Top...
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    Re: F-style Mandolin with Curly Maple Binding

    The binding on the interior of the hoodledink is a straight piece extending to the top point of the headstock with a bend to about 3/32" radius at the hoodledink end. That is the part that I don't...
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    Re: F-style Mandolin with Curly Maple Binding

    I don't know if these are Ducatis. In fact, I don't know what a Ducati is. Some kind of two-wheel vehicle?? If so, maybe these are steps up from a tricycle - maybe a bicycle, or maybe a moped? ...
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    Re: Siminoff's Thoughts On Accoustics

    I think I need to set the record straight here before this thread dies. I have no intention of "roasting" Roger siminoff. I have no quarrel with any of his lutherie innovations and services. To...
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    Re: shopmade binding set-up, what do ya think?

    Here's the problem you are overlooking: When you turn your "sled" on the Shopsmith table top, if you accidentally lift something up even a tiny bit, you have introduced some irregularities in the...
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    Re: shopmade binding set-up, what do ya think?

    If you are relying on setting the ledge height with your body carriage or "sled", you have to do a lot of fiddling with your sled to get the right ledge height. There is a lot less fiddling if you...
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    Re: shopmade binding set-up, what do ya think?

    Your setup will work fine. I built a similar one using ball-bearing drawer slides to give the router facile vertical travel. Also used a counterweight on a pulley so the router will move up and...
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    Re: Neutralising Vinegar?

    Tavy, thanks for that. My earliest encounters w/ organic chemistry convinced me that I wanted to move toward physical chemistry/chemical physics, which is exactly what I did. There was a contingent...
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    Re: Neutralising Vinegar?

    Bernie, now you've got me confused. Esterification would be adding an acetate ( = [CH3COO]- ) group. The acetylation in the article to which Jim Adwell was referring would be adding an acetyl ( =...
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    Re: Neutralising Vinegar?

    Yeah, that's interesting, Although, acetylation uses acetic anhydride, which is way more reactive in general than acetate anion. Acetate anion in solutions of acetic acid does not result in...
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    Re: Neutralising Vinegar?

    Acetic acid, HC2H3O2, is considered a weak acid compared to the handful of strong "mineral acids", such as hydrochloric acid (aka "muriatic acid" = HCl), sulfuric acid (=H2SO4), nitric acid...
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