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  1. desertfox

    Min/Max Roll Gap Drift in Danieli Pinch Rolls (Wire Rod Mill) – Need Troubleshooting Advice

    Hi there Have you or anyone from your company contacted Daneili?
  2. desertfox

    Acceptance limits for corrosion on threads during overhaul

    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...
  3. desertfox

    Help. Screw preload problem with sandwiched parts

    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...
  4. desertfox

    Spring Stiffness Recovery after a pause in cyclic loading

    Hi Is it possible the spring wire has work hardened ?
  5. desertfox

    Help specifying bolts for a hydraulic manifold flat seal face

    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...
  6. desertfox

    Thread Failure in Aluminum Casting

    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
  7. desertfox

    Bolt capacity in hand-tightened condition

    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...
  8. desertfox

    Bolt capacity in hand-tightened condition

    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...
  9. desertfox

    Bolt capacity in hand-tightened condition

    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...
  10. desertfox

    Spring sag

    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...
  11. desertfox

    Design of Threaded Insert

    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...
  12. desertfox

    Design of Threaded Insert

    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...
  13. desertfox

    Design of Threaded Insert

    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.
  14. desertfox

    Design of Threaded Insert

    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...
  15. desertfox

    Three Link Force Calc

    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...
  16. desertfox

    Three Link Force Calc

    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...
  17. desertfox

    Three Link Force Calc

    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...
  18. desertfox

    Brick work crack

    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...
  19. desertfox

    Standards on filling holes with weld

    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
  20. desertfox

    Brick work crack

    Hi PhamENG Yes I will make sure I have my eye on the mortar 👍 “Do not worry about your problems with mathematics, I assure you mine are far greater.” Albert Einstein

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