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#1
10-31-2012, 01:41 PM
 Registered User Join Date: Feb 2010 Location: Triangle Area, NC
visual representation of different scale lengths

For those interested,

I just created a visual representation of the difference between a 41" and 41.75" scale length.

http://i.imgur.com/s8Ow1.jpg?1

As you can see by the the small differences between the fingered F on the E string, the individual difference between each position is negligible. It will be less for each note as you ascend the fingerboard.
#2
10-31-2012, 01:52 PM
 Oracle, Ancient Order of Rass Hattur; Mem. #1, EPC Join Date: Apr 2004 Location: Connecticut
Excellent, now please calculate how many cents out-of-tune one would be by substituting one fingered position for the other. Or not...
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#3
10-31-2012, 02:05 PM
 Registered User Join Date: Feb 2010 Location: Triangle Area, NC
Quote:
 Originally Posted by drurb Excellent, now please calculate how many cents out-of-tune one would be by substituting one fingered position for the other. Or not...
Ha! Photoshop won't do that for me!

I figure the difference in distance to be about 0.056".

You're welcome to jump on that math if you wanna!
#4
10-31-2012, 02:16 PM
 Registered User Owner/The Bass Spa, String Repairman/L & M Vancouver Join Date: May 2006 Location: Crescent Beach, BC
20.875/12 = 1.73958
20.5/12 = 1.708333
1.73958 - 1.708333 = .0312466 almost exactly 1/32"
#5
10-31-2012, 02:23 PM
 Registered User Join Date: Feb 2010 Location: Triangle Area, NC
Quote:
 Originally Posted by Jake deVilliers 20.875/12 = 1.73958 20.5/12 = 1.708333 1.73958 - 1.708333 = .0312466 almost exactly 1/32"
That's the average difference each note would be, right?

I'm interested in the E to F because that would be larger.
#6
10-31-2012, 03:22 PM
 Registered User Join Date: Feb 2010 Location: Germany, Nordrhein-Westfalen
Fingered string length of a (tempered) halftone above the open string:

fingered_string_length_a_tempered_halftone_above_t he_open_string = open_string_length / 12th_root_of(2)

Calculate this for 41.5 and 41.75 inches, subtract one result of the other and you have the difference.

If you want just intonation there are several ratios, depending on function of the interval:

fingered_string_length_a_tempered_halftone_above_t he_open_string = open_string_length * 15/16 (lead tone to root, in C major: B to C in G to C triads)
fingered_string_length_a_tempered_halftone_above_t he_open_string = open_string_length * 24/25 (root to raised root, in C major: C to C# in C to A triads)
fingered_string_length_a_tempered_halftone_above_t he_open_string = open_string_length * 128/135 (minor seventh to major seventh, in C major: Bb to B in C7 to Cmaj7)
(there are probably some more ratios, but the last is complicated enough, I think)

Last edited by DoubleMIDI : 10-31-2012 at 03:50 PM.
#7
10-31-2012, 03:54 PM
 Registered User Join Date: May 2009
Open E to F on a 41 inch scale = @ 2.30 inches
Open E to F on a 41 3/4 inch scale = @ 2.34 inches, or a little more than 1/32.

That isn't a lot, but I went through the same issue with my left hand having a too short pinky, and trying to figure out exactly my largest stretch from E string 1/2 F to D string 1st position 2nd finger F. I then extrapolated the largest scale I can accommodate, and false nutted my CCB down accordingly.

If a person does shorten the scale, and doesn't want to reset the neck or splice the neck down, then one has to be careful with a false nut so that the string still lays in the groove and is secure coming over the nut witness point, and the string path is smooth so tuning is smooth and there is no risk of the string grabbing or kinking. Shortening can also affect intonation of D or Eb at the heel. On my CCB, it helped better establish the neck as a D neck instead of "in between" as it was before.
#8
10-31-2012, 06:42 PM
 Oracle, Ancient Order of Rass Hattur; Mem. #1, EPC Join Date: Apr 2004 Location: Connecticut
...can't believe you guys took the bait.
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#9
11-26-2012, 10:45 AM
 Registered User Join Date: Aug 2012
What is the usual length of a 7/8 or 4/4 bass? My largish 7/8 bass feels noticeably different from the 3/4 bass I had.
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#10
11-27-2012, 10:55 AM
 Registered User Join Date: Jan 2007 Location: Winnipeg, MB
There was a chart posted in here somewhere - thought I'd seen one anyway...
My 4/4 Strunal has a playable string length of 44.5". I'd think you'd need at least 43" to be able to claim 4/4. Not that it's anything to aspire to....playing on 44.5 gets old fast some days...
#11
11-27-2012, 12:17 PM
 Registered User Join Date: Dec 1999 Location: Princeton Junction, NJ
Is there a point to this thread?
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#12
11-27-2012, 01:11 PM
 鉄人マイケル Join Date: Jun 2006 Location: Eugene, Oregon
Suffice it to say that the definition of a minor second is two bassists playing in unison.
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