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Pronounced Bindings
http://mowrystrings.luthiersforum.com/forum/viewtopic.php?f=10101&t=53684		 Page 1 of 1
Author:  cablepuller1 [ Sat Nov 14, 2020 11:30 am ]
Post subject:  Pronounced Bindings
Hi

I have routed the channels for bindings and noticed on the back at the upper bout the channel goes really shallow(nearly half the depth lost).
I have dry fitted and looks bad, weird as the rest of the back is fine and is a constant radius. I am using a laminate trimmer with adjustable base camber which is adjusted to stay parallel.

2 questions

What caused this and suggested remedy, I will add its Bog Oak and hard as steel so not sure about filing the channel but will if its the best option

TIAImageImageImage

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Author:  Ruby50 [ Sat Nov 14, 2020 11:35 am ]
Post subject:  Re: Pronounced Bindings
Why not run your router over the areas a few times to get them to deepen? Alternatively, a file with a safe edge can deepen the channels without making them wider

Ed M
Author:  TerrenceMitchell [ Sat Nov 14, 2020 11:37 am ]
Post subject:  Re: Pronounced Bindings
I usually get a small amount of this same problem (though not as extreme) on my back upper bought as well. I use a laminate trimmer, but I made a jig that functions similar to the LMI one that "floats" vertically supported by springs. If my sled that holds the body isn't adjusted so that the body sides are all perpendicular with the workbench the problem does get pronounced and I have to adjust and run the cut again.
Author:  Trevor Gore [ Sat Nov 14, 2020 7:54 pm ]
Post subject:  Re: Pronounced Bindings
How flat are your sides?
Author:  James Orr [ Sat Nov 14, 2020 8:31 pm ]
Post subject:  Pronounced Bindings
Trevor Gore wrote:
How flat are your sides?

+1 for Occam’s razor. The sides may not be flat.

If they are, your cutter may not be cutting full depth depending on the angle of attack. Make sure the jig is perpendicular to the side at all times. It’s easy to go askew with it.


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Author:  J De Rocher [ Sat Nov 14, 2020 8:52 pm ]
Post subject:  Re: Pronounced Bindings
Do you have a photo of the laminate trimmer set up you are using? I'm having a hard time picturing how this could happen if your sides are flat. My set up is one of those towers and the depth of cut is set using the cutter and bearings from StewMac. I get almost no variation in the depth of the cut. It's remarkably consistent in fact down to a few thousandths.
Author:  cablepuller1 [ Sun Nov 15, 2020 3:50 am ]
Post subject:  Re: Pronounced Bindings
Trevor Gore wrote:
How flat are your sides?
Seem okay Trevor, I had another go and set the angle sharper and seems to of cured it thanks

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Author:  bluescreek [ Sun Nov 15, 2020 9:31 am ]
Post subject:  Re: Pronounced Bindings
we need to know your process

router cutter you use
the way you set up to cut your channel

we need to see if this is a technique or tooling issue
Author:  Trevor Gore [ Sun Nov 15, 2020 4:01 pm ]
Post subject:  Re: Pronounced Bindings
cablepuller1 wrote:
Trevor Gore wrote:
How flat are your sides?
Seem okay Trevor, I had another go and set the angle sharper and seems to of cured it thanks



That sounds like a win. Well done!
Author:  LaurieW [ Sun Nov 15, 2020 4:51 pm ]
Post subject:  Re: Pronounced Bindings
I don’t even know what “set the angle sharper” even means laughing6-hehe I better look at my set up too, just in case.

Hope you keep us posted with the build progress.
Author:  bluescreek [ Mon Nov 16, 2020 6:42 am ]
Post subject:  Re: Pronounced Bindings
I as suspecting if you used a router without any modification the router learns from the back taper.
if you have a binding jig you didn't set it up properly
be sure to post pics of your technique so we can help
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