The birth of a harp

Posted In: Amateur Harpists

  • Participant
    Audrey Nickel on #160786

    Uh oh.

    Participant
    Liam M on #160787

    Audrey, that should not be a problem, Muis cross grains when he laminates the arch and your zither seats in the center piece of the sandwich. Clarsita has the same hairlines and there has been no impairment.

    Participant
    Liam M on #160788

    Yes that is what I was referring to, I have asked and am awaiting response to find out what I need to do further… I still do not have access to even read the posts…

    Participant
    Karen Johns on #160789

    And I could be the devil’s advocate with my opinions on playing the strings with fingerpads….this could get spicy….LOL

    Participant
    Audrey Nickel on #160790

    Liam, a chara, that’s good to hear!

    Participant
    michael-rockowitz on #160791

    Audrey, Liam,

    Hi. I been following some of your postings here.

    Participant
    Liam M on #160792

    Michael,

    I wonder……. For other reasons, I plugged my zither holes with spruce and then redrilled the spruce dowels to accept the zithers. That could be a positive factor in my case. But I have seen no progression of the hairline cracks and the Trinity that I am restoring has the same cracks and does not slip that I know of.

    This is a picture of Clarsita, the Druid, where you can see the fine cracking. I do not have a picture of the Trinity showing it’s fine cracks, but they are similar. The laminate is biased grained to the face piece we see, so I would expect any further cracking there to be inhibited considerably.

    Audrey, tell Tony plugging would always be an option. I sincerely do not

    Participant
    Audrey Nickel on #160793

    You know, I wonder if the shape of the harmonic curve creates some kind of weakness in this area?

    Participant
    Audrey Nickel on #160794

    Michael…I wonder if the difference in the types of pegs might make a difference.

    Participant
    michael-rockowitz on #160795

    Audrey,

    That’s certainly true about the wedge-shaped friction pegs, which for the violin puts an additional stress on the hole.

    Participant
    Audrey Nickel on #160796

    Actually, on the cherry harps (such as my Bard and Liam’s Druid) the laminate is three-ply.

    Participant
    Audrey Nickel on #160797

    Sorry…I really messed up that embed!

    Participant
    michael-rockowitz on #160798

    Hi Audrey,

    Yes, I see that that’s 3 ply laminate, with each ply being – 1/2″ or so?

    I had this idea – just speculative, based on observation – with a harp with levers, you have the bridge pin bearing some of the stress from the string relative to the neck.

    Participant
    Liam M on #160799

    You are correct Micheal, the laminate is ~1.5cm each. and the stress on the pin is exactly correct as well. My pins are seated quite well as you can see, so the second ply is definitely engaged. The cracks are not deep, <1mm. I have relaxed my strings and run my zithers in further to reengage with a deeper depth.

    Part of the issue is the arch facing piece grain is perpendicular to the axis of the strings, however the sandwich piece is parallel to it. I strongly suspect had the facing piece grain been oriented parallel to the string, this cracking would have never showed. But not sure that asthetically that would suit. it would require quite a wide cherry plank or multiple pieces such as my sandwich piece is.

    Audrey is quite coreect in the mahogany Trinity being multiple laminates.

    Participant
    michael-rockowitz on #160800

    Liam,

    As long as it doesn’t cause you or Audrey structural problems (or progressive structural problems over time), that’s the main thing.

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