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Kerf is the width of a void cause by tooling. It can be from a blow torch to a scribe point.

Hey Colin,  I would be interested to know how you make your laminated linings as well.  John Bogdonovich talks about it in his book.  Are yours made similiarly?  Male and female cauls.  Do you mill the stock yourself or buy it?  thanks.

It's okay, Steve's a caveman and darn proud of it. Kerf On.

Michael says it's a void. So, maybe in the future we should just avoid the topic entirely, eh?   

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http://www.dickeyguitars.com

I learned about "kerfing" 30 years ago when I built a dome for an observatory. I made a rib structure and covered it with 1/2" plywood. No way to bend plywood in two directions without kerfs. BTW, the dome worked great, 10' diameter and it rotated on a bearing race full of golf balls.

I now buy my kerffed material from Allied.

Ron

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OLD MAN formerly (and formally) known as:

Ron Wisdom

Somewhere in the middle of Arkansas......

That sounds like a cool project, Ron. What kind of 'scope went into it?

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Howard Klepper
http://www.klepperguitars.com

When all else fails, clean the shop.

Waddy,

The tentellones are placed close together and are square as the contact the side and top. The only reason why Jose Romanillos alternates the sizes of the tentellones is that it staggers the line which then hides any difference in spacing when it comes to crass braces or against the heel or tail block. The tentellones are glued in with fish glue one at a time and because of the high tack of the fish glue you just place a block pressing it in place and then count to 10...by the time you do the glued in tentelonne with hold and you can move to the next...nothing more is needed and the fish glue holds really well.

Because fish glue dries to a hard crystalline structure like hot hide glue, the blocks hold well and transmit sound better than a softer glue.

In a traditional Spanish school guitar the top is not a consistent dome but rather meets the side at a 90 degree angle and then is domed as the braces are pressed and glued against the top into the curvature of the solera. The Romanillos method is to thin the outer 20 - 25mm to ~1.8mm around the perimeter of the lower bout which makes it easier to keep the sides square and still have the top conform the dish of the solera.

The fan bracing is not shaped to the curvature of the dished solera but are pressed into the curve of the dish when glued. Some builders glue their bracing for the top by putting the solera into a go bar clamp while some builders have various clamp setups that use threaded rods to press the bracing into the solera. It doesnt matter as much the method of clamping as bracing is glued to the curvature of the dish of the solera.

For my solera the lowest part of the dish is approximately 4- 4.5mm deep so that when I take the tops and solera out of the go bar deck after very slight springback the top is still domed in the area of the bridge about ~3mm so that if the neck is forward by about 2.5 - 3mm at the nut and the top is dome ~3mm, it is easy to adjust the action by just changing the height of the saddle.

[QUOTE=Howard Klepper] That sounds like a cool project, Ron. What kind of 'scope went into it?[/QUOTE]


We had a Meade 10" Newtonian and a Meade 8" Cassegrain. The scopes actually belonged to the school where I taught physics, but I built the observatory at my house so we could get away from the city lights.


This is not mine in the photo, but is my design: as far as I can tell. I did an article about it in Telescope Making magazine back in the early 80's.







Ron

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OLD MAN formerly (and formally) known as:

Ron Wisdom

Somewhere in the middle of Arkansas......

Nothing like observing where kerfing will pop up next! Ron, that's cool, and the golfers will love this part of the tread along with us kerfers.

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http://www.dickeyguitars.com

h

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http://www.dickeyguitars.com

My students "found" the golf balls for me at the local driving range. I think it took about 150.

Ron

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OLD MAN formerly (and formally) known as:

Ron Wisdom

Somewhere in the middle of Arkansas......

[QUOTE=terken] I used to run a driving range. Ball theft was not a "wink wink smiley face" in
my book. One evening a station wagon pulled up at the far end of the range
and out popped three kids with sand pails picking up balls. Dad was in the
car. When I confronted them they said their dad told them they were free!
Maybe they went on to be your students, who knows?
TJK[/QUOTE]


I looked at that post carefully and saw no "wink wink smiley face" , I saw an embarassed face.

Ron

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OLD MAN formerly (and formally) known as:

Ron Wisdom

Somewhere in the middle of Arkansas......

Gee Terry,

I am sure that would have been very frustrating for you and I can well understand your point of view, but I doubt that people building backyard domed observatories would have been the root core of your pillaging problem.

Cheers

Kim

I built myself a ksled today !!

took me all day long to figure it out and get the ribbon to advance in eqal steps, but I got it !!  Now I can begin to make some use of all of that mahogany I bought on ebay.

Next project will be to make a batch of neck plates and butt plates.

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Reguards,

Ken H

In John Bogdanovich's Classical Guitar making he explains how to make laminated linings. You making them by resawing mahogany into thin strips and then laminating 4 thin pieces 32 inches long, 5/8 inches wide and .045 inches thick. Once the 4 pieces are glued up you clamp them in a mold with the same outline as your side.

Once dried remove from the mold and use a router to round over the inside edge. (the edge not glued to the soundboard or back.)


It seems like a lot of work, but goes pretty quick. The end result is a strong lining preshaped to the contour of the side. They look nice too.

I made 8 over the past week which I have been gluing onto sides today.


Here are a couple of linings I made this week.

This is the mold.

This is a side where I am gluing on the linings.


Darin

Those are very nice looking linings and that's the first time I've seen linings installed before the sides are joined to the head and tail blocks. Looking good.

Ron

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OLD MAN formerly (and formally) known as:

Ron Wisdom

Somewhere in the middle of Arkansas......

[QUOTE=Hodges_Guitars]

I built myself a ksled today !!

took me all day long to figure it out and get the ribbon to advance in eqal steps, but I got it !!  Now I can begin to make some use of all of that mahogany I bought on ebay.

Next project will be to make a batch of neck plates and butt plates.

[/QUOTE]

Excellent Did you use the instructions from the site I have hosted?? If so, let me know if I need to edit to make things clearer, I don't want people having to futz around all day to get it to work.

But I guess even if you do need to futz around a little at first, the Ksled is well worth every effort. Once you do have it worked out, you got yourself free kerfed linings, of any style you desire, with any kerf spacing you wish to select, and you can make them quickly and easily in your own shop.

Cheers

Kim

[QUOTE=old man] Those are very nice looking linings and that's the first time I've seen linings installed before the sides are joined to the head and tail blocks. Looking good.

Ron[/QUOTE]

Bogdanovich, first glues the linings up against the side mold, and then once it has dried, marks and removes the lining area where the head and tail blocks are joined.

This is my first build so I will see how it goes, but I took the side pictured above out of the mold this morning, and it is perfectly formed and surprisingly strong.

[QUOTE=larkim] [QUOTE=Hodges_Guitars]

I built myself a ksled today !!

took me all day long to figure it out and get the ribbon to advance in eqal steps, but I got it !!  Now I can begin to make some use of all of that mahogany I bought on ebay.

Next project will be to make a batch of neck plates and butt plates.

[/QUOTE]

Excellent Did you use the instructions from the site I have hosted?? If so, let me know if I need to edit to make things clearer, I don't want people having to futz around all day to get it to work.

But I guess even if you do need to futz around a little at first, the Ksled is well worth every effort. Once you do have it worked out, you got yourself free kerfed linings, of any style you desire, with any kerf spacing you wish to select, and you can make them quickly and easily in your own shop.

Cheers

Kim[/QUOTE]

 

Kim,

I took a look at your instructions page, then went out and built one with what I had to work with. In other words, My cave man mentality kicked in and I built it the way I wanted to build it using the idea you had posted on your page. I could have probably saved time by following the directions, but what fun would that have been?

  Ken

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Reguards,

Ken H