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PostPosted: Sun Jul 29, 2018 9:43 pm 
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Cocobolo
Cocobolo

Joined: Fri Feb 24, 2017 8:43 am
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What is your top thickness ? Just curious.
As for getting the rosette and purfling flat a good sharp block plane always gets it close enough to sand for me


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PostPosted: Mon Jul 30, 2018 6:38 am 
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Walnut
Walnut

Joined: Sat Jun 16, 2012 7:33 am
Posts: 18
First name: John
Last Name: Geisen
Focus: Build
Status: Amateur
SnowManSnow wrote:
What is your top thickness ? Just curious.
As for getting the rosette and purfling flat a good sharp block plane always gets it close enough to sand for me


My top is currently .095. I plan to take a little off of the perimeter after it is a box. Probably .005. Maybe .010.

I was worried about taking off too much with a plane. I started pretty thin so I don't want to remove any more material than I have to. I barely touched the top with the scraper. Just a little Primavera dust, no shavings. I'm waiting until I'm close to completion to start leveling things. I'll leave more thickness to work with on the next guitar I build.

Now, how should I fill the cracks between the soundboard and purfling?

I'd like to use a black filler of some kind. I have black CA but I believe that will discolor the lighter top over time.


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PostPosted: Tue Aug 07, 2018 6:12 am 
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Walnut
Walnut

Joined: Sat Jun 16, 2012 7:33 am
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Last Name: Geisen
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Status: Amateur
Image

Image

Image

Image

Image


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PostPosted: Tue Aug 07, 2018 6:13 am 
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Walnut
Walnut

Joined: Sat Jun 16, 2012 7:33 am
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So I think I'm ready to close up the box.

Does anyone have a checklist they run through before closing it up?

What am I forgetting?

Thanks.


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PostPosted: Tue Aug 07, 2018 1:04 pm 
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Brazilian Rosewood
Brazilian Rosewood

Joined: Wed Apr 08, 2009 9:34 am
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I'd put a big triangular bevel on each side of that neck block.
T/R hole/slot?
What is 2nd photo above? I sure would cover that joint...make a really wide butt wedge.

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PostPosted: Tue Aug 07, 2018 4:37 pm 
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Brazilian Rosewood
Brazilian Rosewood
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Joined: Thu Feb 12, 2009 12:12 pm
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First name: Bryan
Last Name: Bear
City: St. Louis
State: Mo
Country: USA
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Status: Amateur
Make a fitted bridge gluing caul now while you can see what you are doing.

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Take care of your feet, and your feet will take care of you.


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PostPosted: Tue Aug 07, 2018 8:25 pm 
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Walnut
Walnut

Joined: Sat Jun 16, 2012 7:33 am
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First name: John
Last Name: Geisen
Focus: Build
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Haans wrote:
I'd put a big triangular bevel on each side of that neck block.
T/R hole/slot?
What is 2nd photo above? I sure would cover that joint...make a really wide butt wedge.


Yeah, I screwed up the bending. I have a plan for the butt joint.

Why bevel the neck block?

Oops, forgot about the truss rod. Thanks!


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PostPosted: Tue Aug 07, 2018 8:27 pm 
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Walnut
Walnut

Joined: Sat Jun 16, 2012 7:33 am
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First name: John
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Focus: Build
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Bryan Bear wrote:
Make a fitted bridge gluing caul now while you can see what you are doing.


Nice. Good thinking!


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PostPosted: Wed Aug 08, 2018 7:29 am 
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Brazilian Rosewood
Brazilian Rosewood

Joined: Wed Apr 08, 2009 9:34 am
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You will have a radiused back glued to a block with two sharp points. Any shrinkage of the top due to humidity or string tension may telegraph the points of the neck block.

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PostPosted: Fri Aug 10, 2018 11:56 am 
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Walnut
Walnut

Joined: Sat Jun 16, 2012 7:33 am
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First name: John
Last Name: Geisen
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Cool. So I took your guys' advice and beveled the edges of the neck block and made a bridge caul.

No pics of the caul but here's the neck block:

Image

Image

And here it is all closed up:

Image

Image

I think I may have an issue though. The sides are not flat. They are wavy around the bottom and one side of the lower bout. It looks like it expanded while in the form. The sides are flat and straight all the way around in the middle of the sides but closer to the top and back there is a hump. Mostly near the back on the lower bout.

I noticed that every time I put the form on the guitar it got harder and harder to close. When gluing on the back I almost wasn't able to close it.

The relative humidity in my shop has been climbing steadily since I started building the guitar. I started out with an average temp of about 73 F and 35% RH. Now it is an average temp of 85 F and 43% RH.

The Chechen is really dense so maybe that's causing the waviness. Should I take it inside and let it acclimate a little before trying to level the sides? Inside the house it is usually 74 F and 30% RH.


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