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 Post subject: Fourteenth fret hump?
PostPosted: Fri Sep 14, 2012 8:04 am 
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Cocobolo
Cocobolo

Joined: Wed Dec 22, 2010 12:49 pm
Posts: 273
First name: Victor
Last Name: Seal
City: Osseo
State: MI
Zip/Postal Code: 49266
Country: USA
Focus: Build
Status: Amateur
I am fitting the neck on #3 and I would appreciate it someone would explain what a fret hump is and how to avoid it. I have seen it refered to here on the OLF, but have not seen a detailed explanation. Pals, Vic.


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PostPosted: Fri Sep 14, 2012 8:28 am 
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Cocobolo
Cocobolo
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Joined: Mon Apr 20, 2009 5:15 pm
Posts: 176
First name: Sondre
Country: Norway
Status: Amateur
You will get a "hump" if:

1. you use too much clamping pressure so that the top and the face of the neck are not aligned
2. your fretboard tongue drops towards the soundhole because the neck angle does not match the radius of the top, or the fretboard tongue is not shimmed.

If 1. is the case, you will probably get fret buzz as you approach the 13th fret.

If 2. is the case, you will only get fret buzz if you have too much neck relief. If the relief is correctly set, the "hump" is not really a hump, but rather the point at which the fretboard starts to drop. So, no buzz, but unnecessarily high action beyond the 14th fret.

Sondre


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PostPosted: Fri Sep 14, 2012 8:58 am 
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Brazilian Rosewood
Brazilian Rosewood

Joined: Mon Jan 28, 2008 5:21 am
Posts: 4915
Location: Central PA
First name: john
Last Name: hall
City: Hegins
State: pa
Zip/Postal Code: 17938
Country: usa
Focus: Build
Status: Professional
http://www.youtube.com/results?search_q ... dlF4mT01DI

http://www.youtube.com/results?search_q ... BFryc9s6bY

these 2 links may help shed some light on this subject. The key is in the beginning to have your geometry set so that you have the best shot of getting the fretboard "plane" set up in the sides and top. When setting the neck you need to perfect this relationship. As Todd points out , your fretboard plane is the very important. I would rather see a slight fall off than a rise.
I have also started to plane my fretboard to the guitar before fretting for a better more precise fit.

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John Hall
blues creek guitars
Authorized CF Martin Repair
Co President of ASIA
You Don't know what you don't know until you know it


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