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mjamesf

Guitar-lele

by mjamesf Nov 9, 2013
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I tried to print a 19" scale length Mini LP guitar. Even with 3 carbon fiber rods in the neck it bowed. Wouldn't stay in tune etc.

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You're running into a scale length issue like Kentronix mentioned. Just making an assumption, you're using the typical Fender scale, which is 25.5" (~the 65cm you measured). Its about ratios really. Lets say you have 13" of string to vibrate instead of 25.5". You can tune your open string to the proper note, but as soon as you try and play a note with any of your fingers on those frets, the scale of your scale is off, and your intonation is off. The first fret distance you should have (distance from first fret to the nut) is .73", but if you copied without scaling off of a tele or strat you should have it nearly double, at 1.431". So if you're pushing down on the first fret of your E string, you should be playing an something like an F# instead of an F. Remember the 13" is completely arbitrary, I haven't measured your actual scale length. More info on StewMac:
http://www.stewmac.com/How-To/Online_Resources/Fretting/Scale_Length_Explained.html
http://www.stewmac.com/FretCalculator

Thanks for the detailed explanation. I actually have the complete set of frets modeled, I just haven't printed it. If anyone wants to print the whole set just download the sketchup file it under thing files.

Awesome job.
The next neck you print, try and leave a hollow column through it to put a thread rod into to counteract the bend by the strings.

For the frets to work correctly the string length from nut to bridge needs to match that of the guitar you copied it from. I would love to have a go at printing this,do you happen to have the guitar that the fretboard was measured from available to measure ? I am sure it can be calculated instead but copying is always easier :)

It doesnt actually need extra frets, but it does need the string length that they would have taken up, either that or scale the existing frets. ie,if the length of the string is 75% of that previously, then scale each fret to 75%. I am not 100% but I think that is how it works. By making it nly 9 frets you cant actually make the guitar any shorter.

Thanks for clarifying that. I copied the whole neck and frets from my electric guitar. I meaured the total length of the string and it's 650mm (65cm) from nut to bridge.

No problem, so you need to extend the body of this model so that the bridge is 65cm from the nut. Or , alternatively you can divide the length of this models strings (in cm) by 65cm, then scale each of this models frets down to fit within the shorter string.

Unfortunately to make a shorter length guitar you have to scale down the frets, you can't just get away with doing away with the bit of string length you dont need. Shame, I would love a short portable guitar for my travels :)

if i pay you how much do you want for the guitar with the base and shipping included

i think you should cover the bottom cause in the end of the vid there is no bottom

Yes I haven't modeled the bottom cover. I'll try to upload if I had the time to model one. It still produce sounds when you strum but softer.

Anyone knows why it doesn't sound right when you play a chord on this 9-fret guitar? Does it need to be built
with a complete set of frets? I managed to tune it correctly.

For those who want a complete set of frets it's in the sketchup file I've uploaded.

Cool Thing! It might be a good idea to ajust the model so you can put something like a metal rod/T-profile in the neck, so it won't bend.

Yes that's what I thought too after building this.