Thomas Coleman

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About Thomas Coleman

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  • Location
    Grayslake, IL
  • Interests
    Guitarmaking, LuteMaking, ViolinMaking,TaiChi, Hiking, Cycling

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  1. cello low angle of fingerboard

    Hopefully someone more knowledgeable than me will chime in, but to get things rolling, I don't think there are any pros to having a cello neck angle be low. The neck angle plays a direct part in the string break angle over the bridge. I believe on cello that this is about 153ยบ. The string break angle is what determines how much of the string force is directed to the top. Too much and it can choke the sound and be too much for the structure, too little and the sound will be weak and wimpy. The average bridge height is around 92mm so if yours is 65mm that seems very low. It is not uncommon for this to happen on cellos (and a lesser extent violins and violas) and luthiers have come up with ways to remedy or prevent the problem, from splines in the heel to carbon fiber rods in the neck. Of course, your best bet would be to take the instrument to a qualified luthier to assess the situation but off the cuff I would venture that the cello may be a candidate for a neck reset.
  2. aniline dye

    Don, have you tried metal complex dyes in oil varnish?
  3. string grooves position at nut

    Especially considering that the original question was in reference to a 3/4 sized violin for the OP's daughter. I would assume that she is a beginner.
  4. string grooves position at nut

    It is a standard practice but I don't believe by everyone. Some do and some don't. I would suggest not doing it at this stage.
  5. violin marquetry

    I just remembered that Michael Gurian will make custom purflings.
  6. Integral bassbars

    David, have you ever tensioned your bassbars? I'm curious to know if you've noticed any difference in instruments of yours that you've seen years down the road. My guess is that over the years you've not noticed any unwanted changes to your older instruments that you can attribute to the tension-less Bbar or you would have rectified the situation.
  7. violin marquetry

    I doubt it but maybe. Try A &M wood specialty products or maybe Luthiers Mercantile. I'm pretty confident you won't find and exact match. Sorry to be a bummer.
  8. How do you "dirty" up a new instrument?

    That's right Don. I posted the original question with the mindset of making something look 50 years old, not 200 years old. I should've been more specific.

    What post?
  10. Digital Amati project

    It may not be a good form! For example, if you wanted to design your own small viola based of some of Helen Michetschlager's ideas you could make a form and instrument around it, but then after playing it in decided that you wanted to experiment with the upper bout being a little wider, you have everything there and saved and it would be a very simple tweak to adjust things. All just speculation but you get the idea.
  11. Integral bassbars

    Koo Young, I am very interested to hear what you have to say about springing/tensioning bbars. I'm still on the fence about the whole thing. Thanks!
  12. Digital Amati project

    I hadn't ever heard of this before. Very interesting! It seemed (seems still) a bit overwhelming but promising. After signing up I did get a manual of sorts in an email.
  13. Pietro Guarneri di Venezia
  14. cello bassbar angle

    I don't think it's usual. In my opinion is is more likely to lead to cracks in the top along the bass bar. On the one cello that i've made the bass bar was angled.
  15. String height (gap under) at the nut - violin

    I use .25 under E, .3 under A, .4mm under D and .5 or .4mm under G.