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  • Users: gersen
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  1. 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...
  2. 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...
  3. 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...
  4. gersen

    Screw failure causes

    Hello, recently I had the a problem with a bolted flange. After a repair some of the screw head pop out (see the picture below). Is it possible that the failure is due to a too high torque during bolting-up? All the damaged screw broke at the base of the head. The screw are Socket Head Cap M24...
  5. gersen

    Thread resistance reference

    Hi, I'd like to make my calculation sheet more formal. Some one has a reference for the calculation of non-standard-thread resistance? I use some basic formulas but I don't have a reference of some norms, textbook,... Thank you
  6. gersen

    Pneumatic problem

    Hi, I have a problem with one of my project: I'm building a movable cover for my machine, see image below. I want to move this with a pnematic cylinder. The cover is normally opened and the cylinder need to push it colsed. The problem is that when I give pressure, the cover close way too fast, I...
  7. gersen

    Help identifying coating

    Hi, sometimes I see hydraulic cylinders with this bronze-like coating: Anyone knows what kind of coating/tratement is this?
  8. gersen

    Hydraulic cylinder emptying

    Hi, I need some help with my problem: I have an hydraulic cylinder filled with a volume V of oil. I apply a force F on the piston to push the oil throuh a hole d. How can I calculate the time for the cylinder to be empty? Thank you

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