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Recent content by ecto1000

  1. ecto1000

    Stainless steel bolt head breakage

    Yes I considered it. But on other machines no issues with normal ones. In that specific application there is something for sure not yet understood or discovered....
  2. ecto1000

    Stainless steel bolt head breakage

    Yes, I know that. Adding more bolts is not an options since two are enough for this application, following CEMA too. Theoretically torque is constant, but as you said investigation about material and actual application is mandatory. But I keep thinking about the possibility of avoid tightening...
  3. ecto1000

    Stainless steel bolt head breakage

    Thanks to all for the great opinions. Should not be chlorine since we are in the food sector. Yeah ok, actually they have a soft start or inverter. Yes threads are only external to the shaft. Washers doesn't need to be curved since the holes are flattened. Radius under the head yes should be...
  4. ecto1000

    Stainless steel bolt head breakage

    It's wheat flour. Bolts are hex head cap. I attach a photo of the bolt body still installed, the washer was still there. The head was lost. In my idea I was thinking to avoid pre-loading the screw, since it must work as an elastic...
  5. ecto1000

    Stainless steel bolt head breakage

    The shaft belongs to a screw conveyor, temperature is constant, no shock loads at all, and yes it works 8h day with 10 starts inside this period, all working days of the week. I attach an example.https://files.engineering.com/getfile.aspx?folder=bb22391f-be8d-478d-9989-96e28aa36e4b&file=Cema.jpg
  6. ecto1000

    Stainless steel bolt head breakage

    Hello everyone, I have a problem to submit to the forum. It is a coupling of the driving shaft with driven shaft, made by 2-bolt coupling at 90°, shafts in Aisi 304. The drive shaft is solid and is inserted into the driven shaft (60 mm external diameter tube), which has flattened holes to...
  7. ecto1000

    NX NASTRAN mesh 3d

    Ok thanks a lot. But the difference between Femap and Nx Nastran isn't so clear to me. I've got Nx10, but not Femap. So I think I can't do the revolving mesh operation you described? Is Femap a separate software right?
  8. ecto1000

    NX NASTRAN mesh 3d

    Uao, good idea. Yes please upload everything. Thanks I will apply different combinations of axial load and torque.
  9. ecto1000

    NX NASTRAN mesh 3d

    Ok! I was more focused in Hexa since I remember that they work smarter. What do you suggest as procedure for them? Just for my learning. Thanks
  10. ecto1000

    NX NASTRAN mesh 3d

    Thank you very much for your suggestion. I will give it a try. But some questions are arising in my head. If, like in this case, I'm dealing with a prt made by two solids (or more), do I have to make one single solid out of the two ones, before meshing? Or is it not necessary? Which is the...
  11. ecto1000

    NX NASTRAN mesh 3d

    I see. Yes I could mesh the helix alone, but I mean, when it is in a separate 3d file, without the shaft. But I got your point. Anyway, I found the cause of my issue. I was working on a 3d coming from a .step file done by another person, I forgot to mention this, my fault sorry. So after...
  12. ecto1000

    NX NASTRAN mesh 3d

    So, in the same fem model, you're suggesting to 2d mesh firstly the shaft, and after that 2d mesh the propeller. Right? If I misunderstood please be patient and say to me in details [wink]
  13. ecto1000

    NX NASTRAN mesh 3d

    Hi everyone, I would like to perform a FEM with NX NASTRAN of this propeller on the shaft. The shaft is about 300 mm in Dia. while the propeller section is 50 x 150. My question is about 3d mesh. If I do it with just the helix (for another type of calculation) it works very well: first I do the...
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