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Density Calculator
http://www.luthiersforum.com/forum/viewtopic.php?f=10101&t=25021		 Page 1 of 1
Author:  schrammguitars [ Sun Dec 13, 2009 11:24 am ]
Post subject:  Density Calculator
Just found this cool density calculator
http://www.indoorduration.com/BalsaCalc2.asp
Author:  Pat Foster [ Sun Dec 13, 2009 12:19 pm ]
Post subject:  Re: Density Calculator
Nice little applet. It says for balsa, but it seems it shouldn't matter. I mean, density is just weight/volume, right?

Pat
Author:  Dave Stewart [ Sun Dec 13, 2009 1:22 pm ]
Post subject:  Re: Density Calculator
Right.
But, as I asked in another thread, what is "standard" convention for luthiers??
This takes gms & inches & calcs lb/cu.ft. I calculate gms/cc. Brock uses gms/cu.in. What's everybody typically use?
Author:  Fred Tellier [ Sun Dec 13, 2009 1:55 pm ]
Post subject:  Re: Density Calculator
That's my other hobby, indoor duration models, we use mixed measurements all the time as the weight of balsa spars and such has too many decimal places in ounces. When you build planes weighing in the range of 1 gram or less total weight the decimals become a pain. We are even more nuts than left brain guitar builders as all the parts are flex tested and weighed so to keep the completed plane weight as low as possible with acceptable strength.

Fred
Author:  JohnAbercrombie [ Sun Dec 13, 2009 2:16 pm ]
Post subject:  Re: Density Calculator
Dave Stewart wrote:
Right.
But, as I asked in another thread, what is "standard" convention for luthiers??
This takes gms & inches & calcs lb/cu.ft. I calculate gms/cc. Brock uses gms/cu.in. What's everybody typically use?


Standards? [uncle]

My inclination is always to use g/cm^3 like you, since it neatly matches with specific gravity (S.G.).
I notice that Alan Carruth uses kg/m^3 which is another 'standard' density unit that gets rid of the decimals for our uses.

Then of course there's the mm vs fractional inches vs decimal inches thing......not to mention left handed and right-handed tape measures....

Cheers
John
Author:  David Malicky [ Sun Dec 13, 2009 3:12 pm ]
Post subject:  Re: Density Calculator
JohnAbercrombie wrote:
My inclination is always to use g/cm^3 like you, since it neatly matches with specific gravity (S.G.).

I'm not sure of a lutherie standard, but I like that reasoning, too. pcf seems to be the standard in US forestry/lumber, so that can be helpful to follow. But g/in^3 is convenient for luthiers in the US.

Fred, Wow -- an airplane less than 1 gram.
Author:  sanaka [ Mon Dec 14, 2009 6:00 pm ]
Post subject:  Re: Density Calculator
Dave Stewart wrote:
Right.
But, as I asked in another thread, what is "standard" convention for luthiers??
This takes gms & inches & calcs lb/cu.ft. I calculate gms/cc. Brock uses gms/cu.in. What's everybody typically use?


When building with Gopherwood, I like to use shekels/per cu. cubit :lol:

Peace,
Sanaka
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