foreign gauge / estensimetry

[Fulvio Romano]

Good morning to all,
I find myself having to grab a piece with a two griffe clamp. I would like to understand when I took that piece (the size may vary).
for reasons I'm not telling you, the clamp is custom, I have two hydraulic cylinders moving the griffe.

I have no way to put proximity, and an oil pressure transducer helps me little, because if the fingers arrive at the end of the race without taking the piece, the pressure rises equally.

I thought of using strain gauges to feel the strain of the griffe, it would be ideal, because I might also know the strength I'm exerting on the piece. However my knowledge this type of sensors is reduced to some university reminiscence, I have no idea either of possible suppliers or of industrial use.

goes from if I need a closed package, with linearized output, possibly 4-20ma. I can also settle for voltage outputs, but I certainly do not map the load curves according to the temperature...:redface:

Who suggests me some smart supplier?

Thank you very much

 

[PierArg]

I don't know half of your business.
Could you use sensors on the hydraulic cylinders that indicate the race?

there are some cylinders that already have predispositions

 

[Fulvio Romano]

I don't know half of your business.
Could you use sensors on the hydraulic cylinders that indicate the race?

there are some cylinders that already have predispositions

I can't.
the cylinder is made ad hoc. Why? I don't know, hands of the mechanic:redface:

apart from the jokes, it is a jewel of mechanics, but unfortunately it has some special choices that prevent me from using the standard sensory.

 

[SER.CAD]

Good morning to all,
I find myself having to grab a piece with a two griffe clamp. I would like to understand when I took that piece (the size may vary).
for reasons I'm not telling you, the clamp is custom, I have two hydraulic cylinders moving the griffe.

I have no way to put proximity, and an oil pressure transducer helps me little, because if the fingers arrive at the end of the race without taking the piece, the pressure rises equally.

I thought of using strain gauges to feel the strain of the griffe, it would be ideal, because I might also know the strength I'm exerting on the piece. However my knowledge this type of sensors is reduced to some university reminiscence, I have no idea either of possible suppliers or of industrial use.

goes from if I need a closed package, with linearized output, possibly 4-20ma. I can also settle for voltage outputs, but I certainly do not map the load curves according to the temperature...:redface:

Who suggests me some smart supplier?

Thank you very much

Try to hear this como company, I don't know what figures travel...
but they definitely have everything they do for you!
http://www.instrumentationdevices.it/default.asp

 

[cacciatorino]

I used them in his time for the graduation thesis, and I'm shocking them because I think they're lab tools, not strong enough for industrial use.
Would the bonding resist dirt, oil? would the strain gauge itself resist the maintainer that during the night shift goes away from screwdriver and hammer to solve a jam? Would the cables and connectors have thousands of twists and wrist movements? Then the idea of measuring strength I don't think is very useful, eventually if you know the pressure of oil you also know the strength, they are proportional.

If you want to send me an image of the application, I have now developed a certain ability to put sensors everywhere! verify whether you can use optical tools to land or reflect, as well as inductive sensors.

 

[TheGio]

I have no way to put proximity, and an oil pressure transducer helps me little, because if the fingers arrive at the end of the race without taking the piece, the pressure rises equally.

I am not very hardware in hydraulic components so The big shot:
... if you carry out a flow control as well as the pressure you should be able to detect the end-of-the-race condition.

 

[Dade73]

Good morning to all,
I find myself having to grab a piece with a two griffe clamp. I would like to understand when I took that piece (the size may vary).
for reasons I'm not telling you, the clamp is custom, I have two hydraulic cylinders moving the griffe.

I have no way to put proximity, and an oil pressure transducer helps me little, because if the fingers arrive at the end of the race without taking the piece, the pressure rises equally.

I thought of using strain gauges to feel the strain of the griffe, it would be ideal, because I might also know the strength I'm exerting on the piece. However my knowledge this type of sensors is reduced to some university reminiscence, I have no idea either of possible suppliers or of industrial use.

goes from if I need a closed package, with linearized output, possibly 4-20ma. I can also settle for voltage outputs, but I certainly do not map the load curves according to the temperature...:redface:

Who suggests me some smart supplier?

Thank you very much

Infernal applications aside:biggrin:, you thought about the pressure transducer managed by the program with a timer, I explain: the x bar pressure should be reached in y seconti otherwise the piece socket is false.

 

[Fulvio Romano]

I am not very hardware in hydraulic components so The big shot:
... if you carry out a flow control as well as the pressure you should be able to detect the end-of-the-race condition.

on paper, maybe... I have a few millimeter race of a cilidro d30

Infernal applications aside:biggrin:, you thought about the pressure transducer managed by the program with a timer, I explain: the x bar pressure should be reached in y seconti otherwise the piece socket is false.

I can't discriminate against the fact that I reached the end of the race instead of grasping the piece.

 

[Matteo]

Good morning to all,
I find myself having to grab a piece with a two griffe clamp. I would like to understand when I took that piece (the size may vary).
for reasons I'm not telling you, the clamp is custom, I have two hydraulic cylinders moving the griffe.

I have no way to put proximity, and an oil pressure transducer helps me little, because if the fingers arrive at the end of the race without taking the piece, the pressure rises equally.

I thought of using strain gauges to feel the strain of the griffe, it would be ideal, because I might also know the strength I'm exerting on the piece. However my knowledge this type of sensors is reduced to some university reminiscence, I have no idea either of possible suppliers or of industrial use.

goes from if I need a closed package, with linearized output, possibly 4-20ma. I can also settle for voltage outputs, but I certainly do not map the load curves according to the temperature...:redface:

Who suggests me some smart supplier?

Thank you very much

hi, I didn't know if you had to make a single piece, or a series production: if you need information about strain gauges and measuring instruments contact me as well (I worked in the industry for three years).

ps: the output will be almost certainly live, typically 0-20mv/v, but in your case it might be enough much less (depending on the redevelopment you need, but I think it is low, more than a measure is a force limiter).

 

[PierArg]

Honestly, based on the info you gave, nothing comes to mind. . otherwise why don't you put optical sensors on the pallet that contains the pieces to grab?

when the piece is taken the sensor sends the signal.. .of course I have no kind of information that tells me if the piece then lost in the street because it was badly grasped =)

 

[TheGio]

on paper, maybe.. .

...if by paper you mean the course of drives at the university you caught us, :finger: it is my only "experience" in oleodynamics.
However you are right, with races and diameters so small it should be difficult to make a flow measurement.

Anyway you talked about 2 cylinders, you could try with a singularized pressure control for each cylinder.
I'll explain better.
-I press the two cylinders and both reach the x pressure (I don't know if in socket or vacuum)
- I close the warrant of one of the two
- increase the pressure on the other and verify if there is a change of pressure on the first.

 

[Fulvio Romano]

Honestly, based on the info you gave, nothing comes to mind. . otherwise why don't you put optical sensors on the pallet that contains the pieces to grab?

when the piece is taken the sensor sends the signal.. .of course I have no kind of information that tells me if the piece then lost in the street because it was badly grasped =)

simple. ..because there is no pallet. the "piece" is mounted on a tool machine, and I have to replace it with a new one.
When I take it, it may not be properly in place, so I have to make several attempts until I "I feel" the correct grip.

 

[Fulvio Romano]

-I press the two cylinders and both reach the x pressure (I don't know if in socket or vacuum)
- I close the warrant of one of the two
- increase the pressure on the other and verify if there is a change of pressure on the first.

smart idea...but the piece is mounted on the spindle...which does not move... .

 

[TheGio]

smart idea...but the piece is mounted on the spindle...which does not move... .

:frown: I imagined it in a pallet with a minimum of ease:frown:

 

[PierArg]

I'm sorry, but why is there a risk that I don't take the piece well?

Once you grab the piece, this must be "suited" super finely in a pallet or "pumped" in a container?

 

[Fulvio Romano]

I'm sorry, but why is there a risk that I don't take the piece well?

because it could:
- No.
- to have consumed too much, then if I grab it, I can escape
- be of the wrong type, so without the embossed edge on which I have to take
- I could take it properly, but I could run away anyway.

 

[PierArg]

mom how complicated you are....;-)

I think you will never be able to take into account all these potential problems at the same time.

and if you use magnetic coatings on the pliers?
This obviously solves only one of your problems... provided the piece is ferromagnetic and as long as you don't care about the precision on the grip.

 

[vale61]

I don't know if he can do it for you.
years ago I used a pel pneumatic sensor (I'm not sure of the name), in practice by a small nozzle comes out air and depending on the distance of the surface to be detected gives you a different electrical signal.
my application was to verify the tolerance limits (+/-0.2)) of an object.
The advantage is that I spill out air the sensor you can use it in dirty environments, it is not influenced by the type of material, you can make a small nozzle (copper) and place it where it is most necessary etc.
The disadvantage is the ideal air consumption would only be able to activate it when the sensor works.
Bye-bye.

 

[Plus ENGINEERING]

passionate about this problem!
I say mine too: provided that clamp and piece are electrical conductors, exploit an electrical continuity signal? ...if the piece is not there the circuit opens and when the circuit closes. Of course it is necessary to make sure that if the piece is not there, the pliers have an end to run so as not to let them close completely touching.

 

[ebrazz]

do a search for load cells, are equipped with strain gauge and have the most diverse uses, years ago I used them to weigh hay on agricultural trailers, so if well placed they have no environmental problem.