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2009-05-27

Front Binding / Purfing / Fingerboard

Front Binding

After a long drought, finally mananged to find pockets of time to do up the front binding.
After the experience with the rear binding, I am more confident on how to go about doing the front binding.

But first I had to chisel the purfling rebate / rabbet at the part near the neck.
This time round I had bought a 2mm chisel by 2Cherries, and chiselling was a breeze.
The channel was well defined unlike the one at the back (I still have yet to solve that problem).

Unfortunately I didn't have my camera with me when I did the front binding.
So I didn't managed to take any pictures.
Essentially the steps are the are the same as the rear bindings.
This time round there is an additional herringbone purfling to take care of.
I glued the purfling channel first before embarking on the binding.
It was a hard work trying to keep the purfling in place due to the spring back.
I bent it cold w/o any heat as I was afraid that heat might disintegrate the purfling.

This time round I make sure the purfling and binding was cut accurately to size.
So it was just a matter of glueing them up.
After glueing them besides the usual tape to hold them down (which isn't strong enough) I also employed rope.
Now I use 2 coils rather than only 1 coil.
The tension was able to keep the binding in place w/o much gaps.
Gaps are still present due to the lousy rebate which I did previously.
I guess there is no way remedying.


I use rope to add pressure to the binding tape (which isn't strong at all).


This time round I make sure I have sufficient length (2 rolls of string instead of 1). The tape is to increase the pressure abit more


Close up of the tying.


Another view


After removing the strings.


The tape removed. looks good :)


Close up at the waist region


Some gaps at the tail region. Still thinking how fill the gap.


Another view


Another one at the waist


At the neck region. The 2 mm chisel was very useful in chiseling the channel.
If not the binding won't fit so snuggly.


Another view


Upper bout


The whole view


Upper bout


From the neck


Some chips at the neck


Marks left by scrapper's edges...


Improper cut channel




Finger board
After working on the binding, I began to work on the fingerboard.
Unfortunately, I discovered something bad; the fingerboard had bowed....
Strange, I had kept it inside a humidity controlled box, and the ends are sealed.
Yet it still managed to be bowed.
The displacement was about 1 mm in the middle.

After consulting with experts at the Delcamp forum, I was told to plane it flat.
I kept my scraper (about 1mm thick) supporting the middle of bowed region and plane the other side flat.
At first I tried to use my #8 jointer, but to my horror I discover the jointer was faulty...
The adjustment screw was stuck to the frog.
Even with pliers, I did not manage to make it turn.
How unfortunate.
In the end I use my regular #4 Bench plane to do the job.
The block plane did not cut that well.
My wooden bench plane's iron was surprisingly very hard.
Ebony was definitely a hard wood to plane.
After some hard work, I managed to plane it near flat.
Now to fit the neck and cut to and plane to size.


Bowed finger board


Clamping to ensure that it is straight.


Next will be fingerboard and bridge.

Finally I get to work on the finger board.
After consulting my luthier friends in Delcamp forum, I decide to plane the bowed fingerboard flat.
I put a piece of support (my scraper which is about 1mm thick) undernearth the bowed region and plane the middle belly part.
After the part is flat, then I turn around and plane the other side flat at the ends.
Well after some work its nearly flat (still not exactly very flat), the gluing should the trick after that.

Now the next problem is to plane the fingerboard to fit the neck.
My neck is a pre-made neck and so I need to make sure the finger board shape fits the neck.
So I trace the shape from the neck and transfer to the fingerboard using a vanguard sheet.
As first I saw away the sides excess and plane away the rest to fit using the shooting board method.



Planing the side using the shooting board method


Another view

Then after I plane the part after the 12th fret the part which is in the upper bout.
At first when I join the neck to the body I made sure it was with no forward angle.
But after my careless mistake in the front binding all that, it ended up with some slight forward angle.
So I need to plane the fingerboard to fit.

I tried 3 planes for the job, Stanley #4, Stanley Block plane and my Taiwanese made wooden plane.
It ended up that the best fit tool was the wooden plane...
The block plane was good but the blade was too thin, and after some rounds of ebony planing the blade had kinks and needs to be sharpen.
The #4 was too bulky to use.
The wooden plane was light and handy to use.
Adjustment of the plane was simple too. (see below section)

To plane the part above the 12th fret region, I clamp a piece of wood which also acts as the stopper making sure that the blade will not plane within the 12th fret region.


The wood act as a stopper for the plane to ensure that the blade doesnt plane the region within the 12th fret region


Another view. The pencil line marks the 12th fret.


Another view.


Slight ramping down at the ends


In the end I use another piece of wood underneath for better support.


And scrap for smoother finish (still pretty rough though)


See the fingerboard on the neck.


Another view.


Closer up view


From the front

Plane blade
Surprisingly the cheap wooden plane which I bought was functioning exceptionally well.
The blade was hard and can plane the ebony perfectly.
The Stanley block plane was having trouble planing the hardwood (ebony).
After some pass the block plane blade was having some kinks in it.
Comparing the thickness of the blade it's not hard to know why.


The block plane blade. Note the kink in the middle


The wooden plane blade


Another lighting view


Comparing the thickness of the blade.


Setting up the wooden plane


1) Put the body on the table top.




2) Place the blade in the slot. Made sure the edge is touching the table top.


3) Put the wedge in.


4) Tap the wedge tight.


5) The blade should be just protruding from the bottom.


6) To loosen, simply tap the end of the block.

7) If the blade is skew slight can just tap the blade slightly to correct the skew.

Correcting the skew iron by tapping on the left


Correcting the skew iron by tapping on the right

2009-03-12

Binding / Purfling Cutter

Cutting the top binding rebate
I finally had the chance to cut the top binding rebate after lazing around for so long.
Being able the work on the woods again, I felt really touched.
The sound of the guitar was really singing in my mind then.

Anyway enough of the crap, back to the session.
For this session, I managed to try both methods of the cutting the binding rebate:
- Using the trimmer
- Using purfling cutter and chisel

As the top was relatively flat at the edges, I decide not to built the trimmer jig.
The profile of the trimmer based wasn't too big.
The deciding factor was that it is simply taking too long a time to build the jig.
Often in guitar making it's always a dilemma in deciding to build jigs or just simply work on it.
Perhaps when I am at my #3 or so the jig(s) will come in handy.
For this case, I wanted to see some progress after lagging behind for so long, and so I simply use the trimer as it is.
But this time round I had some vanguard sheet to make sure the dust generated is sprewn onto the ground instead of all over the place.


The vanguard to make the dust dropped down instead of flying all over.

With the vaccum cleaner, the cleaning up process was much easier.

At first when I cut the binding rebate, the top sides were frayed... (forgot to get some pictures).
From what I read at OLF, this was due to the bit.
A down-spiral router bit would prevent such a problem.
Another way is to scribe the line first before the routing process.
And so for the 2nd side, I use the purfling cutter to scribe the top first before I use the trimmer.
The end result was much better.
Anyway the frayed sides were removed when I cut the top purfling rebate.

Here are some pics of the top binding rebate.



The only problem with the binding rebate was at the end near the heal region.
It is definitely high time to get a 2mm micro chisel.
In the end I had to use Xacto blade to cut and remove the excesss.
And it doesn't look pretty.



The purfling cutter
I wanted to try the old way of cutting the binding rebate.
Firstly I scribed the top and sides with the purfling cutter which I had made.
And then I removed the excess wood using the chisel.
When inverted, (i.e. bevel-side facing down), the chisel acts like a plane.
I was able to remove a thin slice using the reversed way.

The swan neck paring chisel by 2-Cheries was quite useful at the waist bend.
The other normal bevel-edged chisels which I used was abit too short, I think I would prefer a longer paring chisel.

I made the purfling cutter using some scrap basswood which I had.
I cut the basswood to size and glued it together using PVA.
The main body was simply 2 long pieces with a gap at the end for the bolt to pass through.
The blade end was glued with a T-nut within for securing the blade.

The blade was a skewed chisel which I had gotten it at Daiso.
To extract the blade, I removed the wooden handle.
The blade was held in place using a hex-bolt which was screwed into the T-nut hidden within the cutter body.

For the bottom piece, I use some more cylindrical wood which I got at Daiso too.
The bottom piece is attached to the top via a hex-bolt and winged-nut.
The round fence is abit long though.
I would shorten it someday.
Probably at about half the current length, the fence would be just nice.

Here are some pics of the purfling cutter.


Side view


Top view. The bottom piece is held in place using the wing-nut and the bolt.


Angle view. You can see the screw which I use to hold the blade in place.



Scribing the rebate


Another view. Here we are scribe the side. For the top we just turn the purfling cutter around.
The round fence is abit long though.


Chiselling the excess. The bevel edge is inverted.


Chiselling the purfling.

The #8 jointer
My new toy for the day...
I managed to get a Anant #8 Jointer Plane off Ebay.
At full 2' or 24" or 60cm in length, it's really heavy, boy.
The rear handle was abit loose but a few rounds to tighten the screw will probably remedy it.
Unfortunately I didn't have time to tune it.
That's a job for another day...

Here are some pics


Side view


It is 24" long


Angled view. Anant #8


The base. I think it looks flat enough. Not sure if I want to lap it or not.


The frog part.