New Design Proto Build - Lyra

Mars Hall

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It seems you're taking Ted McCarty's ES-3X5 design to logical next level. I already want one! I'm trying to gather how you'll tune the top, from the outside of the body or do you plan to tune it from the inside through the vent holes?
 

preeb

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It seems you're taking Ted McCarty's ES-3X5 design to logical next level. I already want one! I'm trying to gather how you'll tune the top, from the outside of the body or do you plan to tune it from the inside through the vent holes?

One of the reasons the Lyra body can only be machined on a cnc is the top tuning process. Top carve profile is fixed but the top thickness will be used to tune it like it's done on classical and flamenco guitar tops. I will run the same carving program again and again while changing the depth of cut and tapping to test the tune until I get to the desired Timbre
 
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preeb

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Fully hollowed arched top
It may be obvious, but could you describe the differences in the Bone Voyage and this new design?

Too many to count. in a few words... semi hollow vs fully hollowed arch top.
I suggest you visit the Bone Voyage build thread to see what it's all about and then wait for this thread to end. At that point you will have your answer.
 

preeb

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I will not get into detail about the neck as it is mostly similar to my Bone line in design...
Here's a few shots from the process

IMG_20190520_083136.jpg~original


IMG_20190520_083443.jpg~original


IMG_20190520_083837.jpg~original


IMG_20190520_084701.jpg~original


IMG_20190520_084635.jpg~original
 

preeb

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Tops need to be carved now in order to tune them along with the backs.
Initial height set with this template. This is the max size and I will continue to thin the top multiple times until I hit the desired tone as previously mentioned

IMG_20190520_081532.jpg~original




Tops are cut

IMG_20190520_090705.jpg~original




Drills and Vent holes are also cut prior to tuning

IMG_20190520_113838.jpg~original


IMG_20190520_114902.jpg~original



I repeat the top carving until I get to the desired note and then thickness the back down to match it
 
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preeb

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To isolate the top and back I lay a small cloth rag on the table and set the body on top of it so what I hear is just the top or just the back tapping

IMG_20190520_091536.jpg~original




Here's the final tuning vids:


The Mahogany top/back







And the maple







Even though the tap volume is about the same between the models, the Maple top timbre is still noticeably different than the Mahogany in both note and color
 

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deytookerjaabs

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Awesome!

Think you'll ever spec one like the early Gibson electric doublenecks (only with one neck, lol)? think they had a hollowed out maple body with a carved spruce top, no top holes/vents though.
 

preeb

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It's a little funny to see the body almost complete but kept in the rectangular blank shape..
The reason for this is the need to have a flat base on the top side to set the body for the back cavities routing

IMG_20190520_114642.jpg~original




Done

IMG_20190520_114840.jpg~original


IMG_20190520_114843.jpg~original



You can now view the floating top from the inside

IMG_20190520_115045.jpg~original


IMG_20190520_113947.jpg~original


IMG_20190520_113950.jpg~original




The STP insert drill is deeper than standard with the opening on the top only being slightly larger to allow the top to freely vibrate while the STP is still anchored to the mahogany core.
This is an important part of the Lyra's design where the strings are anchored like on a solid body but the bridge itself is connected to the floating top to vibrate it properly.

IMG_20190520_115023.jpg~original
 
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preeb

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Worth mentioning... I have an old original Kalamazoo 335 top I use for templates..etc.. and comparing the thickness I found it to be identical after sanding to the Lyra's sweet spot thickness. Does it mean anything? I don't know but it is interesting.

IMG_20190521_133640.jpg~original


IMG_20190521_133647.jpg~original
 

preeb

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Mortise is cut to accommodate the neck tenon at a low 3.8° angle. I'm using triangular jigs for different angles

IMG_20190522_070516.jpg~original



Cut

IMG_20190522_071128.jpg~original


IMG_20190522_071854.jpg~original




Outline is cut

IMG_20190522_082121.jpg~original


IMG_20190522_082418.jpg~original


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and the rims are sanded to remove any routing marks to a smooth clean surface

IMG_20190522_090451.jpg~original


IMG_20190522_091727.jpg~original


IMG_20190522_091806.jpg~original
 

preeb

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The Lyra body will not get any binding. I want a super comfy round-over on the top and back edges.
Plus.. I believe it will look awesome with the deep top re-curves (-;

I will use this dome jig to run the top edge rounding manually

IMG_20190521_132330.jpg~original


IMG_20190521_132333.jpg~original



This is a two hand delicate operation so no photos...
but it looks like that when done..

IMG_20190522_092050.jpg~original


IMG_20190522_092040.jpg~original


IMG_20190522_092036.jpg~original



and the back is done normally on a flat table

IMG_20190522_095217.jpg~original




I stopped the rounding in the middle of the cutaways and will blend them in with a file after the neck is glued and the heel is carved...
 
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BluesBlooded

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Superb work Gil.

I like the idea of the triangle shim under the body for the angle neck pocket. I use a 3D cut in this circumstance, but will keep this technique in the back of my mind.
 

preeb

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Boards are dark Brazilian Rosewood with MOP dots and kept as simple and classic as possible to fit the earthy clean look I'm going for... the Lyra is all about tone and comfort so no real need for fancy stuff (-;

IMG_20190522_103535.jpg~original



Slotted

IMG_20190522_105846.jpg~original




Dry fretted with a hammer

IMG_20190522_110232.jpg~original


IMG_20190522_110935.jpg~original



and checked for zero bowing after frets are installed

IMG_20190522_110946.jpg~original




I now inject thin CA glue under the frets

IMG_20190522_112225.jpg~original




and let it get sucked up to the board surface under the frets

00100lPORTRAIT_00100_BURST20190522112337684_COVER.jpg~original


00100lPORTRAIT_00100_BURST20190522112341870_COVER.jpg~original




Edges are squared along with the fret ends

00100lPORTRAIT_00100_BURST20190522113140838_COVER.jpg~original



Like that

00100lPORTRAIT_00100_BURST20190522113151256_COVER.jpg~original




Even though I opted for no binding on the body I still want them on the board but with a very subtle look... as if they are not there.
Here's a beautiful Italian brown celluloid that matches the Brazilian Rosewood color perfectly

IMG_20190522_113558.jpg~original




Start with the board end edge using clear acetone glue

IMG_20190522_113852.jpg~original




Trimmed

IMG_20190522_114118.jpg~original




and sanded flush

IMG_20190522_114133.jpg~original




Sides follow..

IMG_20190522_114432.jpg~original




and set aside to cure for a couple of hours

IMG_20190522_115420.jpg~original





Neck headstocks are widened for the wider Lyra's headstock outline

IMG_20190522_122334.jpg~original



IMG_20190522_153548_1.jpg~original
 
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