Double Bass Single Piece Laser Cut 4mm Steel EUB and its Fingerboard will be bent at press vertically 3 times, for which bent angle ?

M

Mustafa Umut Sa

Oct 20, 2007
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istanbul
#1
I will order a laser cut , 1/6 inches thick, low carbon steel, electric upright bass.
It will be single monocoque piece.
I want to make a industrial press bent fingerboard and lower body , 3 TIMES with a constant angle like mimicking real EUB fingerboard curve cutaway.
3 bent makes 4 strings fingerboard cutaway
What should be the bending angle will be repeated 3 times ?

Umut
P1020815.JPG

Istanbul
 
#2
I think nut width is 2 inches fingerboard end is 9cms.

Given dimensions:
  • Nut width: 2 inches (5.08 cm)
  • Fingerboard end width: 9 cm (approximately 3.54 inches)
  • We'll still aim for a total curve depth of about 1/4 inch (6.35 mm) from the outer edges to the center
  • Number of bends: 3
  1. Calculating the angle:First, we need to determine the average width:Average width = (Nut width + Fingerboard end width) / 2Average width = (2 inches + 3.54 inches) / 2 = 2.77 inches (7.04 cm)Now, let's calculate the angle:Angle per bend = arctan((Curve depth / 2) / (Average width / 3))Angle per bend = arctan((0.25 / 2) / (2.77 / 3))Angle per bend ≈ 3.09 degrees
IS THIS CLAUDE AI CALCULATION TRUE ? 3.1 DEGREES BENT ANGLE IT SAYS.
It means 176.9 degrees , isnt it ? OR 180-3.1-3.1 :173.8 degrees ?
 
Last edited:
#5
FRIENDS , ARTIFICIAL INTELLIGENCE IS IDIOT. I ASKED THE SAME QUESTION THREE TIMES AND IT GIVES SO DIFFERENT ANGLES. Can you help me ? I will use 42mm nut , 94 mm board end width and 70 cms fingerboard lenght and 106cm string lenght.
 
#7
The string-to-string angle at the bridge is determined from the fingerboard curvature, which is set based on the player's preferences, particularly around bowing. More curvature allows for freer bowing but requires more arm movement in moving from string to string. Because this sort of setup choice is within a continuum of options to suit the player, there are no set-and-forget rules, and I expect that's why you're having difficulty finding a reference. Doing what you have in mind will require that the player adapt their style to the instrument rather than vice versa.

That said, a manufacturer has to start somewhere, bearing in mind that the buyer will employ a local professional luthier for their own setup. The Music Educators National Conference (now National Association for Music Education) published this guide to manufacturers building instruments for students in 1988. It may give you an idea of median figures.

MENC string height page.jpg
 
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#8
Steven Ayres said:
The string-to-string angle at the bridge is determined from the fingerboard curvature, which is set based on the player's preferences, particularly around bowing. More curvature allows for freer bowing but requires more arm movement in moving from string to string. Because this sort of setup choice is within a continuum of options to suit the player, there are no set-and-forget rules, and I expect that's why you're having difficulty finding a reference. Doing what you have in mind will require that the player adapt their style to the instrument rather than vice versa.
Click to expand...

Dear Steven , Thank you very much. As I digest from your added drawing , I understand , there is no need of 3 different press bents longevitely. I think single , middle bent and dividing 2+2 strings as 2 group is a better idea. I have small to mid size hand which is very weak and my last shortest finger is very short and very very weak. I never used my hands in any physical job and I am 53 years old and I only went to double bass course for a month , it was very expensive and now price is unreachable. I was very successful to put my hand at nut position with all fingers opened and loved the feel and sound of thomastik flexicore - or spirocore - strings very much. When I was a kid , my friend had a sweden bass with a old tube television sized headstock and I want to own and play a bass for 37 years. What kind of fingerboard end middle height do you advise ? And fingerboard lenght , nut and fingerboard end widths ? Thank you very much indeed.
 
#9
Mustafa Umut Sa said:
Dear Steven , Thank you very much. As I digest from your added drawing , I understand , there is no need of 3 different press bents longevitely. I think single , middle bent and dividing 2+2 strings as 2 group is a better idea. I have small to mid size hand which is very weak and my last shortest finger is very short and very very weak. I never used my hands in any physical job and I am 53 years old and I only went to double bass course for a month , it was very expensive and now price is unreachable. I was very successful to put my hand at nut position with all fingers opened and loved the feel and sound of thomastik flexicore - or spirocore - strings very much. When I was a kid , my friend had a sweden bass with a old tube television sized headstock and I want to own and play a bass for 37 years. What kind of fingerboard end middle height do you advise ? And fingerboard lenght , nut and fingerboard end widths ? Thank you very much indeed.
Click to expand...
I literally can't give useful setup advice remotely. You're building this thing for yourself and unless you bring in a local professional only you can set it up for you. There's a lot to know, some of it can seem counterintuitive, and pros study this stuff for years. Books can help, and I'd recommend you read all you can on the subject and absorb it before you attack the problem. Talkbass can help, there is a great wealth of good information buried in these threads, and people who can provide great suggestions. But no one can tell you specifically how to do it for you, particularly because your design is far outside normal practice. Yours will be a largely trial-and-error process, so plan for failures before you succeed.
 
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