General > General Technical Chat
A serious (as in not troll) requestfor help w/ultrasonic transducer
floobydust:
L&R Ultrasonics Tempo 400 PC board pic and schematic, apparently 100 84kHz: https://www.eevblog.com/forum/repair/matching-ultrasonic-transducer/
I think because it has no tank, just a small jar and the higher frequency, it might do better with fine items. It's only got one electrolytic capacitor, one output cap to replace.
OP, your donut in the pic is damaged, busted, dead. Not an expert or pics/size of other parts but it looks like an Langevin transducer maybe like these pics. Many companies make them and the parts.
You could try to figure out the original manufacturer with some detective work. Or just source another donut i.e. rings and many many more manufacturers of the parts. It's not all unicorn magic.
L&R does have some kind of dosimeter that could be used to compare old/new.
watchmaker:
--- Quote from: floobydust on April 23, 2024, 02:19:59 am ---
OP, your donut in the pic is damaged, busted, dead. Not an expert or pics/size of other parts but it looks like an Langevin transducer maybe like these pics. Many companies make them and the parts.
You could try to figure out the original manufacturer with some detective work. Or just source another donut i.e. rings and many many more manufacturers of the parts. It's not all unicorn magic.
L&R does have some kind of dosimeter that could be used to compare old/new.
--- End quote ---
Floobydust,
No shit :-DD Thank you for helping me figure out what to call the thing! I figured someone here would know how I should start sourcing it.
The point is that these machines are failing because of transducer (Donut) failure. And to avoid buying an $8K machine to stay in business, my colleagues would benefit from the ability to have the "donut" replaced. Not by me, but by the last buggy whip maker.
I destroyed the one in the picture you see. It was one that no longer functioned and I wanted to see what was need so I could use the expertise here to possibly source a manufacturer who could make 50 to 100 pieces.
All,
Not interested about "what should be". The situation is what it is and started 30 years ago when the brands began this process. It was the first major case to override the Xerox doctrine and reestablished parts restrictions to independent service organizations.
The horses are out of the barn, it has all been litigated and judged. So if anyone else can help with potential manufacturers of the element, a referral would be useful.
Thanks and regards,
Dewey
floobydust:
I thought maybe a gorilla over-tightened it and crunched it, it's broken in so many places :horse:
I haven't see any pics of the transducer assembly. It's got a horn or an arm or a booster?
You need dimensions of the arm, you already have them for the donut, not sure if all aluminum - then go to any manufacturer and ask for engineering help or maybe hit up someone like this https://blog.piezo.com/horn-transmission-and-its-applications
Engineering details here: https://www.ultrasonic-resonators.org/design/transducers/transducer_design.html
They show only a few different piezo materials used. I hope yours does not use beryllium electrodes.
You could order up the same size part and simply try it out too.
IanB:
--- Quote from: coppercone2 on April 23, 2024, 01:48:39 am ---what in a watch requires this nonsense? The only part where its not cringe worthy is prep before plating. then its important to be really clean, for the highest quality. But its little more then careful rinsing wiht clean stuff. Optics seems harder to clean because of scratching, and fragile thin films... but its only a problem if you basically don't spend any time researching and don't spend any more (as I found out with some laser stuff, because its basically plastic coated and there is some incompatibilities that seem like nonsense to any home owner that has glass (late roman empire ) (no ammonia))
--- End quote ---
The main issue is to remove old, dried on lubricant, and various particles of dust and grit that might be hidden away in crevices and pivot holes where they can cause major problems.
It's only the mechanical parts that go into a cleaning machine. Decorative parts need careful and separate treatment to avoid ruining them.
Here is a video that shows what the whole process is about, using a non-ultrasonic machine:
IanB:
For anyone who wants an ASMR video to relax to, here is a complete tear down and reassembly of a watch. I can only dream of being able to do something like this. I have struggled so much even getting little tiny screws back into their holes.
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