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Hi MrNut So if the cylinder is vertical and exerts 12kN downward force then you need to generate something like three to four times that figure of preload depending on the coefficient of friction across the two bolts in order to stop any slippage of the cylinder relative to the clamp...

Hi MrNut We would need to know the value of the tensile loads which are pulling on the clamp because these appear to be pulling the bottom half of the clamp away from the cylinder. That said if the cylinder is free to drop into the bottom half of the clamp under its own weight then you only...

Hi Morganwz What is not mentioned in your original post is what tension the bolts are preloaded to. However if the bolts are tensioned to 90% of the bolts tensile strength then they should be replaced and not reused. A simple rule and isn’t subjective but the bolts will deteriorate over time...

Hi Chase123456 In order to calculate the tension that would clamp the parts without damaging them you would need to know all the stiffnesses of the component parts and as already stated you could play around with numbers forever. What I would do is some trial assemblies starting with tightening...

Hi Is it possible the spring wire has work hardened ?

Hi ScottAC In the first instance you need to multiply the sealing area by the pressure to obtain the force trying to throw the block off and in your case the force will be acting on both ports. The force obtained from the above will have to be resisted by the bolts so this will give you some...

Hi Pedee68 I would check the shear stress on the internal thread created by the bolt torque and compare it with the allowable shear stress for the casting. I think you will find that the failure is most likely to be the shear stress on the internal thread is too high for the material

desertfox Mechanical Dec 28, 20025,549 Hi bugbus My comment about friction relates to the slippage of the girders in that how one would oversize the bolt holes without considering the friction generated with the bolts hand tightened. Also when the girders slip they will do so until the are...

Hi bugbus My comment about friction relates to the slippage of the girders in that how one would oversize the bolt holes without considering the friction generated with the bolts hand tightened. Also when the girders slip they will do so until the are stopped physically by the edge of the bolt...

Hello bugbus Like othersI don’t fully understand the reason for that the assembly sequence but I am curious about how you would ensure how all the bolts are not in contact with any of the mating steelwork (around the bolt holes) even if the bolts aren’t fully pretensioned. My other question...

Over time the modulus of elasticity of a spring will degrade due to environmental,mechanical, temperature and alternating loads, have a look at this article...

Hi noobokgbp Thanks for the illustration, okay the problems you need to sort out are:- If using an interference fit then you need to check the linear coefficient of expansion for both the threaded insert and the material the insert is mating with, because if there is any temperature rise...

Hi noobokgbp Right so your first task is to decide how to secure the insert, if by interference fit the interference should be such to prevent the insert coming loose under normal load conditions. Can you provide some drawings or sketches of the problem? Currently none of here can see the...

Hi noobokgbp So how do you intend to fix these inserts into the existing hole? Thread, force fit or ???. Depending on how you retain the insert will influence the calculations required.

Hi Firstly can I ask if you can provide a sketch or drawing of your situation and secondly you don’t say how the original tapped holes were damaged, was this due to external forces from the transmission? What grade of bolt are you using and what are the mechanical properties of this iron and how...

Hi rb1957 I did it graphically, I assumed a torque on link(A) and knowing that the force in link(C) has to be parallel to the link I calculated the force on link(C) at the intersection of the links (A)& (C). Now the force at both ends of link (C) must be opposite and equal and so from that...

Hi rb1957 Thanks for your positive comment. I had a go at solving the posters problem by finding the parallel force in the two bar link and then just using that force to obtain the torque about the longest link. My estimate for percentage torque output was around 1.28 so very similar to the...

Hi Here is a link to a similar problem to yours, the only difference is that they apply an external force to hold the mechanism in place and assuming you know the torque to the driver lever you can apply the same methodology. https://www.youtube.com/watch?v=mE80W4n-SiM “Do not worry about your...

Hi Everyone Thanks for all your help, I will rest easy😀👍. Tomfh, I have no idea when it appeared, I only noticed it today when I was leaving the house, it looked at first like someone had drawn a black line with a biro pen. “Do not worry about your problems with mathematics, I assure you mine...

Hi franhd Any chance you can provide a sketch of the configuration? “Do not worry about your problems with mathematics, I assure you mine are far greater.” Albert Einstein