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I want to connect the walls of a groove in the rotor with screws so that the size of the groove does not change during rotation. (The groove was machined by mistake). I want to make threaded holes in the groove and screw screws into them. The threaded holes are obtained with a cutout. Have you...

Hello. I am seeking information about does pod propulsion system (azipod) have dryer inside in order to reduce humidity so that the insulation of electric motor does not deteriorate. If it is installed there where dryers (heaters) are usually attached ?

Hello everyone. A bearing catalog says that it is important that a bearing is applied a required minimum radial load in order to work correctly. I have a vertical electric motor. Thrust bearing is installed at the top of the motor. My question is how to calculate what radial load is applied...

Thank you guys. Helped me a lot!

Hello Dear Engineers. I am designing a traction motor and have selected SKF NJ 2228 bearings for them. I am wondering what is the Bearing Limiting Speed and how to calculate it? SKF catalog says that limiting speed of the bearing is 4800 rpm. I think it is for oil lubrication. I'm wondering...

Thank a lot to everyone. The issue has been solved. I presented a FEA with a standart eye-bolt and showed similar area of stress above yield.

I used linear material, steel. I performed mesh convergence and I am sure about that. The mesh is second-order elements. The structure is lifted by 2 fabric slings pulled through the lifting lugs. And the most dangerous case is 90 degrees between slings is considered. As slings, I used the...

Hello Dear Experts. I have a construction with lifting lugs. FEA analysis showed an area with the stress in lifting lugs higher than yield strength. The area is shown in the picture below (red color). The lugs were tested in real-life successfully. But I need to write a conclusion for my FEA...

To Desertfox I mean that it does not influence on the area under the bolt head, but the bolt preload is needed for non-opening of the joint of the whole connection.(see a picture attached) To MJCronin I did not use ane washer bacause it increase self-loosening. And as for flanged headed bolts...

Hi Desertfox. It was mistake. m2 is right.

Hello everyone. I am designing a machine which has a bolt connection, and there is stress on one of the part under the bolt head, exceeding a yield strength. The stress is caused by bolt head preload pressure only, because external loads have no influence on the point of interest. The yield...

Sorry for misunderstanding. The picture above is not the motor i have talked. Its another one with plain bearing. The purpose of the picture is to show the whole unit and supports of the pump.

to FacEngrPE It is the new motor. So the data from some time ago doesnt exist.

dArsonval A pump.

FacEngrPE Hello. As I know 1-2 sec is not enough time to perform FFT analysis, isn't it?

Thank you for advices! I will measure the vibration during uncoupled coastdown.

Vibration vs time at full load. There are rolling bearings

Hello everyone. I am looking for a static coefficient of friction between two milled dry A 516-55 steel surfaces for calculating a threaded connection. I have found a table of friction coefficients in Nasa's Fasteners design manual (below). There two types of steel I can choose from. Which is...

Problem has been solved by repairing dirty geomerty.

mskds545, yes its because i've tried to create the mesh in various structures