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2009-08-19

Fingerboard and Bridge

Fingerboard
Finally I had figured out how to paste the finger board.
I had several issues with the fingerboard

1) The wedge shape wasn't symmetrical so I had to make sure the alignment is correct. I.e. the fret lines are perpendicular to the center line.

2) The neck angle is correct.
After adding in the bridge and measure the space at 12 fret, it's about 3mm.
Plus the 1mm at nut and bridge, it should be about 4mm at 12 fret.

3) How to glue the fingerboard without it moving around while clamping.
The solution: registration holes.

After figuring out the details, I proceed to clamping the fingerboard.
Clamping part was easy since all the minute details is ironed out.


Drilling the registration hole with 1mm drill bit.


Fingerboard ready for gluing


Applying the glue.
I use PVA white glue for the fingerboard for easy removal next time.
The glue didn't spread too well with that hardened brush...


Gluing it and putting the steel wires to align the fingerboard.
I didn't use paper clips 'cos I can't find one in my house.
Thanks to my late father's steel wire which he often use to fasten things with.


Another view.


Clamping the finger board.
I use my useful little wooden blocks, which I got at Daiso, to spread the pressure.


Another view


From the top


At the upper bout area. The blocks are useful for ensuring even pressure.


Close up at the upper bout region


At the nut area


Another view

Making the bridge
Then after clamping the fingerboard, I process to make the bridge.
I had a pre-made bridge actually, but that time when I buy the material, I choose one with a slanted saddle slot.
The slanted slot was common in steel string guitars for intonation compensation purpose, but for classical the compensation did not have to be so extreme.
A straight slot with variation in the saddle slot would suffice.
Now I just want a normal perpendicular saddle slot so I make my own bridge instead.
But the pre-made bridge was a good model for me to copy, so I didn't have to take much measurement; just copy everything based on it.

I wanted to make the bridge all by just using hand tools.
First I saw the bridge blank to size.
For the sawing part, a bench hook will be using.
I didn't had time to make one and so I just make a temporary one by clamping 2 woods together.
After which, I use the tenon saw to saw the bridge blank to size.
Then i proceed to saw the wings and chisel away the excess.
Suddenly due to the knot in the blank, I accidentally chip a corner....
I am left with big decision to discard and use the pre-made bridge or just stick with it.
I chose to stick with this blank and so I decided to round the corner's instead of the conventional classical bridge look, which had squared edges.
But to prevent further accident's I decide to route the excess away instead of chiseling...

For routing, always go for a few passes instead of 1 deep pass.
I nearly caused a 2nd accident with my deep pass routing...
Luckily the mistake wasn't too great to fix.
After removing the excess, I proceed to file the wings to shape.

Then I shaped the saddle slot region
I use the backed saw with a wooden block guide to saw the slot.
Chiseling the slot wasn't too easy but luckily I have the 2mm chisel.
Then I remove the waste using the chisel.
Now I use the bone saddle and found that it didn't seat well.
It was rocking so I spend some time flattening the bed of the slot using files.

Then I drill the holes for tying the string.
I wanted a 18-hole design, so I manage to drill 3 holes.
I did it free hand without any support.
But unfortunately, I didn't manage to see how deep I drilled and I drilled to the other side of the bridge, the back part of the saddle slot.
After which I put a tape on the level which I should stop drilling.
No choice, then I mixed some PVA white glue with some rosewood dust and fill the holes.
Well the patching looked pretty good actually.

Then I began to fit the bridge to the top.
My top was pretty domed so the sanding process took quite sometime.
The sanded dust was used to patch the drilling hole mistake.
After some time the wings still have some gaps but the central region was matched.
Well once I get my hide glue prepared, I should be about to glue the bridge.


Saw the bridge blank end.
I had to make a temporary bench hook for the sawing.


Close up view


Rip sawing the bridge blank.
To ensure straight saw line, I use a backed saw.


Sawing the wing section


Oops! A corner chipped off while I was chiseling the excess.


No choice I process to route the excess instead of chiseling
Wooden blocks are guides.


However, don't do 1 deep pass. Divide it into multiple smaller passes.


This I did with 1 pass, it is crooked.
Luckily for me not a 2nd big mistake..
Subsequent routing I did with 2 passes at 1/2 the depth each.


My bridge and the pre-made one.
Looks good? Well, except for the chip off.


Another view


Close up of the chip off.
It's not too bad actually.


Sawing the saddle slot. The wooden block is for guide.


Another view.


Chiseling the saddle block excess.


Drilling the string holes.
I use 2 block to clamp the bridge.
The pre-made bridge is use as a visual guide for the holes, though I have already marked the holes with pencil.


The end result - 18 hole bridge


Sanding the bridge to fit the top.


Pore filling? More of patching the drilling mistake.


Some dirty marks on the top. So how to remove it?


The answer, erase :)
(The eraser which I used is at the top left hand corner.)



The guitar (near finished)


The top with fingerboard glued


With the sound port view.


Lower bout area


Leveling the fretboard
I spend some time to level the fret board by sanding with a sanding block (my wooden plane)
After that I plane some relief into the fretboard.
The relief will start at the 5th fret.


Planing the reflief into the neck


Another view


Sanding flat the fingerboard


The ebony dust produced is sucked up by vacuum later on.


Close up view


Checking the neck relief using the backlight.


Another view


Another view


The weight of the bridge is about 21 g.
I bought the digital weighing scale for weight my hide glue mixture.
Next to come will be gluing the bridge... Stay tune

2009-06-22

Fingerboard

Wooden planes vs Metal planes

I bought some more wooden planes at the Kelantan Lane.
After using the wooden plane I have grew to like it more.

They are light and handy unlike the western planes which are heavy.
When planing top down, the western plane it's a good thing as the additional weight will be an advantage.
However when shooting the sides, it will be bulky and difficult to handle.
Using wooden plane requires less energy.

When it comes to adjustment of the iron, it is very easy to adjust the wooden plane. Just a few taps will do the trick. (See previous post)
Adjusting the western plane is quite troublesome.
1) Loosen the iron cap
2) Adjust the turn screw
3) Lock the iron cap
and repeat until u get the right shavings.
Unlike most wood worker who adjust the plane and leave it alone, I will retract the blade after I use it and re-adjust in the next session.
Well I that's just me...

Whether used in a pull fashion or push fashion, the wooden plane feels the same.
Compared to using the western plane, the push is easy, but pulling is almost impossible.
Japanese kanna (plane) is used in a pull method; but chinese planes are used in a push method.
However, the Chinese plane can easily be used in a pull method.

As I grew to like the wooden plane I will try and see if I can get hold of the larger sized planes.


Wooden plane from big to small.


My family of wooden planes; Look at the plane iron, it's much thicker than the western counter parts.

Fingerboard
Then I worked on the fingerboard cutting the curve for the sound hold region.
I use my paring chisel to remove the material and then smoothen with file and then
finally scraper.
I find that the scraper works better than sandpaper in giving a smoother finish.

I encounter a serious problem with the finger.
In the normal sequence of building, the neck is a rough neck as in the main body of the neck is shaped last after the fingerboard is glued in.
My neck was a pre-made neck so I had to fit the fingerboard to fit the neck.
The problem I face was that after fitting the fingerboard, I discover the fingerboard wasn't square to the center line.
This will cause intonation tuning issues.
Thus to compensate I had to reduce the fingerboard width at the neck from 52mm to about 48-49mm.
Not much problem there as my Gutmeier had a 49mm neck at the nut.
After dealing with this issue, I discover even the simple thing as fingerboard is not so simple as it seems.
This explains why other luthiers build jigs to simplify the process and most importantly to make the fingerboard consistently fitting and square to the center line.
In my next build I'll probably build a jig for this.

In a way, well having more problem means building up more experience.
I am glad that I manage to overcome this.


Cutting the fingerboard with the coping saw


Another view


Removing the material using the paring chisel


From the other way


Reversing blade to follow the curve better.


Close up of the chiselling


Using file to shape the curves


The clamping set up


The final product w/o the scraping yet.


Front view


Close up view


Close up view the other angle


From the neck view. U can see the center line which I drew.


Sharpening the tools
Well in order now to fit the neck to the fingerboard, I had to remove some neck material.
I got a spokeshave lying around somewhere.
I didn't use it last time because the blade had some burr which damage my sides...
So I to try my hands at sharpening.
First I straighten the back first on the rough grit (gotta check the numbers) and then on the fine grit.
Then I sharpen the bevel.
I make use of my honing guide, but I discover I worked faster using free hand.
Just a few strokes the plane iron was as good as it can be.
I never knew sharpening can be so easy?
Then I try my hands at sharpening the block plane iron (which had some nicks in it) and then some chisels.
All was done free hand.
I am glad it's so easy; Sometimes to get things going we just have to follow the Nike's slogan (Just do it).


Front view of the chisel


Back view of the chisel


Flattening the back


Sharpening the beveled edge. All this is done free hand because the honing guide doesn't really grip well.


Block plane iron with the honing guide.