Australian/New Zealand Luthiers Forum

Oh, thanks!

I was just about to post saying I could imagine no other way to do it accurately than ripping binding strips from the pre-bent, pre-profiled sides when I noticed Allen's post, which I've just been thinking about. Allen, if you I could ask: how did you manage to cut the strips to conform to the longi...

Many thanks indeed Trevor. I don't know why I didn't see that all the separate components involved just go into Eqn 4.4-2... Before, I was figuring out the values for each brace, including the section of soundboard underneath and then wondering how to put it all together. Anyway, thanks again. My sp...

Thanks a lot for going through that Trevor, that's very clear. I've calculated the correct value for the worked example on p.4-38 but forgive me if I am a bit slow: while I can see how you calculate the value for an individual brace, I can't see how an overall value for the stiffness across the soun...

I have been scratching my head over how to calculate the flexural rigidity across the soundboard span and wondered if anyone could help set this straight for me? I can see clearly how to get the second moment of area I and Flexural Rigidity EI through one brace-soundboard section. But I can't see ho...

I was in a similar situation to you when I first got the books. While it's possible to get by passing over most of the maths and reading the chapter summaries, I felt there was a lot of stuff in there that I would like to understand. You may well be able to pick enough up from here to apply the idea...

Actually, scrub those last values (I'd changed the parameters slightly). Using the parameters from the book (p. 2-37) I get:


Dbar at 99.8Hz:

Step-by-step evaluation:

17109250024919600-14664066332842700i


Evaluation as per Eq AII 2-44:

2921776425179630-31456091755907500i

Hi all, Just joined this forum (even if it is based on the other side of the planet), although I have been lurking here for some time. I bought "The books" a while back and have spent the past year or so getting to grips with maths in the hope of understanding the Design Book. When I first opened th...