CMC lift failure

VenasNursery said:
No sir
Probably should have but 3600 hrs 5-1/2 years later I hope their fine
But thanks Monday morning or this weekend I have too now
Thanks Sir
Jk
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The original hydro tank mounts only consisted of 4 mounts...one at each corner of the bottom of the tank. The redesign changed how those 4 mounts fastened together and also added a 5th mount high up on the back side of the tank to reduce the torque on the bottom 4. I'm in the Chicago region where pot holes, rough train tracks and bridge seams are in abundance. The original 4 brackets could not handle that kinda terrain.
 
Phil said:
The original hydro tank mounts only consisted of 4 mounts...one at each corner of the bottom of the tank. The redesign changed how those 4 mounts fastened together and also added a 5th mount high up on the back side of the tank to reduce the torque on the bottom 4. I'm in the Chicago region where pot holes, rough train tracks and bridge seams are in abundance. The original 4 brackets could not handle that kinda terrain.
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Crazy
We’re just across the pond and believe me our roads the worst around I believe
Who knows
Definitely checking those out and thank you for the knowledge
 
MA Arborist said:
Sorry I wasn’t more clear. My point was to x ray the booms on the lifts that “have not” failed or cracked.
I’m sure that an x ray would be pointless after failure
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I don't think a true x-ray is used to test metal. There are a few magnetic methods or liquid penetration tests (but I don't think that is suggested on painted metal) or eddy current array testing. I'm not a metallurgical engineer, but I think that is something with electrical current flow) I was gonna buy this tester, but I hate paying shipping - that $3.99 was a deal killer for me :rolleyes: .
 
ATH said:
I don't think a true x-ray is used to test metal. There are a few magnetic methods or liquid penetration tests (but I don't think that is suggested on painted metal) or eddy current array testing. I'm not a metallurgical engineer, but I think that is something with electrical current flow) I was gonna buy this tester, but I hate paying shipping - that $3.99 was a deal killer for me :rolleyes: .
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A true x-ray is in fact used to test welds, actually. https://www.esabna.com/us/en/education/blog/radiographic-and-ultrasonic-testing-of-welds.cfm

My father is a mechanical engineer, working in manufacturing for the nuclear power industry, so I’ve grown up around a lot of steel, and blueprints, and X-ray tested welds. It’s amazing what an X-ray can tell you about a weld, even something as minor as a little weld flux or a tiny air bubble in the weld will show up.
 
Metallurgical analysis can reveal the cause of the failure, which can determine appropriate corrective actions. Apparently, top notch metallurgical analysts are few and far between. Years ago, I flew from Alabama to Rhode Island to hand deliver some large bolts for analysis. Flew back 2 weeks later to pick them up. We didn't want to ship them, as they were key evidence in an eight figure lawsuit. We had a really good in house Non-Destructive Examination department that performed x-raying, dye penetrant testing, mag particle testing, eddy current testing, etc., but they didn't do electron micrographs for examining grain structure.
 
Reach said:
A true x-ray is in fact used to test welds, actually. https://www.esabna.com/us/en/education/blog/radiographic-and-ultrasonic-testing-of-welds.cfm

My father is a mechanical engineer, working in manufacturing for the nuclear power industry, so I’ve grown up around a lot of steel, and blueprints, and X-ray tested welds. It’s amazing what an X-ray can tell you about a weld, even something as minor as a little weld flux or a tiny air bubble in the weld will show up.
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Well then, I stand corrected! thanks

that link just talks about welds...I assume the same could find cracks away from the weld too, but I'd assume weld failures are more common?

Are the pics failures at welds or "mid" beam???
 
deevo said:
Yes there were people using them like cranes Lifting logs.
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Cmc is releasing photos on Monday that lead them to a warning email back in December
Last night they released videos off testing on theses lifts
Pretty amazing
Made me feel good
The truth will come out and seems like cmc and all access are doing everything they can
Up equipment also seems to be standing behind them also
 
ATH said:
Well then, I stand corrected! thanks

that link just talks about welds...I assume the same could find cracks away from the weld too, but I'd assume weld failures are more common?

Are the pics failures at welds or "mid" beam???
Click to expand...
I would presume cracks could be found elsewhere too, I am just familiar only with X-ray being used to inspect welds in critical applications. And I’m sure weld failures are more common, as the weld is typically made by a fallible human, and is also the weak point in the system to begin with.
 
Metal masts on boats are tested for weak welds etc in some specialized yards. If memory stands it was with some sort of vibratory sensor??
 
That would make sense...I wondered if there could be a sound tres. A vibratory test would be the same thing. I was picturing how you can test, for example, grinding wheels. They have a distinct ring that goes away with invisible cracks. Metal would behave the same...but the boom wouldn't "ring" so you just need something more sensitive to pick up the change in pattern.

I bet if you gently tapped on every inch of the boom enough times, you could also pick up the change by ear, but that could take a long while.
 
bck said:
I wonder is transporting the lifts could lead to cracks as well? All the bouncing around on shitty roads, speed bumps, just driving to fast in general ?... I feel like my trucks are going to fall apart sometimes hitting a pothole
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I shared this thread with a friend who is a weldor. The company he works for does arbo-related welding too. Repairs and production work too. My buddy looked at the tears and said that damage like that can come from
'hard' use. Stopping and starting motion with no feathering of the controls. Slam dunking is a term that comes to mind.

Anyone who has snapped Silly Putty will understand. A little stretch then a clean break. Not a stretch to break like pizza cheese.

I wonder how the boom is cradled for transport. does it put the load on the tube between the cylinder attachment points?
 
ATH said:
I don't think a true x-ray is used to test metal. There are a few magnetic methods or liquid penetration tests (but I don't think that is suggested on painted metal) or eddy current array testing. I'm not a metallurgical engineer, but I think that is something with electrical current flow) I was gonna buy this tester, but I hate paying shipping - that $3.99 was a deal killer for me :rolleyes: .
Click to expand...

Non-Destructive Testing/ NDT, Non-Destructive Examination.

Mag particle, Dye Penetrant, X ray is another acceptable method.

Quick Link to explain better than I can.
amarineblog.com

NDE vs NDT, NDI understanding

Non-destructive testing (NDT) is a testing and analysis technique used by industry to evaluate the properties of a material, component, structure or system for characteristic differences or welding…
amarineblog.com amarineblog.com


On Industrail jobs where welding is concerned, there are 2 general classifications of welding: Structural & Pipe.

X-Ray testing is typically performed on 10% of welds completed on a Piping project- if no defects are found that’s great, but if defects are found then the frequency of testing goes up fast.

Pipe welds are in all sorts of funky positions & x-rays are performed: that’s just how it is.



I am following along on Facebook & the count is now 9 or 10 units: That’s 10/1,000 or 1/100 as of 02/27.


If CMC is serious about making this right they will he arranging for 3rd Parties to perform this test Post Haste.


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