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back hollowing detail question....

 
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jethro
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Joined: 07 Apr 2007
Posts: 178

PostPosted: Sat Apr 14, 2007 2:25 am    Post subject: back hollowing detail question.... Reply with quote

I will be hollowing out the back for violin #2 in a few days. Strobel shows
the hollowing not going past the end block areas, he just leaves a lateral
step- uncut even with the end blocks. On violin # one I hollowed out on either side of the end blocks with a gentle radius up to the block plateau. What is Yall's opinion of which way is better for best sound quality ???? Or is it 50/50 and just a matter of preferance ????????????
Thanks !
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MANFIO
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Joined: 11 Apr 2007
Posts: 458
Location: Sao Paulo

PostPosted: Sat Apr 14, 2007 7:59 pm    Post subject: Reply with quote

The idea of leaving that flat area is from Sacconi, in his book "I Segreti di Stradivari" he mentions that Strad left those areas to give more strength to those places, that are under stress.

I've made some violins with that, but since my instruments are on the thick side and not too scooped on the edges I'm not doing that anymore.

It will depend a bit of your model too, if your model is too scooped near the edge it may be a good idea leaving that flat area on the side of the blocks. As everything in violin making, it will depend on your personal experience...
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jethro
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Joined: 07 Apr 2007
Posts: 178

PostPosted: Wed Apr 18, 2007 2:20 am    Post subject: graduation Reply with quote

Thanks Manfio ! Good to hear it is a practical issue of simple strength
and not a mysterious mode control thing. I am also wondering what
the accepted variation is when you are graduating. The first instrument
I kept it +- about .003-.004 inches. I' wondering if that is to nit-picky-
wasted effort? I don't mind doing it if it even helps acousticly even 1 %
I'm trying to create quality not quantity. I will get faster as I do more.
T.
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