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How to straighten a bow twist
How to identify and correct a bow that has warped off to the left or right.
Topic Rating: 0 Topic Rating: 0 Topic Rating: 0 Topic Rating: 0 Topic Rating: 0 Topic Rating: 0 (0 votes) 
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Stringwizards
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January 12, 2019 - 11:32 am
Member Since: June 1, 2017
Forum Posts: 1
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Hi,

Please look at http://www.thestringwizards.org   I perform basic repair and maintenance tasks for violins in use at inner city schools in Chicago.  I also teach some high school kids, who also help with cleaning and re-stringing.

After several years of this I have quite a number of spent bows.  I have the equipment to do bow rehairing, but it is very hard to do well, and takes a lot of practice, so more than once I have put this effort aside.  

All bows have a basic camber.  I am not talking about that.  My concern is a number of the bows (with no hair at all) are twisted off to the left or the right when you sight down them the way you might sight down the barrel of a rifle.  I would think a small amount of moisture and a clamp and a 200 degree oven would fix this like you might correct a bridge warp, but I don't have a clamp that would work for a bow.

Does anyone have a suggestion?

Thanks

Terry

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Bob
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January 12, 2019 - 12:35 pm
Member Since: July 13, 2017
Forum Posts: 239
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Terry, 

I can't help with the bow twist (it was indicated to me that the twist might be caused by uneven grain distribution along the bow and that even if "untwisted" in some way, the twist was liable to return eventually), but I hope someone here (hey FiddlerShop!) might know more about it.

I do however applaud the service you're providing to your community and I highly recommend folks to visit your site and view the videos an look at the pictures. 

We need more inspiring stories nowadays 🙂

Thank you

Bob

Bob in Lone Oak, Texas

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Irv
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January 12, 2019 - 1:24 pm
Member Since: December 23, 2017
Forum Posts: 1177
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If you look four pages back under the repair section, you will see a thread regarding a film coating for bow flaming (or similar).  The information you need is likely found there.

An alcohol lamp or electric hot air gun with narrow slot attachment (Harbor Freight) will be required for the bow adjustment.  

Easily done.

Research is what I’m doing when I don’t know what I’m doing.  —Werner von Braun

Without deviation from the norm, progress is not possible.         —Frank Zappa

Experience is a difficult teacher, it gives the test first and the lesson after.

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