truss rod arched channel

[theodoropoulos]

I use in my projects dual truss rod which onlly needs a straight channel.But i have seen in fender the channel is not straigh but arched...I have not seen anyone here who uses one way truss rod ,making this arched channel..My question is if i have seen well and if yes what is the difference in operation between fender and les paul one way truss rods...

 

[David Collins]

A channel for a conventional compression rod does not need to be arched to function properly, but simply needs to be positioned toward the back side of the neck. Of course if you need to either insert or adjust the rod from the headstock, they often have to be arched to bring access to the slot further up where it reaches the headstock. The curve itself however, is not a necessary design element for it to function properly.

 

[theodoropoulos]

A channel for a conventional compression rod does not need to be arched to function properly, but simply needs to be positioned toward the back side of the neck. Of course if you need to either insert or adjust the rod from the headstock, they often have to be arched to bring access to the slot further up where it reaches the headstock. The curve itself however, is not a necessary design element for it to function properly.

forgive me for my ignorance,but i have never worked with one way...Do you mean that the truss rods used in Fender and in Les Paul are the same but with difference in positioning???

 

[David Collins]

The work on the same principle - pulling on the back side of the neck to counter string tension pulling above the front side. The further toward the back of the neck the rod is positioned, the more active and effective it will be. Their shapes and positioning may vary slightly, but these are minor differences done mainly to accommodate the access points of the rod.

The curve is often credited as a primary design element to how a truss rod functions - a rod with a curve will try to straighten when pulled under tension, therefore forcing the neck backward. This does contribute a small amount to how a rod may function, but it is quite minor relative to the rod's overall position within the neck.

If installation and truss rod access will allow (such as with a heel-side adjustment nut, and installation of the rod from the top) then a straight channel positioned close to the back of the neck will work just fine. If you want a headstock adjustment nut, or have to slide the rod or anchors in from the headstock end, then you may need a curved slot to bring the end up toward the surface of the headstock while keeping the majority of the rod toward the back side in the center.

Much of the reason for curved slots is more a matter of practical design than it is an influence on how the truss rod actually works.

 

[theodoropoulos]

ok my friend,you were 100% clear. I got it.
thank you for your interest in explaining me this.

 

[MRJ5]

Just in case you are interested, there was a thread a while back dealing with using a curved truss rod channel.

http://www.mylespaul.com/forums/luthiers-corner/27470-my-curved-truss-rod-channel-jig.html

Here is another as well.

http://www.mylespaul.com/forums/luthiers-corner/19329-truss-rod-channel-curve.html

 

[lexluthier72]

http://www.mylespaul.com/forums/luthiers-corner/122347-curved-truss-rod-slot-depth.html