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Stradivari arching

 
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JWH
Member


Joined: 26 Mar 2007
Posts: 72

PostPosted: Thu Jan 31, 2008 4:03 pm    Post subject: Stradivari arching Reply with quote

Presently, I've been using the Milanollo pattern. In fact, it's the only pattern of Stradivari I have used (with some modification). Not having seen other patterns, how well does the Milanollo design fit Strad's overall arching system through the years even though this model came late in his career? Wherein, other models having varying heights of top plate and back, as well as overall size, does Strad hold to the same arches by drawing them in on longer dimensions and spreading them out over shorter dimensions? Put another way, does Strad keep to a consistent arch, but where body length, width, and height vary, perhaps, he adds more scoop before he starts the arch in longer and wider models and vise versa?
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Michael Darnton
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Joined: 23 Mar 2007
Posts: 1281
Location: Chicago

PostPosted: Thu Jan 31, 2008 9:23 pm    Post subject: Reply with quote

I haven't looked at the poster for a while, but what I remember is that the Milanollo is relatively flat--low. Stradivari violins have a lot of different arches--remember that he worked for about 70 years, so you'd expect a certain amount of variability. Mostly his archings can be divided into periods, with strange interludes. One gets the idea that he would maybe work for a while--like 10-15 years--one way, and then get an urge to try something different, and vibrate around a bit before settling on something new again.

Most Cremonese crossarchings seem to fit curtate cycloid curves quite closely, but there are a lot of different ways to integrate those curves into a violin, and make them look different.

Here's some computer software to set you out on this path:
http://www.cgl.uwaterloo.ca/~smann/ccycloid/

Also, check some of the stuff on my webpage, here:
http://darntonviolins.com/violinmaking.php
in the laser scanning section.
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Andres Sender
Super Member


Joined: 23 Mar 2007
Posts: 275
Location: N. CA

PostPosted: Thu Jan 31, 2008 10:24 pm    Post subject: Reply with quote

[re-re edit]

I found I could get pretty good matches for the top arching using cycloids, except that I had to fudge things a bit for the c-bout.

At that point it becomes an exercise in deciding how to back out any distortion, and ultimately what aspects of the cycloid are most important to preserve vs. non-cycloid elements which might have been original.

The arching is actually fairly high on the Milanollo.
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JWH
Member


Joined: 26 Mar 2007
Posts: 72

PostPosted: Fri Feb 01, 2008 2:27 pm    Post subject: Reply with quote

Thanks Michael, great resources.

We had a discussion before about how the arches may affect bass quality, and I described how my arches approach the edge by having little scoop and more abruptness when they meet the edge. Thought I'd post some pictures and have you confirm or not confirm based on what you see.

Violin 1
http://img145.imageshack.us/my.php?image=084sd3.jpg
http://img223.imageshack.us/my.php?image=082mg2.jpg
http://img223.imageshack.us/my.php?image=085ws4.jpg
http://img120.imageshack.us/my.php?image=091so4.jpg

violin 2
http://img227.imageshack.us/my.php?image=086li6.jpg
http://img259.imageshack.us/my.php?image=092yw6.jpg
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Andres Sender
Super Member


Joined: 23 Mar 2007
Posts: 275
Location: N. CA

PostPosted: Fri Feb 01, 2008 4:37 pm    Post subject: Reply with quote

FWIW JWH, you have transformed the character of the top arch into something non-Milanollo by (among other things) adding a lot of fullness and eliminating recurve areas in the outer bouts.

Milanollo lower bout archings:

http://img31.exs.cx/img31/5352/straddgstainlbweb6xl.jpg
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JWH
Member


Joined: 26 Mar 2007
Posts: 72

PostPosted: Sat Feb 02, 2008 5:58 am    Post subject: Reply with quote

"WIW JWH, you have transformed the character of the top arch into something non-Milanollo by (among other things) adding a lot of fullness and eliminating recurve areas in the outer bouts."

I know and I shouldn't be doing every thing by eye. Maybe, I'll make some templates the next time. I am getting great sound in the high registers, but no doubt the bass quality is suffering from this configuration. Thanks
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