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Jack Rushing
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Joined: 23 Mar 2007
Posts: 170
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 Posted: Sat Jun 23, 2007 10:44 pm Post subject: Bass Bar Size |
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I have never replaced a bass bar before. Generally speaking, if you
make it a little larger or smaller, What changes does this usually produce
in a violin? |
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MANFIO
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Joined: 11 Apr 2007
Posts: 458
Location: Sao Paulo
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| Posted: Sun Jun 24, 2007 7:48 am Post subject: |
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First, don't try to remove it intact, you can break the top or hurt the wood under the bar. Plane it and then scrap it down.
In general, if the violin was sounding good, the new bar will have the same position, type of wood and shape of the old bar.
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jessupe goldastini
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Joined: 25 Apr 2007
Posts: 169
Location: sana' rafaela'
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| Posted: Wed Jun 27, 2007 2:02 am Post subject: |
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| prior to cutting the f holes in the top plate, we generally will tune the plate....once tuned and then having cut the f holes, we will lose this tune....the bass bar will "replace" or re-enable the plate to be tuned again...so, each plate will be individul...the addition of the bass bar at first is "oversized".....its intended to be shaved down once installed....with the porpose of the shaving to regain the proper plate tune....so each bar will corespond to each plate under any set of given circumstances.....with the end goal to be to get the optimal plate tune....so yes you could in essence shave off too much and have to do it again....or leave too much on, in the wrong spot, and leave the tune not quite there....DAVID LANGSATHER {HE HAS A LINK OFF THIS SITE} is quite a mad genius and has an interesting take on tuning....he describes in quite good detail, the way to approach "sharping or flating" any given area....check it out..... |
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Moodivarius
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Joined: 02 Apr 2007
Posts: 6
Location: Dryden, ON
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Jack H.
Super Member
Joined: 24 Mar 2007
Posts: 346
Location: Israel
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| Posted: Thu Jun 28, 2007 2:02 am Post subject: Re: Bass Bar Size |
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| JacK Rushing wrote: | I have never replaced a bass bar before. Generally speaking, if you
make it a little larger or smaller, What changes does this usually produce
in a violin? |
Hi Jack ( 2 words you do not want to use in an airport...)
Removing a bass bar is fun and easy.
with a gouge or a chisel start to split off most of the mass ( a bass bar SHOULD be in line with the split of the wood, but start at the peak to determine if it is or not). get it down to the last 10th of a mm with finger planes. I ususally use a damp rag and lay it on the bass bar and then with a gouge or a shitsel ( glue chisel) just lift it off from the belly.
A bass bar that has too much mass will not allow the plates to vibrate propperly adn will kill the sound. a bass bar that is too thin will provide a nasally/ hollow sound because it does not provide adequate support.
the bass bar is there to help to resist the downward pressure of the strings on the bridge.
There is a method of determining the propper placement of the bassbar on the instrument.
When you are ready for it let me know.
Have fun and keep the tools waya from the wood on the belly.
Better to cut your own hand. as I was told by my first master, flesh heals, wood doesn't! |
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Jack Rushing
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Joined: 23 Mar 2007
Posts: 170
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| Posted: Thu Jun 28, 2007 7:36 pm Post subject: |
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Scott,
Thanks for site on the bassbar. I wonder what is the purpose for
having the bassbar 3 mms farther from the centerline on the lower
end than the upper end?
Jack |
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Jack Rushing
Member
Joined: 23 Mar 2007
Posts: 170
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| Posted: Thu Jun 28, 2007 7:43 pm Post subject: |
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Hi Jack,
Thank you for the information on the bassbar about the effect on
the sound of the violin. Thats what I wanted to know.
Please check my question in the comment I made to Scott about the
bassbar on the site he named.
Best Regards |
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Jack H.
Super Member
Joined: 24 Mar 2007
Posts: 346
Location: Israel
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| Posted: Mon Jul 02, 2007 1:44 am Post subject: |
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| JacK Rushing wrote: | Scott,
Thanks for site on the bassbar. I wonder what is the purpose for
having the bassbar 3 mms farther from the centerline on the lower
end than the upper end?
Jack |
Does not have to be 3 mm farther, all that is dependent upon a proportion of the upper bout to the lower bout.
Measure from the center line to the widest part of the upper and lower bouts.
Divide these numbers into seven.
Measure ionce again from the center line to the widest part of the upper and lower bouts and then using the 1/7th number mark off the upper and lower bout and mark off. next measure at the mensur, 19.5mm.
The inside of the bass bar will lay on the 1/7 marks and the outside will lay at the 19.5 mm mark made at the mensur.
The reason for the angle can be speculated, but this is what works best, it provides equal support and resistance to all parts of the violin. |
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