Official Luthiers Forum!
http://www.luthiersforum.com/forum/

TOP and BACK radius for Martin 000-28 ?
http://www.luthiersforum.com/forum/viewtopic.php?f=10101&t=29925
Page 1 of 1

Author:  rdpdo [ Mon Nov 15, 2010 10:55 am ]
Post subject:  TOP and BACK radius for Martin 000-28 ?

Hello,

Does someone have the radius value for the TOP and BACK of the Martin 000-28 ? and for the fingerboard ?

Thanks a lot :)

Author:  Bobby M [ Mon Nov 15, 2010 11:06 am ]
Post subject:  Re: TOP and BACK radius for Martin 000-28 ?

Give John Hall at Bluescreek (sponsor) a call. He'll not only know, but if the radius was ever different by year or any other quark, he can tell you.

Author:  parrotheadmj [ Mon Nov 15, 2010 2:27 pm ]
Post subject:  Re: TOP and BACK radius for Martin 000-28 ?

I purchased my Martin kit from John to give a go at building a 000-28 and he sent me 28' and 15' radius dishes for the top and back respectively.

Marc

Author:  parrotheadmj [ Mon Nov 15, 2010 2:29 pm ]
Post subject:  Re: TOP and BACK radius for Martin 000-28 ?

You also asked about fingerboard radius, John told me it was a 16.

Marc

Author:  rdpdo [ Mon Nov 15, 2010 3:37 pm ]
Post subject:  Re: TOP and BACK radius for Martin 000-28 ?

Hello all;)

Thanks you very much for your help...

John say me that the top is flat and the top braces are 42 foot radius, the back is 15 as for the braces...

[headinwall] gaah duh wow7-eyes

Author:  bluescreek [ Mon Nov 15, 2010 4:39 pm ]
Post subject:  Re: TOP and BACK radius for Martin 000-28 ?

Technically the top has a 1 1/2 degree worked into it. The top of the sound hole to the neck block . The backs are 20 on the dred and 15 on the 000's on down. We use a 28 foot disk as this will equate a 1 1/2 degree angle . The actual martin top bracing is 42 foot radius.

Author:  rdpdo [ Tue Nov 16, 2010 1:22 am ]
Post subject:  Re: TOP and BACK radius for Martin 000-28 ?

Hi !

Thanks you for your answer.

So if I have understand, I need to make 42 foot radius for top bracing, glue it and use a 28 foot radius dish to sand the kerfling ?

Can you tell me wich braces are radiused on top (only the X braces and the brace up the soundhole ?)

Thanks you again all :)

Author:  ChuckH [ Tue Nov 16, 2010 2:23 am ]
Post subject:  Re: TOP and BACK radius for Martin 000-28 ?

bluescreek wrote:
Technically the top has a 1 1/2 degree worked into it. The top of the sound hole to the neck block . The backs are 20 on the dred and 15 on the 000's on down. We use a 28 foot disk as this will equate a 1 1/2 degree angle . The actual martin top bracing is 42 foot radius.


Don't feel bad Alexandre, I ain't tracking either.

John, you saying from the top of the sound hole to the neck block is 28' radius and from the top of the sound hole down it is a 42' radius? So, in effect, the top has two radius's on it?

Hutch

Author:  Darryl Young [ Tue Nov 16, 2010 6:39 pm ]
Post subject:  Re: TOP and BACK radius for Martin 000-28 ?

Chuck, not to speak for John.........but I think he is saying the top has no radius from the top of the sound hole to the neck block. And I think he is saying he uses a 28ft radius on his tops (John's personal builds) but that Martin gives their braces a 42' radius before glueing to the soundboard. At least that's how I interpreted it.

Author:  parrotheadmj [ Wed Nov 17, 2010 7:06 pm ]
Post subject:  Re: TOP and BACK radius for Martin 000-28 ?

From my dealings with John, what Daryl is saying is exactly the way I understand it to be.

Marc

Author:  bluescreek [ Wed Nov 17, 2010 7:47 pm ]
Post subject:  Re: TOP and BACK radius for Martin 000-28 ?

What I am saying is that martin uses a radius of 42 foot on the top bracing. The sides have a 1 1/2 degree ground into the that relates from the upper soundhole to the neck block. There is a slight radius on a top after gluing and when the top is glued to the sides the 1 1/2 angle on the sides actually bends the top slightly to accommodate the neck angle.
You can make a jig to do this but I like the 28 foot radius on the top as I do it in the video. This creates the neck angle into the sides. I am not a fan of sanding the angle into the top as this thins the area where you need the material .
In reality there is a flat spot on the upper bout 1 1/2 degrees and a slight radius on the rest of the top. In reality one you glue up the braces , they are subject to relative humidity and the torque of the bridge .

Author:  rdpdo [ Thu Nov 18, 2010 3:19 am ]
Post subject:  Re: TOP and BACK radius for Martin 000-28 ?

Thanks you very much, It is very clear now...

What about the top braces, Martin make the 42' radius on all braces (X and horizontal) ?

Thanks.

Author:  bluescreek [ Thu Nov 18, 2010 8:31 am ]
Post subject:  Re: TOP and BACK radius for Martin 000-28 ?

the only braces that are radiused on a Martin are the top X
the backs may be 15 to 20 depending on what they are for

Author:  CharlieT [ Thu Nov 18, 2010 6:50 pm ]
Post subject:  Re: TOP and BACK radius for Martin 000-28 ?

bluescreek wrote:
the only braces that are radiused on a Martin are the top X
the backs may be 15 to 20 depending on what they are for


John - if I understand correctly, the only top braces on a Martin guitar that are radiused are the x braces; the tone bars and finger braces are not radiused. Is that correct?

Author:  bluescreek [ Fri Nov 19, 2010 10:13 am ]
Post subject:  Re: TOP and BACK radius for Martin 000-28 ?

that is correct.

Page 1 of 1 All times are UTC - 5 hours
Powered by phpBB® Forum Software © phpBB Group
http://www.phpbb.com/