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| Kerfed lining size for classicals http://www.luthiersforum.com/forum/viewtopic.php?f=10101&t=28765 |
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| Author: | John A [ Wed Aug 25, 2010 9:15 am ] |
| Post subject: | Kerfed lining size for classicals |
HI everyone, I am making kerfed lining. I am finding it difficult to work with the dimensions that my plan calls for, which is 3/16 x 5/8 - This is how it is stated in the Cumpiano book. I cut my pieces from Basswood, then hand planed down to the right size. Although the size varies a little in the piece. Then I have to cut a corner off lengthwise to make it more of a triangle shape. Either way working with that size is discouraging. The size also looks unusually tall to me as well. So I got a strip of basswood, 1/4 x 1/2 (+ or - a 1/32 or so) -- I can cut this wood to the proper shape using my band saw and the table tilted all the way. This is very encouraging. SO my question is - can I use my slightly wider and slightly shorter kerfed lining, rather than what is stated in the Cumpiano book ? If needed I can plan the 1/4 side down to 3/16 so less is touching the sound board. Will the 1/2 inch be enough to hold grab on to the sides ? What size does everyone else use ? Keep in mind this is a classical with regular kerfed lining. |
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| Author: | Alexandru Marian [ Wed Aug 25, 2010 9:35 am ] |
| Post subject: | Re: Kerfed lining size for classicals |
Definitely go ahead and use it, 1/4x1/2 is fine. Cumpiano's width strikes me as too narrow if you'd want bold purfling. As an example Romanillos' blocks are even wider, 8 and 10mm (alternating) and not much taller. My standard 15x5.5 (I prefer them to be 1/4 for wide purfing btw so I make my own now) reverse kerfed linings often end up at less than 12mm in the UB after I refine the depth and slope of the guitar. |
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| Author: | WaddyThomson [ Wed Aug 25, 2010 10:06 am ] |
| Post subject: | Re: Kerfed lining size for classicals |
Alexandru Marian wrote: As an example Romanillos' blocks are even wider, 8 and 10mm (alternating) and not much taller. Actually they are all 8 mm wide and alternate between 8 & 10 mm in height. Not that that is important! I agree that the 1/4 x 1/2 would be fine. You can even shape it with a plane. before kerfing it. All you'd have to do is knock the corner off and make a reverse kerf, which is what I've been using until my most recent. What I like about the reverse kerf is that it soaks up the squeeze out, instead of showing it off. |
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| Author: | Alexandru Marian [ Wed Aug 25, 2010 11:15 am ] |
| Post subject: | Re: Kerfed lining size for classicals |
Poor cat. This is what I had in mind. I forgot the name but it's one of Romanillos students. |
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| Author: | Steve Kinnaird [ Wed Aug 25, 2010 12:19 pm ] |
| Post subject: | Re: Kerfed lining size for classicals |
Sounds fine to me as well. Oooh, Alexandru, got any more pics of that bracing? Wondering if there was/is some sort of diagonal bar installed for shoring up the treble? Steve |
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| Author: | Alexandru Marian [ Wed Aug 25, 2010 12:40 pm ] |
| Post subject: | Re: Kerfed lining size for classicals |
Nop, the Romanillos design is the one with the least crossgrain patching. All harmonic bars are open, fan braces have a high focal almost like a flamenco. On the other hand, the shape is small, 353mm LB or so, not too long either, lining is wide, cutoff bars have little influence, and the bridge is long and stiff. The treble bar contraption is much more useful on a larger, say 370mm wide guitar. |
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| Author: | WaddyThomson [ Wed Aug 25, 2010 12:52 pm ] |
| Post subject: | Re: Kerfed lining size for classicals |
Interesting picture. I see he only has one finger brace in the upper bout and a short neck brace, instead of an open brace. Wonder if he uses smaller openings in the Harmonic Bars since he only has one finger brace. He also uses a bridge patch, unusual on this design. Otherwise, it looks familiar. |
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| Author: | Howard Klepper [ Wed Aug 25, 2010 1:17 pm ] |
| Post subject: | Re: Kerfed lining size for classicals |
My rule of thumb is that the liners should extend a minimum of 3mm, and preferably more like 4mm inside your purfling lines. 6mm or 1/4" is about the thinnest liner I use. |
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