A loadcell which only measure force
A loadcell which only measure force
(OP)
Hi, All,
I am in a very strange situation. I had to measure the force along a shaft which withstand both compression force and bending moment and direction of the bending moment keeps changing.
Because I am only interested in the compression force, I used to connect a six-axis loadcell, which can give me both compression force and bending moments, on the shaft. However, our new design does not permit me to put a loadcell in and I have to provide an alternative to the loadcell. The moment is quite large can break most of the one axis loadcell which is available on the market and fit my requirement.
Good part of the problem is that the working environment is not harsh at all.
It seems that I will have to build some strain gauge based sensor myself. But I feel headache about the changing bending moment and its influence on the strain. Any suggestions?
Thank you in advance.
Best.
Ming
I am in a very strange situation. I had to measure the force along a shaft which withstand both compression force and bending moment and direction of the bending moment keeps changing.
Because I am only interested in the compression force, I used to connect a six-axis loadcell, which can give me both compression force and bending moments, on the shaft. However, our new design does not permit me to put a loadcell in and I have to provide an alternative to the loadcell. The moment is quite large can break most of the one axis loadcell which is available on the market and fit my requirement.
Good part of the problem is that the working environment is not harsh at all.
It seems that I will have to build some strain gauge based sensor myself. But I feel headache about the changing bending moment and its influence on the strain. Any suggestions?
Thank you in advance.
Best.
Ming





RE: A loadcell which only measure force
RE: A loadcell which only measure force
add a 2nd set of s/g to confirm (i'm assuming that the axial load isn't changing in the shaft)
RE: A loadcell which only measure force
maybe you can get s/gs that broadcast their readings (RF) ?
RE: A loadcell which only measure force
http://www.omega.com/faq/pressure/pdf/positioning....
Ted
RE: A loadcell which only measure force
Best.
Ming
RE: A loadcell which only measure force
RE: A loadcell which only measure force
RE: A loadcell which only measure force
RE: A loadcell which only measure force
can we have some sort of pic of the problem ? some reason as to why the obvious (putting s/g on the shaft) doesn't work ?
RE: A loadcell which only measure force
One of the more popular techniques for measuring axial forces in the presence of bending forces is with low profile "shear beam" cells. They're available from Transducer Techniques and InterfaceForce amongst others.
RE: A loadcell which only measure force
RE: A loadcell which only measure force
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?
RE: A loadcell which only measure force
I attached a picture of the system. It is for a leg prosthesis, and the loadcell is labeled in the drawing. Because it is very hard to decide how big the moment will be and which direction the moment will point to when a person is walking with this device, averaging approach will not work.
Thank you for all the response.
Best.
Ming
RE: A loadcell which only measure force
RE: A loadcell which only measure force
RE: A loadcell which only measure force
The compression load is used for control purpose.
Best.
Ming