That was an amazing explanation jgKRI. Thank you so much for explaining this to me.
If you don't mind me asking how did you get the 3000lb x 4" effective length of the both to achieve the moment in the bracket of 12,000 lb-in? I am failing to understand where the 3000lb comes from. I am...
Unfortunately we do not have a software to perform an FEA on the bracket or bolts.
The pan is in the same environment (slightly corrosive due to all the chemicals and water) the entire time and it does not really change in temperature (might change by 1 or 2 degrees but nothing substantial)...
I have attached a picture of how the bolts are failing. It seems as though both bolts are failing in shear, however the bolts on the left hand side end up breaking first and we believe that they bang around a bit before the bolts on the right side finally break which is why they have a rounded...
I have also attached a drawing showing the bolt location connecting to the pan http://files.engineering.com/getfile.aspx?folder=290844db-2e54-4e9d-ac6b-560da9c5ee24&file=Bracket_dimensions.JPG
Hello,
I am trying to calculate the Moment and stress acting on the bolts connecting directly to the pan (please see attached images) to determine the bolt size and # of bolts to use. We are currently seeing the bolts fail way more often then they should be.
The method I have been using now...
For my own understand why would the 2 bolts not be acting as a fixed connection? What would need to be different in order for it to act as a fixed connection?
I understand if we were to look at it as a simply supported beam, the reaction forces on either end of the beam would be ~2500lb. But...
I have also attached a drawing showing the bolt location connecting to the panhttp://files.engineering.com/getfile.aspx?folder=49c5c2bb-e514-44ed-8148-07dd5c0de1c2&file=Bracket_dimensions.JPG
Hello,
I am trying to calculate the Moment and stress acting on the bolts connecting directly to the pan (please see attached images) to determine the bolt size and # of bolts to use. We are currently seeing the bolts fail way more often then they should be.
The method I have been using now is...
Thank you very much for all your help everybody. I really do appreciate all the time and effort everyone has spent helping me.
I believe I know what I need to do from here to resolve this situation.
Best Regards,
RohitGogna
I would like to confirm all the dimensions Tmoose mentioned in the above post are correct. Yes the bushing also has a flat surface on the end with rounded corners
Also I'm not sure if this is relevant but from all the failures that have occurred so far, there has been no damage to the brass...
Tmoose,
Yes it is a 1/4"-20 fastener.
The arm rotates around the bushing which is fixed.
We try to tighten up the bolt as much possible without creating issues with the rotation. There is no specific torque we tighten the bolt to.
dhengr,
Yes all of the bolts have broken in the same manner...
I have attached some images of diferent views with some more dimensions. The material of the arm is 1/2 H.R. Steel.
Pivot Arm Dimensions (force acting on this component)
http://files.engineering.com/getfile.aspx?folder=e3fe47ba-e585-4ab6-915b-f8f8bca75f7d&file=arm_dimension.pdf
Section View...
Typically the cylinder is used to rotate the arm up and down to allow some cores to roll onto it for the next stage of manufacturing, however there are a few procedures where the extra manufacturing steps are not required. During these instances the pivot arms are left down and the cores drop...
The bolt is in single shear.
Currently the threads are in the plane of the shear, however in the near future we will be custom fitting the bolt to avoid having any threads in the shear plane.
The bolt is made of Grade 8 Steel.
The thickness of the rotating arm shown at its lower limit in the...
Hello,
I am trying to calculate the shear stress on the bolt in the attached picture. This is just so I can confirm on paper that a 0.25" cap screw bolt is strong enough to withstand the applied forces at the pivot. Can someone please help guide me on how to calculate the shear stress at this...
