Recent content by ksnar

Thanks, it's clear now.

Can someone explain if the nozzle thickness when connected to a flat plate acc. UG-45(b)(1) should have the thickness of the plate? Isn't a smaller nozzle thickness allowed?

There could be an effect of the holes being close to the edge of the material. I also spoke with a helicoil representative and he thought that the tensile of the AlSi7Mg-F material of 140 N/mm2 was very low, he suggested to take at least the T6 with tensile 220.

We are having great difficulties getting the tolerance right of M10 holes in cast aluminium plates with M10 thread inserts (make helicoil). Aluminium type "EN 1706 AC-AlSi7Mg-F" and EN 1706 AC-AlSi7Mg-T6" (F = as cast and T6 = solution treated and artificially aged). Quality of...

Abeltio, your post was most helpfull. Steven also helped me to pin down the problem to the increasing internal leakage.

Steven, It's a positive displacement pump. I'm familiar with the boundary layer theory and when I understand it correct, the flowrate will increase when the temperature increases because of the lower viscosity and less pressure loss. However our curve shows a higher flow rate at a give speed and...

It is normally done for leak tightness. For instance when thermal oil is used, the roller expanded joint will normally not be able to seal the tube-to-tubesheet joint of a heat exchanger. You could also check the TEMA RCB-7.521

How would the flow rate change (increase or decrease) when for a given pressure (28 bar) and speed (1500 rpm) the oil initially is cold and later temperature increases. Is it correct that the flow rate decreases when the temperature increases (viscosity drops)? If so, how can this be...

Breaux, I see the equation is the same. I've read the Euler document and K and mu are clear to me now. Thanks.

Yep, and thanks again. ksnar

gjb1, This discussion has taken me deeper into the matter as I anticipated, I appreciate all support. To understand you correct: do you mean that with friction co-efficient 0.4 you calculate that the pressure of the rod on the Al-plate is 137.5 MPa? For calculation of the boltforce, torque and...

Meanwhile I made some tests (calculations I made were including friction) and found different results. Reading vonlueke's remarks I realised that the rod indeed has a chamfer both on the treaded hole as the OD, which could be the cause of the different results. The aluminium we use is AlSi7Mg...

vtl: The aluminium sheet is approximately 15mm thick and the rod is made of plain carbon steel. Diameter of the rod is 18mm with center hole M10. Based on these dimensions I don't think that shear will be a problem, but thanks for the remark. If you don't agree I would appreciate your reply. ksnar

Thanks for the correction CoryPad, I took an old DIN description based on stress in kp/mm2. ksnar.

Thanks gjb1, it is as simple as that but I didn't see the clue. I've already made the calculation and it's looking good.