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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...

Yes I forgot the pi

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...

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...

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...

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.

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.

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.

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...

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...

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...

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...

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...

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

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...

I'm referring on the shear strenght of the thread. I find the shear area of the thread, calculate the stess in the area and check against the tensile strengh of the material. I'd like to know if there is an official source about how to calculate the shera strengh of the thread. We build...

I appreciate very much your help. I tried adding some pressure on the rod side and applying the flow regulation valve on the inlet. Now I have a good speed for 2/3 of the stroke but it greatly reduces at the end (when the air in the rod side is compressed). I now have to figure a way to reduce...

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

With the weight on the rear the center of mass works agaist the cylinder (see image below), the lid is normally open. No, I had this cylinder in stock so I only made sure its force was enough to lift the cover (Ø50 bore). My problem isn't the cylinder pushing force, but its speed. I thought...