If the action on a guitar is very high, you will find it tough to play the guitar. This means that the measurement from the strings to the straitboard is more. It is a three-step process in the lowering action on the acoustic guitar. The three steps are straightening the neck, lowering the nut along with putting up the saddle.
1) Straightening the neck:
Examining whether the adjustment of the truss rod may be required for lowering the action, first should clearly notice the neck of the guitar whether the neck of the guitar is bowed towards up or down.
If the neck of the guitar is bowed towards up, it will be slightly bent up whereas the guitar which is bowed downwards will have a bend towards down.
Inside the neck of the guitar, you will be able to find a thin and a steel rod which is called a truss rod. Depending on the design of the guitar, you will be able to see when the nut is getting adjusted from the peghead or else near the soundhole.
If the truss rod will only be found near the soundhole, all you want to do is that you have loosened the strings present before you start adjusting the truss rod is nothing but the belt.
The accessing of a tool in the soundhole much easier because of this. But ensure that none of the strings are removed completely. With the help of a nut driver slowly turn the head of the screw or nut present in the truss rod.
There might be a necessity where you should smoothen a truss rod nut in the case where you own an old guitar or also in the case where the truss rod has not been turned ever.
After doing all you should retune the guitar and you should check for the measurement from the strings to the straits.
So, that you can check whether the issue is resolved or not. Damage can be caused to the guitar if you screw it even after completing one full rotation.
2) Lowering the nut
You can do the lowering action on the acoustic guitar by notches being filed on the nut. These files are in correspondence to the string’s gauge are required.
A pack of six of such nut files are required since the thickness of each string varies from one another. Before making adjustments on the nut you should make sure that all the strings are tuned.
The gauge should be placed atop the first strait so that a calculation can be made how much nuts should be required to lower the action of the guitar depending on that. You can loosen string after doing all the adjustments.
3) Setting up the saddle:
The saddle is nothing but a long, thin nut which is usually made up of bone or of synthetic material. The measurement between the 6th string and the 12th strait should be measured.
The saddle is held in place only because of the tension caused by the strings. You can use a string winder to detune the guitar.
Once the lowest three strings are being removed from the guitar, you can also remove the saddle from the bridge. After the saddle being sanded, you can place the sanded saddle back into the bridge by slowly lifting up the strings.