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Recent content by adrag

  1. adrag

    Rod Bolt Stress

    I have a situation where I need to calculate the stress on a rod bolt. I have a 3/8-24 rod bolt which is torqued to achieve a bolt elongation of .006" as measured with a bolt stretch gauge. I have calculated the inertial load at the max rpm and I want to add that to the clamp load to get total...
  2. adrag

    Whats going on with Timken?

    Went to their online catalog to look up some needle bearings and it seems the entire section is missing. The online catalog is here: http://timken.dirxion.com/WebProject.asp?CodeId=7.0.9.2# It goes section A, B, D. Section C, which contained their needle bearings, is missing. I have a Timken...
  3. adrag

    head port size

    I used .5intake/rev because assuming it's a four stroke there is one intake event every two revolutions so intake/2rev or .5intake/rev. I see what you're doing though by calculating avg piston velocity and then using the ratio of bore to port csa. Is this the typical method to calculate port...
  4. adrag

    head port size

    Not to hijack but I have a question about that port velocity calculator on speedtalk. I ran the numbers they input and got a much lower port velocity. Isn't it just s=Q/A? So: Port Dia=1.500" Bore=4.00 Stroke=3.500 Rpm=5000 Port csa is (1.500^2)*PI/4 =1.767 in^2 Cyl volume=...
  5. adrag

    Needle bearing load calculation

    Mike, Are you referring to running two rows of needle bearings? Also, does anyone have the correct equation pls? Al
  6. adrag

    Needle bearing load calculation

    I posted a picture of the catalog. It is the static load rating equation. The rod will only swing though an angle of 35 degrees so which equation should I be using to calculate bearing load capacity...
  7. adrag

    Needle bearing load calculation

    I am trying to design a full compliment needle bearing for the wrist pin of a prototype two stroke engine. I'm using Timken's catalog located at: http://timken.dirxion.com/Main.asp On page C326, Timken gives bearing load rating equations for dynamic and static applications. I have put together...
  8. adrag

    Cylinder size limitation

    An IHRA pro stock engine with 5.75" stroke(146mm) and an 8500 rpm redline then dwarfs the F1 engine with 41.4 m/s.
  9. adrag

    How do I design this part?

    Thank you everybody. I think I see how to do it now. Mmauldin, I'm using NX5 and it looks like your part file is from a newer version. Al
  10. adrag

    How do I design this part?

    I'm trying to get to something like this.http://files.engineering.com/getfile.aspx?folder=89eeb1a1-f2d5-4f0c-badf-3862f49ca47d&file=port2.jpg
  11. adrag

    How do I design this part?

    Most of the design work I do is nice, easy flat surfaces so I'm a little lost here. How would I design something like this? It's an intake port that I want to make parametric. It starts off as a parallelogram but I want it to end in a circle. I made a guide line and used the swept feature while...
  12. adrag

    NX5 Assemblies: Tangent to swept feature

    Don't know what the best course of action would be here. I created a helix, then swept a rectangle along the guide using the "swept" feature to create the groove you see. I have an outer sleeve with a pin protruding and I want to make the guide tangent to the pin. I already have an "align"...
  13. adrag

    Looking for injector model

    Does anybody know of any good websites to download models for free? I need a fuel injector and a turbocharger. I was hoping to find something and insert it directly into my model so I wouldn't have to model them myself. Thanks Al
  14. adrag

    ACME thread vs. UNC threads

    If I remember correctly, some of the Chinese mini lathes use cut metric threads on their lead screws. It was strongly suggested to deburr it before running the lathe and then it supposedly lasts forever....or until something else breaks. Seems like an similar application to your but with...
  15. adrag

    NX Nastran 5.0

    When I run the solver, the dos window comes up then promptly closes. I opened the log file I found in the folder and the last few lines are: NX Nastran started Mon May 11 09:41:35 EDT 2009 09:41:35 Beginning Analysis All SSE XMM operations have been enabled. All MMX operations have been...
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