Replies to This Discussion

Permalink Reply by Tom T on June 7, 2019 at 7:31am

A three-on-a-strap tuner for an acoustic guitar has post spacing of around 35 mm ( 1 3/8"). Classic guitar tuners have post spacing of 39mm ( 1 17/32).

For what you are trying to accomplish I wouildn't worry too much about tuner spacing (withing in reason of course). Just remember, if you want the strings to run straight it is not the center of the post that has to be in the line you want but the edge of the post (usually the inside edge based on normal string winding conventions).

Good luck with your build.

• ▶ Reply

Permalink Reply by Mark Bliss on June 8, 2019 at 3:41am

Distance from post to nut can complicate the issue of getting a proper break over the nut.

I discovered this the hard way on an early build by miscalculating the height of the post relative to the nut combined with having the post distance a little too close to the nut. 

I made it work by carefully wrapping the string down the post and allowing a few extra turns from what I would normally do. But it was close.

I'd suggest careful planning of the height, combined with a little more distance than you might expect to need, which should minimize the chance of this being an issue. 

Other than that, sounds like your on the right track. I appreciate a straight pull design, and prefer a design with no "trees" or gizmos.

• ▶ Reply

Permalink Reply by Timothy Hunter on June 9, 2019 at 1:55am

only real consideration is if the angle is too steep you can break strings. too shallow and you might have tuning stability issues.

• ▶ Reply

Permalink Reply by Jerry Jordan on June 11, 2019 at 9:19am

A fellow builder told me he had asked me the same question and I replied 7/8".,.,I have no recollection of ever saying anything of the sort.,.,.so i say "eyeball it".,.,

• ▶ Reply

Permalink Reply by Tim Hooper on July 6, 2019 at 1:54am

I'm with you on the straight string ethic, so I've adopted a tapered headstock shape as a kind of signature.

Given a head back-angle of between 10 and 15 degrees, I reckon on a minimum of 40mm (say 1.5") between the nut and nearest tuners.  Any less than that, and there might not be enough of a break angle as the strings pass over the nut.

The height of the tuner posts can vary with their manufacturer, and can be a factor here.

On an earlier build, I didn't have enough of a break angle, and had to fit a guide bar over the strings (behind the nut) to force them down a tad.

Tim

• ▶ Reply