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Recent content by gersen

  1. gersen

    hydraulic circuit

    Where is your problem?
  2. gersen

    Hydraulic Cylinder Seal Configuration Back to Back Leaks

    Firt it must be said that with moving idraulic seals there is always an oil film covering the surfaces to prevent damage on the seals. Not having a guiding surface is not so good, I will advise to use a seal of this type https://www.mcmaster.com/1386n19 with the addition of a wear ring...
  3. gersen

    Design Calculation Tip

    Yes I forgot the pi
  4. gersen

    Material deformation

    They just inform me of the process they use: - first milling of the outside dimension 643x743x1210 - turning of bore to Ø500-0.3 (simmetrical part) - finishing of the outside with milling and drilling - finishing of bore to Ø500+0.1 I think the removing of a lot of material on the outside after...
  5. gersen

    Design Calculation Tip

    I need some advise with a calculation. I have 2 round components fixed with a threaded bush. I want to find a good width for the H dimension. Do you think Checking the stresses as S = F / (π*D*H) can give a good results or do you have some better calculation method? Thank you The same applies...
  6. gersen

    Material deformation

    Hello at work we had a problem with some pieces. We made 4 pieces like the picture below using a oxycutted plate th. 650 mm material 1.0577. We machined a hole Ø500 +0.1, but after few weeks the hole has an eccentricity of 1 mm. Can the cause of this be residual stresses inside the material...
  7. gersen

    Force calculation

    If the cylinder isn't moving there can be very high bending moments. Not unusual that the clients require cylinder with few Tons of lateral load on the extended rod.
  8. gersen

    Force calculation

    It is not a school problem, it was my curiosity just to know if there is a bending moments but now I know I was looking at it the wrong way. The rod has only axial load because of the hinges. I am quite rusted on these kind of thinks.
  9. gersen

    Force calculation

    To be more clear this is my situation. I need to know if there is bending moment on the rod of the hydraulic cylinder. I don't know the load, only that I need 1700 KN to lift it.
  10. gersen

    Force calculation

    Hello, I'm struggling with a force problem. I have a system where a mass P, connected to rod od variable length L. The mass is guided to move on the circumference 31500 mm. To lift the mass I apply a force of 1700 KN on the same direction of the rod. What I need to find is the force componet...
  11. gersen

    Screw failure causes

    To answer yout question: the screws were new off-the-shelf, we remove the hex bolts and changed them with socket head cap screws. These weren't subjected to fatigue, after the bolting up, with a pneumatic tool, the cylinder received a simple test under pressure, one chamber and the other. During...
  12. gersen

    Screw failure causes

    My bad, the flanges are the head of some hydraulic cylinder they repaired so they are subjected to cyclical load during work. The screws were new new, the cylinders arrived with hex head screws. Wie use quite a lot of scews from M3 to M56. We have few different supplier all hardware wholesaler...
  13. gersen

    Screw failure causes

    I am aware of this problem an I'm trying tomake changes. It is difficult to change things in a 35 years old workshop, you wouldn't imagine the things I see... Reviewing the process of bolting up, I'm pretty sure they used the right setting with the right torque. The flanges were also tested...
  14. gersen

    Screw failure causes

    Here more informations: Total Number of screws used: 96 Number of screws from supplier A: 59 - damaged 0 Number of screws from supplier B: 37 - damaged 21 they bolted up using a pneumatic tool. I don't know for sure the torque used, because the man who bolted-up had little experiece and he...
  15. gersen

    Screw failure causes

    Maybe is something like this because they used screws from 2 supplier and all the damaged one are from the same one.
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