Do you mean a broken one ?
Kuhn Axis weigh cell broken
- Thread starter Henry B
- Start date
Do you mean a broken one ?
- Location
- Llangernyw
Yeah broken one
They told me after we took it that it might be internal issue instead of corrosion around the wire going in it which is an easy fix so to investigate would take time and no promise it could be fixed so yes a broken one !
Ours is at dk electrics , when passing I will pick it up and send on.Must be too much money about; Man has offered several times to try and source a pattern part, and nobody has yet bothered to put him a knackered one in a jiffy bag...
Pheasant Surprise
Member
- Location
- Woodbridge, Suffolk
What’s the typical failure pattern that you have seen with load cells, if there is such a thing?
Is it usually the wiring (presume an easy fix) or the whetstone bridge (fairly straightforward electronics) or is it the metal section/blank that has fatigued/failed (bin job I suppose)?
I guess calibration must be the critical thing as these things are pretty straightforward - other I suppose than precise milling/calibration of the blank?
- Location
- Llangernyw
usually wiring as you say pretty simple fix, but it seems with the loader/spreader type cells they are normally double ended shearbeam type and that is rarely a fatigue issue, normally its failure of the sealing which in turn leads to failure of the wheatstone bridge internally, sounds like a simple fix but these are potted and thermally sealed onto the loadcell substrate and to remove and replace with correct transducer assembly is a nightmare.its not a simple case of putting replacement resistors in(they dont fit) and its naerly impossible to get them placed accurately into the cell itself.
Pheasant Surprise
Member
- Location
- Woodbridge, Suffolk
Thank you for the explanation. Makes a lot of sense!
Forgot about the potting and sealing aspect. Nightmare.
TechWise
Member
- Location
- South Ayrshire, Scotland
@Pheasant Surprise
We built little load cell amplifiers during my undergrad. Bloody nightmare! The minuscule deformation of the beam translates into a tiny change in resistance which causes a tiny change in current across the bridge. That's before you even consider the effects of temperature on the bridge. It's quite common to use two strain gauges in the bridge at exactly 90 degrees to one another. One is doing the actual strain measurement whilst the other doesn't change at all under load. However, the two respond in exactly the same way to temperature so the temperature dependence is theoretically cancelled out.
I don't see how you could ever hope to fix one outside of a laboratory clean room with some very specialist kit
We built little load cell amplifiers during my undergrad. Bloody nightmare! The minuscule deformation of the beam translates into a tiny change in resistance which causes a tiny change in current across the bridge. That's before you even consider the effects of temperature on the bridge. It's quite common to use two strain gauges in the bridge at exactly 90 degrees to one another. One is doing the actual strain measurement whilst the other doesn't change at all under load. However, the two respond in exactly the same way to temperature so the temperature dependence is theoretically cancelled out.
I don't see how you could ever hope to fix one outside of a laboratory clean room with some very specialist kit
cosmagedon
Member
- Location
- North Wales
Bump again! Was a source for pattern cells ever found?
D King repaired one for us , it’s a spare so won’t know if it works till it’s on but I’m sure it will be ok
cosmagedon
Member
- Location
- North Wales
Done one last year for usHe's already looked at these and they cant be repaired
- Location
- Montgomeryshire
Time for another bump….
One of my weigh cells is on the blink on my Trigger’s Broom spreader. Cheapest I can get local dealer to is £740.
Did we ever find a non-Kuhn replacement? Or do I have to bite the bullet?
@Allied Weighing , did anyone ever send you a broken cell to look at? If not, I’d be more than happy to send you mine to look into (repair?), once I’ve found a replacement.
One of my weigh cells is on the blink on my Trigger’s Broom spreader. Cheapest I can get local dealer to is £740.
Did we ever find a non-Kuhn replacement? Or do I have to bite the bullet?
@Allied Weighing , did anyone ever send you a broken cell to look at? If not, I’d be more than happy to send you mine to look into (repair?), once I’ve found a replacement.
- Location
- Llangernyw
Not as yet.Time for another bump….
One of my weigh cells is on the blink on my Trigger’s Broom spreader. Cheapest I can get local dealer to is £740.
Did we ever find a non-Kuhn replacement? Or do I have to bite the bullet?
@Allied Weighing , did anyone ever send you a broken cell to look at? If not, I’d be more than happy to send you mine to look into (repair?), once I’ve found a replacement.
cosmagedon
Member
- Location
- North Wales
I emailed every company I could find on google about them and everyone got back saying there's nothing off the shelf that will match, the manufacturer of the original ones will only deal with Kuhn/Rauch so that's a dead end too. I ended up buying genuine ones, they are uprated now to 5ton each.
I do have a sensibly priced fully working 40.1w for sale if your interested, all new cells and new style actuators
I do have a sensibly priced fully working 40.1w for sale if your interested, all new cells and new style actuators
- Location
- Montgomeryshire
I emailed every company I could find on google about them and everyone got back saying there's nothing off the shelf that will match, the manufacturer of the original ones will only deal with Kuhn/Rauch so that's a dead end too. I ended up buying genuine ones, they are uprated now to 5ton each.
I do have a sensibly priced fully working 40.1w for sale if your interested, all new cells and new style actuators
I have new actuators already, along with one new agitator. Maybe you should break yours and sell for spares?
I’m tempted to leave as is, and just set the slides on manual like I did a couple of days ago…..
- Location
- Montgomeryshire
Time for another update….
i decided to bite the bullet and replace the dodgy weigh cell on my 40.1W, had sorted a discount on the new one (down to £820!) and was planning on donating the old one to @Allied Weighing to see if he could source them for future posters on this thread.
After checking on here again, I noted comment of new ones being upgraded, so thought it wise to check that you could replace them singly.
Dealership didn’t know, so put a technical query into Kuhn, and a good job they did. It turns out that they are now updated and that you do need to replace the pair if you have old ones.
The only good news is that Kuhn also offered a pair of exchange refurbished (& updated) ones at £822 for the pair. Still plenty of money of course, but it would have remained a ‘manual’ spreader if the alternative was £1600+!
The bad news is that allied weighing still won’t be getting a dead one sent to him…
i decided to bite the bullet and replace the dodgy weigh cell on my 40.1W, had sorted a discount on the new one (down to £820!) and was planning on donating the old one to @Allied Weighing to see if he could source them for future posters on this thread.
After checking on here again, I noted comment of new ones being upgraded, so thought it wise to check that you could replace them singly.
Dealership didn’t know, so put a technical query into Kuhn, and a good job they did. It turns out that they are now updated and that you do need to replace the pair if you have old ones.
The only good news is that Kuhn also offered a pair of exchange refurbished (& updated) ones at £822 for the pair. Still plenty of money of course, but it would have remained a ‘manual’ spreader if the alternative was £1600+!
The bad news is that allied weighing still won’t be getting a dead one sent to him…
King chap at Stratford did one for us but yet to put it on and try it
- Tags
- kuhn weigh cells
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