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  1. mullins

    UNJC Threads into a UNC Tapped Hole

    Thanks for the responses. As far as I can tell, the UNJC stud should fit into the UNC Hole. If it doesn't I will defiantly post results on here. Taking the science out of rocket science...One step at a time.
  2. mullins

    UNJC Threads into a UNC Tapped Hole

    I have a drawing call out from the 1960s from a certain government agency which calls out a UNJC Stud and Self Locking Bolt, however the hole call out is for a UNC-3B Tapping. I am trying to assemble a list of Engineering Change Orders and I was wondering if anyone here had experience with...
  3. mullins

    Mass Properties Question

    Edit\Setup\Mass Properties Change your density to 0.0968 lbm/in**3. (www.matweb.com) Thats pretty close to what you have. Taking the science out of rocket science...One step at a time.
  4. mullins

    Locking mechanisms

    Loctite. (www.loctite.com) Apply a little to the male threads and bolt it down. Taking the science out of rocket science...One step at a time.
  5. mullins

    more on tapping aluminum

    If you dig around on the net, you can calculate the thread engagement area which you need for an aluminum body and a steel bolt. This will show you that for a softer female body, you will need less depth with a course thread. So if you are going to use a UN thread, I would suggest a 3/8"-16...
  6. mullins

    FE Model of a cockpit door window

    I agree with rb1957. Glass is technically a liquid in the molecular level; meaning that it does not have an ordered molecular structure. So including in a FEA model can work out to be a nightmare. Taking the science out of rocket science...One step at a time.
  7. mullins

    significant figures

    In a word. No. Tolerances should not be held to significant figures, they should be held within the accuracy bounds which are needed. If you need three digit accuracy, and put only two digits, then the machinist will give you a part with two digit accuracy. Conversely, if you give him (or...
  8. mullins

    Apple Install of ProEngineer

    I have recently joined the dark side and purchased an Apple. I still have my CAD Machine, but I was wondering if it was possible to install ProE on an Apple. Has anyone tried this and had some luck with it? Taking the science out of rocket science...One step at a time.
  9. mullins

    Ergonomics For Handle Design

    It depends on who you want to have turn the handle. If designing something for a child, I would go closer to the 5 lbf, but for an adult 10 lbf should suffice. Keep in mind which axis you are rotating the handle. 10 lbf rotation is not too bad if you are rotating the handle about the...
  10. mullins

    Symmetry Bolt

    I've seen them and played around with them a little bit, but I could not find anything to actually put them to use. The bolts I had used UNC RH Threads and UNF LH Threads. I guess I should state, that they made an interesting conversation piece when they were on my desk. That was about it...
  11. mullins

    Round Threads

    Granted I have little experience with composites, as well as the material being discussed is currently proprietary. I can say that it is no a glass based composite and the reason which a sealed plug in not being used is because the material has a limited lifespan and we are trying to minimize...
  12. mullins

    Round Threads

    I am working with a weak composite where I have to drill a hole and tap it. From there I have to make a plug from the same material to fill the hole. Due to how brittle the material is I cannot use a standard UNC thread. I have looked into using ACME threads but my manager suggests a round...
  13. mullins

    Frontal area and Coefficient of drag questions

    Unfortunately, automobiles are complex. The flow field for a car is in incompressible flow unlike an airplane. Since you are so close to the ground, you also have to deal with ground effects. Defiantly a CFD problem that would not be too much fun.
  14. mullins

    CNC Millers

    I have been using as HAAS shop to do all of my project work and when I was in school we used HAAS machines. I have not had any problems with either set up. Really either machine brand will function, it is just a decision based upon economics. See if you can get the MTBF of the different parts...
  15. mullins

    Heat Flux Based Upon Measured Temperatures

    I have a combustion chamber where 26 thermocouples have been attached to measure the temperature of the inside wall of the chamber. I know the material properties and I was wondering if there was a way to determine the heat flux through the combustion chamber wall as a function of time since...
  16. mullins

    Double nutting?

    Jam nuts are cheaper than nylocs. The only cases where I have had to use double nutted bolts is when they are going to subjected to intense vibration loads for an extended amount of time. For this use, I was able to use special bolts where they had UNC Right hand threads and UNF Left hand...
  17. mullins

    Machining aluminum

    In all of this, I never saw a step depth. You cannot just jump all the way down without expecting to break tools left and right. I suggest googling ME Consultant. It is a free program where you can set your material and cutter and determine what your feeds and speeds should be. Thats what...
  18. mullins

    Assembly Questions

    There are two different methods of doing this. The first method is the static method, there will be the allow assumptions check box. However I think you might be connecting through mechanisms where all joints are allowed to move. If that is the case then you have the part fully constrained...

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