Home Made Ultrasonic Cleaning Tank

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Introduction: Home Made Ultrasonic Cleaning Tank

Hi,
I have constructed a 40KHz, 100W ultrasonic cleaning bath using a thick cooking pot and some off the shelf parts.
Two 40KHz transducers, part number SMBLTD45F40H, were attached to the bottom of a thick wall cooking pot using dual component Epoxy (Home Depot). It is important to mix the correct proportions so it will cure to a solid piece and not flexible as it would dampen the vibration. The ultrasonic generator used was also found at the same place (STEMINC) and it is part number SMUG100W40ND. This generator is 100W and each transducer is 70W when installed alone or 50W each when installed in parallel. You must connect two SMBLTD45F40H and the system cannot be turned ON until all connections are made and the generator is connected to the transducers ATTACHED TO THE TANK. If not, the generator will be damaged. It cost me not to pay attention to this detail!.
Connections are simple. The electrode between the two piezo rings on the transducer is the positive. So connect the positive electrodes from the transducers (in parallel) and connect to the positive output of the generator. Then connect the negative electrodes from the transducers (in parallel) and connect to the negative output of the generator.
In my build I used Glue, instead of having bolts on the bottom of the pan, You con also have bolts welded to the bottom of the reservoir. Depending on the thickness of the wall of the container you will need to check if it is feasible.

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Is it really worth it to buy a $200 generator, two $35 transducers, good epoxy, etc? Or should I buy a used unit online? Otherwise, thank you for this info. Nice, simple write-up.

62 Comments

Agreed, it looks nice and way cheaper than a commercial sonicator. Have you tested its cleaning ability? What are you using for?

1 reply

Hello,
Thank you for your message.
We use to clean\degrease industrial parts.
The initial project that you see here has now evolved and we have 2 additional tanks with a lot more volume and space for longer parts.
Regards,
Ozzy

Cool! What glue did u use to attach transducer to the "tank"? Thanks you.

1 reply

Hi Amalia,

Thank you for your message.
I used Epoxy glue, two components, Araldite 2012.
You can see the specs on the link below. It is excellent for metal to metal or metal to anything rigid. It is IMPORTANT to mix it exactly as the instructions says. Otherwise, it will not cure to a glassy finish and will act as a shock absorbent layer and the performance of the transducer will not be optimum.

http://www.farnell.com/datasheets/318905.pdf

Regards,
Ozzy

Excellent project!!! I have been wanting to build an Ultrasonic cleaner for some time since purchasing a manufactured unit is very costly.  Observation: Since you have the transducers epoxied to the pot they will be almost impossible to remove. My question: How do you change out a transducer if and when it goes bad? Solution: I notice in the specs that the transducer has a pre-tapped hole for an M10 mounting stud. I would opt for a mounting stud. This can be accomplished by drilling 2 - M10 holes in the pot. Next tap the holes, then thread from the inside, a stainless steel M10 cap screw, then braze or silver solder the cap screw from the outside. Take care to keep the fillet as small as possible so as not to impeed the tightening of the transducer flush to the pot otherwise some touch-up grinding with a mini-grinder or dremel tool will be required. Further, poor mechanical flush contact to the pot will damage the transducer and possibly the generator board. Last a mini-grinder or dremel tool to cut off the cap screw head on the inside of the pot to restore the smooth bottom.

Hello Steven,
Thank you for your message.
Yes. You can use this ultrasonic system to clean clock parts. I don't know if you can put the whole clock inside of the reservoir because it may have certain delicate clock parts that may be damaged by ultrasonic waves. Clock shops normally use ultrasonic cleaning baths.

I am going to transform an old french frying tank see picture) into an ultrasonic cleaning tank.
The resistance to warm the oil can serve to warm the cleaning fluid, I just have to glue the transducers under the tank.
I ordered transducers and electronics at ali-express, as soon as they are delivered, I'll let you know how it went.
I found an epoxy glue called fluid steel that is boiling water resistant, but it also says "opvangen van trillingen"
Do you think it will do the job or will it absorb the vibrations so nothing goes into the cleaning fluid ?

opvangen (ww.)to collect ; to admit ; to receive ; to intercept ; to absorb ; to catch on way ; to bear ; to capture ; to accomodate ; to give shelter ; to take ; to catch ; to pick-up ; to pick up ; to compensate

http://www.rectavit.be/nl/ProductTechnischeFiche.a...

Also, in order to have a very good glueing, would it be good idea to switch on the transducers for a short time, once the glue is applied and the transducers are pressed against the tank, to remove eventual air bubbles and to make a better connection between the tank and the transducer ?
On the site of a transducer manufacturer I read
Establish impedance control technology during gluing process to reduce the gluing impedance of oscillator and improve the electro-acoustic conversion efficiency.
But it is not clear to me what they mean by that.

frietketel.png

Hi, I just found this, and I am interested to make one myself.

Would it be possible to glue the transducers to a metal plate and then submerge the top side of this plate into any recipient, for example in a bucket ?

ultrasound cleaning plate.png
1 reply

Hello,

You can do that but the transducer should be enclosed on a metal box to avoid short circuiting.

I thought that you needed a mass on the small side of the transducer (it emits the ultrasonic wave in the middle, and I thought it would direct towards the easiest direct... or in the air in this case). Are you finding any issues with loss of efficiency?

Thanks

1 reply

Hello,
Normally this type of transducer vibrates expanding and contracting on its height so the surface where it is attached to will vibrate.
I don't see any loss and, I believe, that is the correct way to mount it. If you look on any setup on the web you will see that the transducers is attached to the wall of the tank.
We now have 2 more tanks with different frequencies and they were all made using the same principle.
Regards,

Hello,

First thanks for your instructable. I want to ask a simple question about ultrasonic transducers. Is the little stud comes with the transducer have to contact the tank or is it some adjustment part when we decide to weld the transducer to the tank. Thanks for your help in advance.

Regards,

Untitled.png
2 replies

Hello,
The stud is normally welded to the tank and then you screw the transducer to it. The stud needs to be completely perpendicular to the tank wall otherwise the transducer will not be flush with the surface thus not transferring the maximum power as it should.
I used Epoxy because the "tank" I used was inexpensive and the work involved in having the stud perpendicular to the tank was not worth when compared to the simplicity of the Epoxy. If a transducer stops working it is much easier to buy a new "tank" because of its cost.
Regards

Thanks for your kind response. So, I don't have to use the stud since I'm planning to proceed with the epoxy solution.

home made ultrsonic cleaner sounds good.for this system that is 100 watts and 40khz with 220 input voltage and two 50 watts transducers which are connected to them,could i ask you the output voltage?
thanks
mehran1376
mehran123456789

home made cleaner sound good.for this system that is 100watts and 40 khz with two transducers of 50 watts,could you tell me the output voltage when the input voltage is 220volt?thanks

it looks so good.but if we use transducers with 50 watts so could i ask you please to tell me the output voltage of generator?
thanks

1 reply

Hello,
In my case I used a 110V AC ultrasonic generator but they also have the same ultrasonic generator in 220V AC.

I am going to put together a cleaner but I have a question, my transducers have a bolt in the center is that glued down first and then the rest of the transducer??