I really want to thank you all for taking the time to talk about this issue.
Many valuable comments that I will be sure to consider.
I'm still missing a lot of info right now about the current case. I'll let you know when I get something new to show and tell.
Tmoose: it's not that I don't want to show you 25 glossy pictures with vibrant colors. I wish I would be able to show you that.
These failure happens on the other side of the globe we can't get all the information when we need to. We know it fails, not sure if maintenance is properly greased...
gtaw: There is grease that should be applied through a grease fitting in the pivot pin and you can see the greasing holes in the pivot. We have no way of knowing if the grease is applied regularly at our customer's.
Drawoh:
yes, I have started an analysis on this. It's just, that in the mean time, I'm asked to specify a torque for this bolt before I got all the results and I obviously want to be on the safe side.
yes it makes sense that the pivot is forced to turn (and shear the bolt, the lifting...
So from your comments, having a minimal torque (let's say 50 lbs.ft) would kind of make sense? To have plenty of room for the shearing.
Here is a non-exploded view:
The pictures above showed a shaft half-removed (man-removed, and not a sideways load) and remainings of bolts. That looks to...
Thanks for your answers so far.
At first my post was more about the theory that the higher the tension in the bolt, the less it would take to shear it.
But as I understand you want to know more about the reason why I ask the question.
So here is an image.
It's a load-lifting mechanism...
We have a case where we have a bolt that fails in shear.
Am I wrong to think that:
the higher the tension in the bolt, the less it takes to be able to shear the bolt?!
For example:
Bolt 1 is torqued at 600 lbs.ft
Bolt 2 is torqued at 200 lbs.ft
Let's pretend the friction due to the clamping...
We are required to weld on an hydraulic tank. What would be the safe way to do this (tank full, or tank empty?, etc)
If we drain the tank before welding, there would still be a film of oil on the wall, and the flash point of the fluid (~390°F) will likely be easier to reach than if the tank is...
Thank you all for your inputs!
Tmoose: Yes it's all at risk of corrosion. It's a component exposed to every type of weather.
It is understood that the case depth is very thin.
This component was initially designed using 50w steel with no treatments except zinc-plating!!
This component was...
We have a custom-design bearing race that needs to be surface hardened, but also needs to be corrosion resistant.
We believed that nitriding could achieve those two features.
The part is made out of 4140. On the draft, it is specified nitriding (but no specific type or process for the...
I'm trying to find the standard of this seal.
I thought it might be a BSPP seal but the thickness of the seal doesn't correspond to DIN 3869.
Do you have an idea about this seal corresponds to what standard and number (ISO XXXX ? DIN XXXX? SAE XXXX?)
Thank you
Hello to all,
Well, this is my first post.
I'm a mechanical engineer with ~10 years experience.
Each time I have a steel selection to do, I have a real hard time finding a "commonly available" type of steel (with a required yield strenght, for example) versus the shape required.
For example...
