Kevin Kelly

  • Content count

  • Joined

  • Last visited

About Kevin Kelly

  • Rank

Profile Information

  • Gender
    Not Telling
  • Location
    Boston, Massachusetts
  1. Digital Amati project

    Hi Torbjörn, I don't know about the first question, but I'm sure it's possible. I don't use the outline function myself. As for the second one, no way. I'm all done with the video demonstrations. I did have Harry nearby to show me how to use it, though, and that really helped. I will admit that at first I was not interested in doing so, but I'm glad I eventually did. I agree. However, in the end the geo engine does the same thing as a divider and straightedge. It just saves a lot of time if you do a lot of drawings.
  2. Digital Amati project

    I should say that the Geo engine is easily one of the most important and useful tools that I have. It may not be for everyone, but if you can manage to figure out how to use it, it's a powerful game changer.
  3. Digital Amati project

    Harry can correct me if I'm wrong here - The program that does the drawings is called the Geometry Engine, which is a program that Harry wrote. It's basically a digital version of a compass and straightedge, but you have to be able to describe the relationships between centers, arcs, and lines in mathematical terms. The idea of a visual ruler and compass already exists in many forms, like SketchUp, for example - I've used that heavily, but you have to know how to dumb it down to use it because the defaults are for doing much more complicated 3D rendering. There are other free programs out there to do similar things, although it's been so many years since i looked I don't know what they are now. The real benefit of using the Geometry Engine to me is that it is programmable, which means you can describe the relationships among the various parts of the drawing and then easily manipulate them. In other words, in the program that I use (I wrote my 'four circle' thing into the geo engine) I can, for example, change the width of the waist, which automatically changes the location of the points of the corners, which in turn changes the arcs of the curves of the corner blocks. To do this by hand takes some work, but on the computer it is just changing one number. Last month I was sans computer for a week, and I had an encounter with an amazing violin, which I decided I had to "copy". This meant deconstructing the design, which I did using pencil and paper, but it took me about 4 hours. If I had my computer it would have taken less than 10 minutes - and I could have just printed out a drawing at the correct size to make a template from. There are some parts of the program specifically for violin makers - for instance Harry has created a function that will add a margin to a finished mold shape, so if you draw the inside of the ribs it will create an outline based on that. You can also instruct it to measure between any parts of the drawings.
  4. Digital Amati project

    The program creates a drawing in pdf form, and the scale is in mm. You can compose a drawing with the program and print it out at the correct size.
  5. Perry Sultana...

    They must be friends by now...

    To connect two previous posts - the oldest orchestra in the US is the Handel and Haydn Society in Boston, which was so named because they performed the old classics and the new stuff (Handel and Haydn) in 1815
  7. Moving across the country for violinmaking school!

    I'm not on the way, but your cat looks an awful lot like mine, except for the eye color, and maybe the attitude... Best of luck to you and your wife, KK
  8. Pechenart, Violon "L'idéal"

    That's pretty awful. I would guess the inspiration may have come from a Stauffer-style guitar head like this one
  9. violas from violins

    I guess that I would want to see the fiddle in person. It is described as a composite - and something was done to the belly to make it fit - but I wonder if the back was cut or not. Not to get too far off the original topic, but my point is that the shape of the Strad CV is one that's part of the Cremonese repertoire. It just doesn't normally show up in violins, and when it does it looks funny, like the upper bouts are too small. Here's the image of the back from the Tarisio website compared to a photo of the front of the Brusilow del Gesù (about 140 years apart). and here it is compared to a Jos. fillius cello (here the corner layout and approach are different, obviously)
  10. violas from violins

    It's interesting that this came up. The formula used for the CV is unusual for violins, but not unheard of. There happens to be a Bros. Amati violin in the Tarisio auction right now that uses the same basic formula. Maybe you can see that it's basically the same, but for the layout of the upper corners. I noticed this violin, because I recently made a violin using the Brucilow del Gesù as a kind of design guide. When I was deconstructing that design, I recognized it as the CV formula and was surprised to find it in a violin (I've seen it in a cello before). I was even more surprised to see it in the fiddle at Tarisio.
  11. Amati Viola

    I agree with everything Conor said above. The only thing I would add is that I would make the notches more Amati-like, by having them curve into the notch, rather than being little triangles. edit: ok, also one other thing - I would take just the smallest amount off the inside ends of the wings so that the curve continues to the end. They look like they start to slightly flatten out at the end (although maybe that's the camera)
  12. Why is a neck block a trapezoid

  13. copying scrolls

    I think that he was plotting the distances from between one arc and the next in 90 deg. increments from an actual scroll, unless I misunderstood - and illustrating a thing about Cremonese volutes that makes them hard to draw - they are not regular spirals. I like this idea, and want to explore it some more. Some first thoughts: Here's a 6:1 triangle. It's cool to use the triangle, but what it's doing is reducing any measurement by 1/6. Any triangle will do this proportionally. For example, a 5:1 triangle will produce 80% (4/5) ratios. You can reduce the width forever and never get to the end, like Zeno's Achilles. Having said that, the 1:6 ratio gives a pretty convincing 360 deg. turn: But doesn't include the eye. Another one can be added and made to fit this Amati scroll pretty well: But I don't see the rationale for connecting them, or the eye. So for me, it means more investigation, someday. In the meantime, the way I do it already gives me a better result - but I'm not convinced that I have it right, and there are times when I'd like to work backwards, from the outside in and my system doesn't let me do that.
  14. copying scrolls

    OK, this looks pretty good. I'd love to see this explained a little better
  15. Grazie Signore - I appreciate your opinion, and don't really disagree with it. (the channel is only partially carved in the photo though - edgework is not finished)