Friday, December 4, 2009

Classical Bridge-glue

On Monday of this week, we sprayed our final two build coats of lacquer and gave them a full two days to cure before wet sanding. This means that the finish will shrink back less after you do wet sand, but meant that I didn't have much to do for the first three days of the week.
Thursday, I finally got to wet sand and do an initial buff. The next step after that is to check the neck set and correct any shifts that may have occurred in the finishing and wet sanding stages. It doesn't take much material added, or removed from either side of the heel to misalign the neck, so you have to take the time to check again. In theory it also doesn't take much to correct the problems, though it's always more work to shift it in a favorable direction. With every neck set, there are three things to look for: The neck pitch, which is the angle at which the plane of the fingerboard meets the plane of the guitar top; Then the center lines of the neck and the body must align; And finally, the fit. Ideally the fit of the neck to the body if flawless, with no gaps or rolled edges. This can be achieved with the use of chisels and sanding sticks if needed, and then finished by pulling sandpaper between the joint until the fit is achieved. I'll let you all decide how I did when I go back home.


Here's another shot of the bridge being glued in place. This is a bit of a different clamp arrangement from what was used on the baritone, but it uses the same basic idea. There is a large clamping caul inside the guitar that fits into the bracing pattern to disperse the clamping pressure evenly. These clamps have a leveling foot that keeps the long body of the clamp from sagging. The leveling feet are placed on another small caul to keep it from marring the face of the guitar.
Here's a picture of one side on my guitar heel and how it fits. However the lighting and reflections are a bit deceiving so refrain from judging until you see it in person. After the initial buffing and during the final neck set, a bunch of grit from the 180 grit paper used for the fitting process fell all over my bench and put some more scratches in my guitar in various spots. They are no big deal and they will be taken out in the final sand and buff, but you can see them in some of the pictures here. So remember, it's still a work in progress.

When this guitar is done, I'm sure that I'll be fairly happy with how it looks, but right now so many things need to be polished and cleaned that I'm not that impressed with it yet. Hopefully you all don't see the things that bug me so much. The headstock turned out looking pretty sharp, though I'll have to do some creative polishing inside the tuning machine slots.




Here's a picture of... Something. I'm not quite sure what I was aiming for, but you can see some good detail in the rosette when you enlarge the image by clicking on it.











And one last picture showing an accurate depiction of the rosewood color minus the reflections present in the other picture. I got lucky on my wood selection, which hopefully doesn't mean less luck on my next set. Monday I will string up and do the initial setup, and then unstring, re-sand, buff, polish, and then do a final setup. Almost done, so hopefully just one more day. I imagine we'll start our arch top guitars immediately once these are done.





2 comments:

  1. Monday has come and gone. How does the guitar sound?

    Mom

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  2. It sounds good. I haven’t heard it yet away from the noisy shop, but it has good sustain and is very comfortable to play. The rosewood looks awesome too. I put some different strings on it today and they seem to drive the top a little better.

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