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Weird angle on top at f/b extension
http://www-.luthiersforum.com/forum/viewtopic.php?f=10102&t=4343
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Author:  L. Presnall [ Tue Jan 03, 2006 6:45 am ]
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Ok, so I should've noticed this by now, but I am fitting up my neck to the lefty SJ I'm building...last one with the "old" heel block...all the new have John's neck joint with the "paddle"...anyway, the angle (slope) of the top above the sound hole is too steep...I've sanded as much as I dare (it's starting to show at the top edge of the sound hole)...I still have almost a 1/16" gap at the 14th between the bottom of the f/b and the top of the body...and the angle is 1/8"-3/16" too high for the bridge...my thoughts are:

1. Add an ebony "patch" to the f/b bottom from the 14th fret down and taper it from the 14th to "nothing" at the end of the f/b extension.

2. Add a 1/16" or so ebony "bottom" to the bridge.

After that, I'm out of ideas...any wisdom/ideas/"I've been there" advice? TIA.

Larry

Author:  Dave-SKG [ Tue Jan 03, 2006 6:50 am ]
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pics would help. how about making a canterlevered fretboard like Mcphereson is doing? You would have to put a different bridge on tho...Dave-SKG38720.6192361111

Author:  Daniel M [ Tue Jan 03, 2006 8:45 am ]
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I have used the Ebony wedge before & it worked great. My issue was the opposite of yours, (I oversanded the top under the fingerboard) but same principle.
I stuck my wedge on a ramped board & passed it through the thickness sander 'till it was the right size.
Good luck with the fix.

Author:  L. Presnall [ Tue Jan 03, 2006 10:42 am ]
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I don't think humidity did it...I think somehow I sanded the upper bout area too much with the bowl on the neck joint area...the top takes a dip toward the cutaway area...I'll post a photo in a bit...

Author:  L. Presnall [ Tue Jan 03, 2006 12:42 pm ]
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Okay, here are a few pix...don't know if they captured the issue...





The angle is just bizarre...I think something at the top of the heel block must've ended up low, and I glued the top on without catching it...must've been high on LMI white!

Author:  L. Presnall [ Tue Jan 03, 2006 1:31 pm ]
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Bump

Author:  Dave White [ Tue Jan 03, 2006 9:04 pm ]
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Larry,

This is what I did with one of mine. The fingerboard extension is floating and not glued down:


Author:  John Kinnaird [ Tue Jan 03, 2006 11:26 pm ]
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That is clever Dave. Anything that looks intentional works.

John

Author:  Dave-SKG [ Wed Jan 04, 2006 2:41 am ]
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HERES SOME PICS OF A MCPHERSON USING THE CANTILEVERED NECK/FRETBOARD:





Author:  L. Presnall [ Wed Jan 04, 2006 7:41 am ]
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Thanks for the quick response and all the info guys...(I love this forum! )...looks like the ebony tapered wedge is gonna work out...I used an Ebonoid head plate that I had left over from Allied and it looks good...(HARD to sand tho! )...that stuff is WAY harder than sanding regular ebony! I'll post pix when it's all done.

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