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Permalink Reply by Scott McGilliard on October 4, 2016 at 7:34am

The rod piezzo needs direct pressure of the vibrating string to work - ie between the saddle and bridge,  with the saddle free to vibrate onto the rod.  That's what I've been able to find out.  I think that the rod might not be a sensitive as the disk?  I've had the same question, and maybe I'll get around to experimenting with one soon.

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Permalink Reply by lawntrout guitars on October 4, 2016 at 10:04am

thanks scott

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Permalink Reply by Ron "Oily" Sprague on October 4, 2016 at 7:37am

Rod piezos need direct downward pressure from the bridge. Try a littl experiment: make yourself a wooden bridge, and set it directly atop the rod piezo (you may need t carve a small channel into the base of the bridge for the rod to fit into). It will work.

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Permalink Reply by lawntrout guitars on October 4, 2016 at 10:05am

thanks ron

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Permalink Reply by JL on October 6, 2016 at 1:15am

What do you use to keep the bolt from rolling and messing up the intonation when tuning?

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Permalink Reply by lawntrout guitars on October 6, 2016 at 1:34am

Its a bolt and nut at the bridge. I have several sizes to get the action right. I also use a 3/8 x1-1/2  bolt as the nut set in a small indentation. The movement of these allows easy conversion from a low action to a higher action if one wants to play more slide guitar. Intonation doesn't seem to be a problem. Plus the thing looks really cool.

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Permalink Reply by JL on October 7, 2016 at 2:44am

ok, the hex head of the bolt and hex nut stop it from rolling.  I asked because I have stumbled across a few wall hangers that used a bit of threaded rod, and when I went to tune them I could watch the threaded rod roll toward the neck. 

Its become my new favorite curse word - "Wall Hanger!" LOL

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Permalink Reply by lawntrout guitars on October 6, 2016 at 1:58am

I guess that my option. I was hoping to just glue it to the inside :-(

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Permalink Reply by Ron "Oily" Sprague on October 6, 2016 at 3:34am

You keep doing that, you'll keep buying disc piezos. The way to make it work with a bolt is to

1) cut the bolt head off
2) Grind a flat into one side of the bolt
3) Carve a channel just barely big enough lengthwise into the flat so that the rid piezo fits inside it.

That's a lotta grinding and cutting.

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Permalink Reply by JL on October 7, 2016 at 2:47am

A rod has maybe 30-50 square millimeters of piezo on it, a disk has somewhere around 2000 square millimeters of piezo.

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Permalink Reply by Rich on October 6, 2016 at 8:46am

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Permalink Reply by John Sawyer on October 7, 2016 at 8:01am

That is how I did mine... first one was awesome. The second I decided to cut the piezo shorter... fail... next time I leave it long, up the one was awesome...

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