Sycamore back thickness (Full Version)

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aqualibguitars -> Sycamore back thickness (May 5 2020 20:20:54)

Hello friends. i hope all of u are safe from corona.
im building my 4th flamenco ( 1st from solid sycamore back and sides)

i have made 4 pc back from sycamore. thicknessed to 2.2 mm
the weight of back is around 198 grams ( cut 6mm over size from the edges)

is it sufficient or shall i thin it down more?
does anyone weigh their backs before gluing the back braces?

shall i glue centre reinforcement strips on all joints or just in middle?
waiting for ur advices
thanks in advance



constructordeguitarras -> RE: Sycamore back thickness (May 10 2020 14:15:34)

2.2 mm sounds like a good back thickness. I usually make them about 2.4 mm thick in the center and a little thinner towards the sides.

Whether to reinforce all the seams or just the center one is a good question. It seems to me that if the center seam needs it, then they all do. I have done it both ways, using Titebond glue for the seams, and had no problems either way.



aqualibguitars -> RE: Sycamore back thickness (May 11 2020 19:54:39)

sir thanks for ur response.
i will use it as it is
can i use peons on other joints as used traditionally?



ernandez R -> RE: Sycamore back thickness (May 11 2020 21:31:31)

Aqualib,
Could depend on how figured the back wood and its potential to move around with time or humidity? I've been using 13mm circles of wood anywhere there is 10cm or more of unsupported back seam. Hard telling if it is enough but I'm building 1000g lightweights with an active back a la radial bracing in the lower bought. I'm seven guitars in so far which means I really don't know what I'm doing except I'm having fun and learning.

Common sense would say to glue reinforcement strips to all seams for longevity but sonically might say not. I like playing an active guitar, she is alive in ones hands of not as noisy out in front.

Super curious about your sycamore! Photos? Source? Etc?

HR



aqualibguitars -> RE: Sycamore back thickness (May 12 2020 19:53:19)

yes sir. i will upload pics tmrw
what is active guitar? what are its benefits?
any pics will be appreciated



ernandez R -> RE: Sycamore back thickness (May 17 2020 4:06:01)

Active back is what I meant to type
Instead of having a continuous brace across the lower bought there is a radial pattern of sound bars allowing the back to resonate. It’s not “better” It’s just more personal kinda like a sound port in that you get more sound playing it. Although it does not mess with the sound hole frequency. To be honest I just liked the idea and have incorporated it in my first six builds, not in my parlor guitars but I might who knows.
Tried to load a photo but it was too big :/

HR



ernandez R -> RE: Sycamore back thickness (May 17 2020 19:11:01)

Here is the photo:



Images are resized automatically to a maximum width of 800px



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