colins
Luthier / Guitar Maker
Posts: 2,397 
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Post by colins on Oct 7, 2018 11:03:42 GMT
Over the years I have made literally hundreds of laminated linings for my guitars. Simple process, thin strips of spruce and hardwood to 1.25mm, apply glue and press in mould until glue dries, repeat three more times.
Like this: 
I did it again yesterday for a forthcoming guitar, only I had to make five this time, spot my mistake.
Even I am not perfect apparently.
Colin
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Post by Onechordtrick on Oct 7, 2018 11:47:04 GMT
Oops!
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leoroberts
C.O.G. 
Posts: 26,148
My main instrument is: probably needing new strings
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Post by leoroberts on Oct 8, 2018 9:08:15 GMT
I’m sure it’s obvious, colins, but I’m blowed if I can see what the issue is. I’m thick. |
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colins
Luthier / Guitar Maker
Posts: 2,397
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Post by colins on Oct 8, 2018 9:28:24 GMT
leoroberts if you look you'll see that four have the mahogany on the inside show face, the fifth on the outside gluing face. Colin
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Post by bleatoid on Oct 8, 2018 10:25:05 GMT
It always warms the cockles, doesn't it, when one pauses a while, and refrains from being the first to put one's hands up in class. Thank you leoroberts for thrusting your head above the parapet on that one. (My own detailed analysis of the evidence had led me to conclude that colins was referring to the fact that he'd forgotten to string it up). Peter |
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Post by Deleted on Oct 8, 2018 11:07:24 GMT
I'm with you leoroberts. Glad you asked first cos the obvious thing to me was I could see 5 bits of wood and I thought maybe there should have been 6.
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Post by andy3sheds on Oct 13, 2018 20:37:23 GMT
And more thanks Leo I couldn't see any reason for there being five
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Post by Alan J on Oct 14, 2018 13:20:49 GMT
Do you find it to be better for tone to use different wood types for the linings or is this an aesthetic choice?
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Post by andyhowell on Oct 16, 2018 17:56:35 GMT
Do you find it to be better for tone to use different wood types for the linings or is this an aesthetic choice? I believe it gives a thicker and stiffer side which allows the top to be thinner? |
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colins
Luthier / Guitar Maker
Posts: 2,397
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Post by colins on Oct 16, 2018 19:05:56 GMT
Do you find it to be better for tone to use different wood types for the linings or is this an aesthetic choice? I believe it gives a thicker and stiffer side which allows the top to be thinner? , Andy is correct, my use of laminated linings produces a very stiff side without the additional weight of fully laminated sides. This side stiffness allows me to use a very responsive top plate. I use the spruce plys of course to save weight, and the mahogany show face purely for aesthetic reasons. I have used a variety of hardwood faces, often a match for the side wood. |
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Post by Alan J on Oct 16, 2018 20:30:00 GMT
Think I might give this a bash this week. How many strips of spruce/mahogany are you using 3 or 4? I guess 4 at that thickness.
Im curious about exactly why they might make a difference. Gore/Gillet contend that increasing the mass of the sides allows the soundboard to resonate better at it is affixed to a more solid frame. I guess that the added stiffness of your linings assists in this general principle as it relieves the soundboard of its duty of care to keep the shape of the guitar constant in a way that kerfed lining won’t.
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colins
Luthier / Guitar Maker
Posts: 2,397
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Post by colins on Oct 16, 2018 22:10:02 GMT
Yes three spruce and one mahogany, for a total thickness of 5mm, once the linings are glued in I dispense with the mould as the rim set is completely rigid. The linings are effectively an engineered wood structure, they will determine the final shape of the guitar, so the mould used to make them has to be correctly formed.
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Post by Alan J on Oct 18, 2018 8:02:43 GMT
Another question.
My tops have a radius of 9m and my backs have a radius of 3m. How do you build your laminated linings with a view to keep a uniform height of lining all around the rim?
In my mind reduced lining height at the neck and butt ends would be an acceptable compromise for the extra stiffness in the sides.
i am going to try laminated all the way around the sides, overlapping through the bottom of the guitar. This will mean a 66mm high end block instead of the full 100mm.
Have you tried this? I can’t think of a downside.
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Post by linn on Oct 18, 2018 9:58:52 GMT
Do you use side supports with these linings?
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colins
Luthier / Guitar Maker
Posts: 2,397
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Post by colins on Oct 18, 2018 13:18:09 GMT
Another question. My tops have a radius of 9m and my backs have a radius of 3m. How do you build your laminated linings with a view to keep a uniform height of lining all around the rim? In my mind reduced lining height at the neck and butt ends would be an acceptable compromise for the extra stiffness in the sides. i am going to try laminated all the way around the sides, overlapping through the bottom of the guitar. This will mean a 66mm high end block instead of the full 100mm. Have you tried this? I can’t think of a downside. I would not personally use a shorter end block and continuous linings on my guitars, especially if they are to be used with a strap button, this puts a lot of strain on the end of the guitar at a single point and a week point would then exist between the linings and the end block running with the rim grain line. There is no problem with the linings on the radius, just glue them on with minimum proud at the high point and plane and sand to profile. I start with 18mm high linings and end up with a minimum of about 14mm, that's plenty. |
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Jo whoever he is.
