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Thickness Sanding
http://www.luthiersforum.com/forum/viewtopic.php?f=10101&t=40166		 Page 1 of 1
Author:  Goodin [ Wed Apr 24, 2013 9:56 am ]
Post subject:  Thickness Sanding
Just curious how much do you guys allow for final sanding when you thickness sand your tops/sides/backs?
Author:  Pmaj7 [ Wed Apr 24, 2013 10:45 am ]
Post subject:  Re: Thickness Sanding
I don't know you, and this is crazy, but heres my number; Sand .005-.010 maybe?

But seriously, it's not something I think about because my target thickness always accounts for (hopefully) the same amount of final sanding.
Author:  Michael.N. [ Wed Apr 24, 2013 11:12 am ]
Post subject:  Re: Thickness Sanding
What happens when sanding something like figured Maple? I've read (from a highly respected figure) that some of the grit can embed into the flame.
Author:  SteveSmith [ Wed Apr 24, 2013 12:38 pm ]
Post subject:  Re: Thickness Sanding
Maybe not the best process but here's what I do. I sand till my deflection test jig gives me the right answer, for example, 0.25" deflection over 18" with 5 lb bar in the middle of a joined D-size back. It will get a bit thinner when I clean up the rosette but I try to take of minimal additional material.

Guess that didn't really answer the question but for backs and sides I shoot for no more than .010" over.
Author:  Marcus [ Wed Apr 24, 2013 12:42 pm ]
Post subject:  Re: Thickness Sanding
usually about 0.010".
Author:  Goodin [ Wed Apr 24, 2013 1:19 pm ]
Post subject:  Re: Thickness Sanding
Hey Steve - How do you know what is the "right answer"? This is getting into the Gore/Gillet science stuff. I have the books..need to read over this part (I typically gloss over all the equations, takes the fun out of building for me).
Author:  SteveSmith [ Wed Apr 24, 2013 3:18 pm ]
Post subject:  Re: Thickness Sanding
Goodin wrote:
Hey Steve - How do you know what is the "right answer"? This is getting into the Gore/Gillet science stuff. I have the books..need to read over this part (I typically gloss over all the equations, takes the fun out of building for me).


Hi Gil, I have no idea if I have the right answer but here's the path I've traveled to get get where I am. I started by trying to do Chladni testing after reading several years worth of Al Carruth's excellent posts. Unfortunately I didn't have a lot of success so I decided to try deflection testing after reading a really detailed thread on the subject either here or at the MIMF. I worked my way through David Hurd's "Left Brain Lutherie" book, spoke with him several times and also corresponded for a while. I based my original starting numbers on deflection test calculations I did based on David's book and, to be honest, on the numbers that were published by a luthier (I don't remember who) whom I felt really had his act together.
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