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| Any load cell experts on the forum? |
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| PekkaNF:
So it connection behaves like standard four wire and four strain pads in bridge? But there are those weird spider adapters and pins that go on spesific places as well? Looks like there are small holes to locate the pins and concentrate the force on certain area? Or did I got something wrong? If it is really universal direction /concentric I would think of a structure that flexes axially when loaded and this axial direction would be then returned to standard one way force measurement. Pekka |
| awemawson:
The dimples in the load cell are to locate the 2 or 3 jaw adaptors, but the jaw force isn't applied to the pips that go in the dimples, but rather onto the 2 (or 3) pads between them. The destructions refer to the adaptors as 'protectors' When I measured the arms of the bridge when I was fixing it they read about 75 ohms each iirc so not capacitive. |
| DMIOM:
Sorry if I wasn't too clear, with the "adapters" I wasn't implying pressure on the locating pips, but what I was trying to convey was that, courtesy of those pips/dimples, the jaw-receiving-pads will always fall in a finite number of locations (6?) around the periphery, so if there were discrete sensors those could be their sites... Dave |
| PekkaNF:
Dave here might be into something. I'm familiar only commercial four wire / full bridge type (and some inductive ones that strain changes permeability of the iron) but there seems ton be "rosettes" I.E. multiple strain gages on one strip. I'm having difficulties visualising shape of the cavities and beam to measure this. This type I'm familiar with: http://www.weighing-systems.com/TechnologyCentre/BalancesZVZ/rekstroo.gif or http://www.mensor.pl/indukcyjnosciowa_metoda_pomiaru_masy/new_inductive_method_for_measure_of_mass_clip_image030.jpg I even know that torque of a shaft is easy to measure using straingages in diagonal...but static force measurement I know allways have to have "spring" stiff in one direction to minimise unwanted signal and flexible enough on measurement direction. I really can't figure out any other "universal" direction measurement than displacement, pressure sensor could have a straingages and "fluid" could be more like teflon plug or high viscose liquid more like dried out silicon....but then don't know the use of these mysterious "pads" other than protecting the surface of the transducer. fascinating. Pekka |
| awemawson:
It's one of those puzzles that realistically doesn't need solving, but to not solve it leaves irritating loose ends :bang: |
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