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Making a New 'back up' bridge pdf
Topic Rating: 5 Topic Rating: 5 Topic Rating: 5 Topic Rating: 5 Topic Rating: 5 Topic Rating: 5 (2 votes) 
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cdennyb
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May 25, 2012 - 8:25 pm
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OK, I read Daniels post about making a new bridge for his electric violin and I got to thinking that there's already been a few things written and posted about bridge construction but I figured what the hey... I'll post the one I made for a friend of mine.

I sent it off to him via e-mail and he followed it and made a perfect second bridge. So... here it is for all to read and comment on if necessary. Although it probably applies to all instruments, E and A type, I figured and wrote it up only for the acoustic version.

Cutting a new back up bridge

enjoy.

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"If you practice with your hands you must practice all day. Practice with your mind and you can accomplish the same amount in minutes." Nathan Milstein

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NoirVelours
Quebec
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May 25, 2012 - 8:35 pm
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Very nice Dennis, this should prove useful to those of us who wants to try their hand at bridge making/fitting.cheers

"It can sing like a bird, it can cry like a human being, it can be very angry, it can be all that humans are" Maxim Vengerov

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DanielB
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May 26, 2012 - 3:34 am
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Great article, cdennyb!

When I had to cut my blank to be able to play my e-violin, I ended up doing close to the steps you list here.  42mm radius and all.  Having no real idea what the string spacing should be, I just looked at some close-ups of violin bridges and cut the string dips by eyeball.  It came out close enough though.

But considering how many violins (both E and A) in the inexpensive price range come with no instructions and just a bridge blank, this sort of article is great.

thumbs-up

"This young wine may have a lot of tannins now, but in 5 or 10 years it is going to be spectacular, despite the fact that right now it tastes like crude oil. You know this is how it is supposed to taste at this stage of development." ~ Itzhak Perlman

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Fiddlerman
Fort Lauderdale
May 26, 2012 - 10:07 am
Member Since: September 26, 2010
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Great guide Dennis. Thanksthumbs-up

"The richest person is not the one who has the most,
but the one who needs the least."

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Mad_Wed
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May 27, 2012 - 4:09 pm
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Thank You! coffee

/bookmarked the page/

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springer
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May 27, 2012 - 4:53 pm
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Dennis have you played around with the width of the top of the bridge to see how that changes the trace?drooling

 Also have you changed the post position to see how it changes the traces?serenade

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cdennyb
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June 12, 2012 - 9:03 am
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Playing around with the width after it's been thinned to a min of 2mm has little effect on the trace. The biggest effect comes from the stock 3-4mm width being reduced to 1.5 - 2mm.

I've noticed a dramatic change in the upper frequencies when the E and A strings are allowed to embed themselves beyond that magic 1/2 diameter of the string into the maple. It almost dampens the higher freqs beyond 12K to 20K.

The bridges with a piece of bone or ebony embedded in the top surface for the E string to ride on are worth every penny of their additional cost.

The Soundpost position is a whole 'nother ballgame. It's position is so varied from instrument to instrument that there's really no set spot that works. It's a real 'trial & error' practice session. I have found that majority of the bridge to post relationships are placing the bridge at or next to the post on the tangent side closest to the treble or E string side and no more than 2-3mm forward of the post (toward the fingerboard) My 90 yr old German violin likes it about 4.5mm forward of the post. Maybe that tells me the post is in the wrong spot, I don't know yet. That's where I get the best trace.

"If you practice with your hands you must practice all day. Practice with your mind and you can accomplish the same amount in minutes." Nathan Milstein

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Oliver
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June 12, 2012 - 12:03 pm
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What are you using for readout ?  Audacity ?

Have you established any effects for the little tubes usually on the "E" and sometimes on the "A" for different manufacturers ?

When you come to a fork in the road, take it.

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ftufc
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June 12, 2012 - 12:36 pm
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Denny, you always crack me up and amaze me all at the same time, lmao!

This is such a terrific instruction that you've put together; I just wish I felt more comfortable tinkering with one of my "children".

From the analysis you did on my most recent violin, I'm sure the sound post needs adjusting (I had asked this question of the forum several months ago, "should a sound post be positioned at a slight angle?").

Anyway, great piece, thanks for sharing it.

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springer
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June 13, 2012 - 8:51 pm
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Thanks Dennis!!!!

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RosinedUp
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October 2, 2012 - 6:55 pm
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Thanks for the good instructions, Dennis.

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