CA glue to eliminate false beats from bridge pin, experiment
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- Опубликовано: 18 окт 2024
- For those already in the know, the first 40 seconds of this video are a fast "summary" of the experiment. The whole process follows. This was an experiment trying to reduce or eliminate false beats from a loose bridge pin by surrounding the pin with CA glue.
What a great video. Many thanks!
Thanks for sharing! It also looks like the strings are still pretty curved after the bridge pins. They could probably also benefit from straightening those.
Brilliant - many thanks!
I'm about to do the same on a 130 yr old Feurich with about 30 bridge pins. Nice video!
This is a super good demo! Now, a question. Why not pull the pin, squirt a little glue and then put Mr. Pin back in? Coverage, it seems, would be more complete. Thx!
Good question. This is how I was taught. I assume it's because of ease of use, and if the glue is extra thin, it will get in there without pulling the pin. The only reason I can think of to not do that is to disturb the area as little as possible. On a related note, I have recently had success eliminating false beats by lowering a string enough to get the coils loose, then bringing it back up. The neighboring string then goes flat & you have to bring that up. The theory is that it changes the bearing points around the bridge. I don't have any long term results yet, but I do know it doesn't work ALL the time.
@@PianoTechMaggie Yes! False beats creap up with several points of disturbance. String notching, bend patterning, etc. If the string is loosened with its friend taking up the slack, that can help. You must gently bump the string at the bend points with a drift to eliminate slack, destabilizing the tune. (you already knew that!)
@@TomPauls007 Thanks! Yes, I knew that, but it's always good to assume I might not know if it's about tech. I know WAY more about tuning. 😉
Thanks for this video! Great demo! Would you mind telling me what was the problem you experienced when the glue wicked across the bridge? Did the string bind to the bridge or otherwise increase the friction between string and bridge?This seems like it would be the most serious problem as the string would break when you tried to tune it.
CA glue doesn't stick to metal very well. That's why it works so well as a gap filler with tuning pins. There's no risk of breaking strings. However, there are 2 reasons I wan to avoid getting glue on the bridge: 1) false beats - If the dried glue gets moved so that it lifts the string in any way, we have defeated our purpose because that can create false beats. 2) aesthetics - It just looks bad. ;-)
@@PianoTechMaggie I really appreciate you responding so fast and thanks for the words of caution! I need to do this on the whole treble section of my old upright and I do not have a tilter but I will experiment with doing it on one string first to see if it causes a problem.
G'Day Maggie, could you tell me if you are working on a upright or grand. I have a Kawai K300 Aures that I bought almost new about 8 months ago and have a number of plain strings and some wound strings that have false beats. I cannot get to the plain string bridge pins but managed to check one of the wound strings and it does seem as thought there are loose bridge pins. It seems that to employ this technique for the plain strings you would have to take off the wound strings that are in the way. Is that correct ? Plus with it being a Aures you have these big black boxes in the way as well.
I'm unfortunately not familiar with that piano, but I use pipettes with whip tips to apply now which gives me extra reach. You can put a couple of large mutes or a folded temperament strip between 2 bass strings to spread them apart & get them out of the way. Also, I had one grand where the pins weren't lose but had worked their way out a wee bit. Tapping them in, gently, fixed the problem so check that, too!
Definitely better... I think lol
For a better "scientific" experiment try removing tension from a bad string and removing it, then replacing it and re-tuning it to see how that affects the false beat.
I FINALLY did the thing of lowering a string far enough to loosen the coils, then brought it back up, needing to bring up the neighboring string. It worked! It didn't work for a friend, so it doesn't work all the time, but it did work the first time I tried it. Thanks! 😉