tolerances for stagnated cap

[wert]

If you had posted a sketch maybe you would help us find a solution to your problem. I still try to say mine. externally fill the tube at one end (end pass). then realize a female thread cap that you will screw on the tube trying to insert a seal somehow (frontal thread on the bottom of the cap?). I think working on the size, it should not be a problem to find the exact weight.

 

[infallibile_GF]

here is the drawing of the finished piece as it must come

 

[Fabietto]

Then I have to work the lathe. the float must have a precise shape of a cone with precise measurements and conicity to the cent. Moreover the surface must have a very low roughness and must be as smooth as possible, to avoid disturbances in the flow of the liquid, which could make the instrument unpredictable.

Okay, as I said.

a curiosity. where are we? that you need precise measures to the cent, etc.
the normal flowmeters I see around always have a very spartan conical float.

Moreover, how many of them produce? 1 - 10 - 1000.. If you hypothesized an interference insert, I think not more than a dozen. .

 

[wert]

here is the drawing of the finished piece as it must come

Well, if I could raise the cap by 1mm, maybe you could fit a ø1 rope or hold. at that point, since the pressure is from the outside, the planting interference should not be exasperated. then I would make a single piece cap and spacer 3.

 

[infallibile_GF]

Okay, as I said.

a curiosity. where are we? that you need precise measures to the cent, etc.
the normal flowmeters I see around always have a very spartan conical float.

Moreover, how many of them produce? 1 - 10 - 1000.. If you hypothesized an interference insert, I think not more than a dozen. .

I have to make four pieces. I don't know, just that from the calculation programs to size the pieces come out certain values and here in company they want those values to be accurately respected.

 

[MassiVonWeizen]

In my opinion, if you make the insertion with interference and both the cylindrical tolerance and the roughness of the coupling is fine there are no dangers of threading.
among other things is a float that for the shape with which it is built will have the cap facing up; this means that the stopper will be occasionally invested by the liquid (during any inspections of the system I imagine) therefore the possibility of threading in a fitting to interference are minimal and could be ascribed to the normal exercise of use.
a good thing would be to build at least one test and immerse it completely and verify after a tot of time the estate.

 

[Fabietto]

In my opinion, if you make the insertion with interference and both the cylindrical tolerance and the roughness of the coupling is fine there are no dangers of threading.
among other things is a float that for the shape with which it is built will have the cap facing up; this means that the stopper will be occasionally invested by the liquid (during any inspections of the system I imagine) therefore the possibility of threading in a fitting to interference are minimal and could be ascribed to the normal exercise of use.
a good thing would be to build at least one test and immerse it completely and verify after a tot of time the estate.

from what I read, it has the shape of a float, but it is inserted inside the tube, in which flows the acid, and therefore it is completely immersed in the fluid. and maybe the internal pressure can approach the 30 bar required by the customer. therefore the upper part is always in contact with the liquid.