You built a guitar. With your own hands. It looks fantastic, the neck feels great, and you strum an open G chord like a champion. Then you play a chord up at the 12th fret and your guitar sounds like a cat being gently stepped on. Congratulations: you've discovered intonation, the thing nobody mentions when they hand you a DIY guitar kit and a congratulatory pat on the back.
The good news? It's a ten-minute fix with a tuner and a screwdriver. Let's talk shop.
So what is intonation, anyway?
Intonation is just a fancy word for "does your guitar stay in tune with itself as you move up the neck?" Tune your open string perfectly, then fret the 12th fret. That note should be exactly one octave higher. If it's sharp or flat, your intonation is off.
It happens because the string's vibrating length (the distance from the nut to the saddle) doesn't quite match what the math wants once you press the string down and stretch it a hair. Every time you build your own guitar, that distance needs a little fine-tuning. Factory guitars get a setup before they ship. Yours gets one from you. Lucky you.
What you'll need
- A decent clip-on or pedal tuner (your phone app works in a pinch, but be nice to yourself)
- A small screwdriver or hex key that fits your saddle screws
- Fresh strings, stretched in and holding tune
- A flat surface and a little patience
Do not try this with old, dead strings. Dull strings lie to your tuner, and then you'll lie to yourself. Put on a fresh set first, stretch them until they stop drifting, and set your action and neck relief before you touch the saddles.
How to set intonation, one string at a time
- Tune the open string to pitch. Be picky.
- Play the harmonic at the 12th fret by lightly touching the string above the fret wire and plucking. Note the tuner reading.
- Now fret the string at the 12th fret and pluck normally. Compare the two readings.
- If the fretted note is sharp, the string is too short. Move the saddle back, away from the neck, to lengthen it.
- If the fretted note is flat, the string is too long. Move the saddle forward, toward the neck.
- Retune the open string and repeat until the harmonic and fretted note match. Yes, you'll retune a lot. That's the job.
Work through all six strings. Heavier strings usually need more length than thinner ones, so expect your saddles to end up in a slightly staggered line. If your bridge looks a little crooked when you're done, that's not a mistake. That's a guitar that plays in tune.
Common intonation gotchas
A few things trip up first-time builders:
- Skipping the setup order. Changing your truss rod or string height after setting intonation means doing it all again. Neck relief and action first, intonation last.
- Switching string gauges. Heavier or lighter strings change the tension and the length they need. New gauge means a quick recheck.
- Fighting your tuner. Tune from below the note and settle into it. Don't chase it back and forth.
- Bridge placement. If a saddle runs out of travel and still won't intonate, the bridge may be sitting a bit off. Check your placement against the scale length before you panic.
Why it's worth doing yourself
Here's the part we love: learning to set your own intonation is one of the best perks of going the DIY route. You stop being someone who plays a guitar and become someone who actually understands one. Every guitar you touch after this gets a little easier to diagnose, and the next time a buddy complains that his guitar "just sounds off up high," you get to be the guy with the screwdriver.
Plus, a properly intonated guitar sounds better with every chord, every solo, and every awkward open mic night.
Ready to build something that sounds as good as it looks?
If you've been thinking about taking the leap, browse our electric guitar kit DIY options at Vibeworks Guitars. Whether you're a first-timer or a woodworker looking for an unfinished guitar kit to put your own stamp on, we've got a kit with your name on it. Grab one, get building, and bring a tuner.