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PARTS
Truss Rod
I don't know what it is about
a truss rod that can make grown men cower like little boys at the thought of
having to make an adjustment. This should help break your fear and allow you to
wear pants again proudly. Much of this fear comes from techs that will tell you
"you can ruin your neck if you mess with the truss rod!", which, is a really
good way to scare you into relying on the tech to do all your light work for
you. Can you ruin a neck adjusting the truss rod? Sure, if you're an IDIOT! So,
if you're an idiot and can't follow simple instructions, STOP HERE, and keep
paying that local tech whatever he wants to keep your guitar adjusted. Just make
sure he ties your shoelaces before you leave so you don't trip and fall and skin
your knees since you probably forgot to put your pants on. The rest of you
please read on, this is simple stuff, the only requirement is the ability to
turn a wrench and the slightest bit of common sense. Overwritten by a blow hard
as usual.
Please read to
the end and the DISCLAIMER before beginning or making any adjustments, and I
cannot stress how important it is to use the correct tool, a good tool, and to
have that tool *fully* seated either around the full length of the nut or full
depth of the channel. The easiest way to strip these parts is to use a poor
fitting tool, or only partially insert the tool on the nut or head to be
adjusted.
There are a few types of truss
rods, but essentially the
truss rod consists of a nut on a threaded shaft [rod] that is pinned in the neck
at the other end. It is there to counteract the pressure the strings exert
pulling on the neck, by pulling the wood in the opposite direction. This allows
you to control the amount of relief you desire in the neck.
Relief is the amount of bow
the neck has. Relief allows for the the following fret to be a hair lower than
the previous fret so that the previous fretted note has a little extra clearance
when played, thus reducing the buzz of the string pinging off the following
frets. The amount of relief is a personal issue and some people actually prefer
a dead straight neck, while others will prefer ample relief. The lower the
action is set the less relief the setup will allow, the higher the action is set
the more relief a setup will allow, but the higher the action the less relief is
needed for fret clearance as the high action reduces the buzz on it's own. If
you fret the first and last fret on the wound E string you will be able to see
how much relief the neck has by checking the clearance from the top of a fret [I
use the 9th as it's pretty much dead center of the neck] to the bottom of the
string. The measurement of this gap is the relief, ie. .3mm of relief at the 9th
would be .3mm of clearance between the top of the 9th fret and the bottom of the
E string. I've written basic guidelines for what is fairly normal for relief in
any give setup on my
Action page, but you and you alone will determine what is best for your and
the way you play, and the only way to know that is simply, experiment. Straight
neck, lots of relief, feel the difference as the string clearance grows through
the center of the neck and hear the difference. Adding relief will add action
height so you will have to readjust the action to compensate, just the same as
straightening a neck will reduce the action height and you will have to raise
the action to compensate. Experimenting with all combinations of relief and
action will allow you to find the setup that works right for you, and to
mentally note what it is, allowing you to keep that setup as you prefer it.
A neck will continue to adjust after the adjustment has been made, for up to
24 hours. Wood can react to stress slowly or quickly, so you should be aware
that a second relief check should be made several to many hours later. Slight
relief changes should not show later change but large relief changes like the
experiments I'm going to have you do next quite possibly will. As long as you're
aware, you're educated and the adjustment is, again, simple.
Pictures - eh, coming. Just to illustrate the different Ibanez truss rods and
tools. 7mm [RG/JEM] and 8mm [RBM/AR] typical nut on threaded shaft, but they
also use an Allen wrench adjusted Allen head shaft that threads into a fixed nut
on the other end. These will be either 4mm [JS1] or 5mm [JS1000]. They all
adjust the same, the only difference is the tool.
No 2 necks will adjust the same [not true considering there's probably a
billion necks out there, but for the purpose of this page lets consider that a
truth]. Some necks will adjust a lot to just a small tweak of the truss rod
while some will require much more to get the same result. Until you know which
you have it's always best to make smaller adjustments. I firmly believe that
everybody should get their truss rod wrench out, pull the truss cover off if it
has one, and adjust away just to observe the principle discussed here. Start by
checking the relief that is in the neck, and then completely loosen [looking at
the nut from the tip of the headstock back toward the body - lefty loosey] the
truss rod until it's loose. Check the relief again [I would tell you to "sight
the neck" also as another way to observe, but that's another page of typing] and
you will see how much it moved [bowed]. Note this. Some necks will be in HUGE
relief when loose, some will give barely any relief at all which will limit your
setup options. Unfortunately there are also just bad necks that will be in
backbow with a loose truss rod that will need to have professional attention to
train into relief. What does your neck have? The gauge strings you have on
your guitar will also affect the amount of relief as heavier gauges exert much
more tension on the neck pulling it further into relief. With the truss nut [or
rod] loose I usually recommend continuing until it's far enough out to get some
grease under the nut so that it will operate smoothly. This can be done at any
time and need not interfere with experimenting with the truss rod now.
Let go the other way. As you
tighten the nut [looking at the nut from the tip of the headstock
back toward the body - righty
tighty] it removes the relief in the neck, straightening the neck, and
eventually putting the neck into negative relief or backbow. This is where you
can really check how much of a turn makes how much difference. Because of the
nature of the truss channel and the way the strings are on either side [and on a
7 string you have a string running right in the middle of the truss channel] the
amount you can turn the nut is limited to somewhere between 1/8 - 1/4 of a
turn, and until you get the hang of how much it changes the neck relief this is
about all you want to turn it anyway. Adjust, then check the relief to observe
what happened, then play it and see how it feels, at the nut, the lower
registers, the middle registers, etc. Repeat and continue adjusting and testing.
I want you to take the neck into backbow so you can see for yourself, the sky
didn't fall, the neck didn't break, it can be corrected just as easy as, turning
a wrench. Once it's in backbow there is no need to tighten further, a guitar in
backbow is a guitar that needs a truss rod adjustment. Go ahead and play it,
especially fretting the first fret to observe the buzzing, if it allows first
fret notes and not second or third to ring out. This is only so that you can see
and become familiar with making this adjustment and getting over any fear of it.
Now that you've adjusted the truss rod in both directions you can adjust it
back to the starting point or wherever you found that you liked it set through
experimentation. That the whole point of this is to not only get over any
apprehension and fear of the truss rod itself, but to find that setup that you
like the best. On most necks a very small 1/16th turn adjustment can make the
difference of .1mm in neck relief and eventually you will get to know your neck
and how much is enough. Remember that adjusting the truss rod also means
adjusting the action, which is why a lot of this is covered on the Action page
as these adjustments go hand in hand. Relief adjustments affect action height,
plain and simple.
Unfortunately I'm not going to cover neck profiles here and there are plenty
of guitars in all stages of "stored neck disease". This is usually caused [but not
always] by a guitar that is allowed to sit unadjusted for years. As the wood
continues to shrink it in effect loosens the truss rod. The wood takes this as
memory and will show relief in the middle of the neck that will not truss out,
in fact the guitar will start going into backbow at the nut before you'll get
the mid neck relief out. These guitars will want to stay in whatever the
smallest amount of relief is possible to live with the least amount of backbow
in the first few frets. There's also a condition called "scarf-joint-itis" where
the plane of the headstock piece scarfed into the neck is shrinking counter to
the plane of the solid neck, pulling the neck into backbow at the first or
first few frets. Another condition where the amount of backbow will control the
amount of relief or straightness possible. These are conditions of less than
desirable necks but often perfectly serviceable necks, they just won't be useful
to those that like very low action or very straight necks.
DISCLAIMER - if it is extremely difficult to turn your truss rod there might be
an existing issue with your neck. It could have been factory built with far too
much relief at rest, or it could have an unknown condition. I would recommend
fully loosening the truss nut as shown above, back the nut [or rod] far enough
out so that you can get some grease between the nut and the block, then see if
that has fixed the
problem. Dry contact between nut and block will also cause creaks when turning
making amateurs think there is something wrong. If it is still difficult to
tighten the truss rod after lubrication STOP, and let a professional or a friend
that is familiar with adjusting truss rods have a look at it for you. Is IS
possible to damage a neck adjusting the truss but it is usually in this
situation where there is already an issue. You can also damage a neck by
continuing to put a neck into more and more backbow until the stress cracks the
neck or damages the rod/nut, but, that would be idiotic, so lets just not go
there ;)
There are situations where you will want to relieve the
string tension before making adjustments. If there is any play between the nut
[or Allen] and tool from past adjustments made with the wrong [SAE] tool,
partially fitting the tool on the head, inferior parts, or inferior wrenches
with poor fit or wear, obviously any adjustment should be made with no/little
stress on the neck in hopes of preserving the fit and adjustability you have
left in the parts. I cannot stress enough to always use the correct tool, and a
quality tool to do the job.
If your neck is super stressed at rest, like you will find some BRMR necks [I've
seen 2mm at loose truss with no strings on banana necks] among others, as well
as guitars that have sat for years and are in extreme relief, there will
definitely be excess tension on the neck and truss and it would be prudent to
make the adjustment without tension on the neck, and in most cases, forcing the
neck into straight/backbow and adjusting the truss while it is loose. If ever in
doubt seek professional advice.
If your truss operates smoothly as it should and you're making minor
seasonal/climatic adjustments, there is no need to detune to make the
adjustment. If you feel strongly about doing so, there is no reason not to
follow your own path. Erring on the side of caution can never be a bad thing. If
it's a trem equipped guitar drop the bar to the body, it's the ultimate in
simplicity. If it's a fixed bridge just loosen the strings until the adjustment
is easily made.
Copyright 2000 Ibanez Rules!! All rights reserved.
Revised: January 15, 2024.