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Post by ericmd on Jul 31, 2008 8:05:20 GMT
The Harmonic method for positioning is canny but for one or two things. Where should I touch the string to get the harmonic? |
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Post by Danny on Jul 31, 2008 12:27:06 GMT
to get the harmonic you place your finger very gently, directly over the fret wire
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Post by ericmd on Jul 31, 2008 12:36:36 GMT
gRAND.Always the perfectionist!
Should my bridge look slanted?
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Post by Danny on Jul 31, 2008 17:28:05 GMT
possibly a bit, but not too far. IF it's slanted, the bass side will be further away from the neck than the trebble side. Check the harmonic of the 12th fret verses the note of the 12th fret with an electronic tuner. The forumula for correcting it is this 'Fret Flat Forward' meaning if the fretted note is flat compared to the harmonic, move the bridge forward (towards the neck)
On a banjo it's only really worth doing this at the 1st and 4th strings as the 2nd3rd and 5th (if you have one) are gonna follow in line anyway, the 1st and the 4th gives you the best compromise.
Any troubles send me a PM or just post here mate
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bondolah
Full Member
frails like a dawg
Posts: 118
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Post by bondolah on Oct 8, 2008 19:39:57 GMT
Isn't there a measurement formula for positioning the bridge somewhere?
I'll be honest I just marked a big X (in fat permanent marker, obviously) where AndyBanjo told me the bridge should go.
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Post by Fingers n thumbs on Oct 9, 2008 7:37:23 GMT
There are a few scale length measuring software tools out there - i think the stewmac.com site has one. Essentially your banjo will have been built with a set scale length of around 26.5" , banjos tend to adopt a standard size. If you have a 26.5" scale length neck then the bridge should be 26.5" from the nut, easy peasy.
Then you play around with it a little to adjust the intonation as above - and then yeah i'd mark it on the head too.
You can also get a 'compensated bridge' that has steps in so you don't need to slant the bridge to get an overall best fit.
Learnt alot when i built my box banjo ;D
Rog
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mark
Full Member
Posts: 133
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Post by mark on Oct 18, 2008 0:13:18 GMT
I tend not to mark the head anymore.
It doesn't take long to find the right spot and adjust for intonation after you have done it a few times.
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Post by pays0n on Oct 18, 2008 17:34:26 GMT
Hey Bondolah,
I think you can find the scale length of any instrument with frets by measuring the string from the end where it leaves the nut to the middle of the 12th fret and doubling it. If you take the measurment from the nut to the 12th and measure the same distance from the 12th fret to the banjo head that is where the bridge should go. You will have to make minor adjustments forward or back using a tuner and checking that the open string and the freted note at the twelfth fret are the same. Or you can check the harmonicsbut I am not sure where exactly.
-Pays0n
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Post by pays0n on Oct 18, 2008 17:36:29 GMT
P.S. i'm an ejit as I didn't fully read the how to tune by harmonics post above before I wrote!
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Post by Danny on Oct 18, 2008 18:03:14 GMT
P.S. i'm an ejit as I didn't fully read the how to tune by harmonics post above before I wrote! Provided it get's done, that's what matters Danny |
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