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About J_MEC

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  1. What to do with my EIT now?

    NCEES only created the software PE exam in April 2013, and in April 2017 there were 15 test takers and 5 of them were repeat takers. I would have to imagine with so few software PEs out there that if you explain to a state board your scenario. They will hopefully be reasonable and understand that there are probably less than 500 software PEs in the country right now and it is difficult to get experience working under one. I mean after all, how did the first ever PE get his license if he had no PEs to work under?
  2. Need help with a simple hinge mechanism.

    Have you looked at SouthCo hinges? They make a lot of different style hinges. I have one of their catalogs and have used some of their latches on previous designs I have worked on. They make a lot of neat stuff. https://www.southco.com/en-us/product/hierarchy.html?hid=7347 Check out their website, there may be something off the shelf that fits your application.
  3. Can some one point me in the right direction?

    Have you thought about using a commercially available gearbox from some place like McMaster or Boston Gear instead of desiging your own?
  4. North Carolina is Out!

    I still do not have my license. I have been in contact with the people at the board. I have had multiple issues with my paperwork either being lost (in the mail or at the board office, I will never know for sure) and my references not filling out the paperwork properly. They have contacted me by email each time explaining the issue, but it can take 3-4 weeks for me to hear a response. One of my references was the 3rd PE and after I asked him to send in a reference form a 3rd time (first it was lost, second he didnt sign it, only put his seal on it) he got upset with me/the process and made a big deal/gave me grief about sending a form off a third time so I had to find a new reference. I ended up having a tough time finding a third PE since I work in manufacturing/product development and only knew 3 PEs since it isn't very common in my industry. After much searching/networking I found an Alumni who recently got licensed and he mailed his reference form off about a week and a half ago, so I am playing the waiting game again. It is especially frustrating since finding references and how my references fill out the forms is not something completely within my control. I am going on roughly 12 weeks since I mailed in my original application after I found out I passed and am starting to run out of patience.
  5. 6-minute Solutions, Problem 48

    The 2pi factor in the equation in the solution is to convert revolutions to radians. P_lat is given to you as 750 lbf. You do not need to know the journal length to solve this problem. Equation 54-33 has P as power, not as pressure.
  6. North Carolina is Out!

    Still waiting over here. Have you tried contacting them?
  7. Thermal Strain in Two Plates Held by Bolt

    I think you might be getting a little hung up on the wording in the explanation. I will try to give a different perspective. The unconstrained thermal expansion of the members is greater than the unconstrained thermal expansion of the bolt because one of the members is aluminum and has a higher coefficient of thermal expansion than the steel bolt. This causes a force on the bolt since the members get bigger than the bolt and they are clamped together by the bolt. Since the members are clamped the bolt has to stretch more than it's own thermal expansion. I drew out a simple diagram for you of the unconstrained thermal expansion of the bolt and each member (see attached). The difference between the thermal expansion of the bolt and the thermal expansion of the members is the change in length of the bolt that causes a thermal strain. That thermal strain can be used to calculate the force in the bolt. If both members had been steel, all the members and the bolt would have the same coefficient of thermal expansion and there would be no thermal strain. If the bolt had been aluminum instead of steel, it would have expanded more than the members and there would also be no thermal strain. Hopefully I am making sense, but I don't think there is anything wrong numerically. How they got there and explanation may be a little confusing, but in my opinion the end result is correct.
  8. North Carolina is Out!

    They cashed my check. I have been having issues with my reference's forms getting lost and filled out incorrectly. I really hope I got it all sorted out this week.
  9. MD&M Topics

    The management science chapter and engineering economic analysis chapters in the MERM should be enough to get you prepared for the exam. If you have time, I would cover some thermal/fluids stuff. I reviewed the following sections listed at the end of this post in the MERM and by review I mean did the practice problems in the MERM companion problems book. I did skip a few problems in the Fluid Dynamics and hydraulic chapters, but the rest listed did not have that many problems. I took the MD&M exam this past April 2017 administration, and although it is not a breadth exam anymore I am glad I reviewed these sections based on my experience taking the exam. I am also glad to say that I didn't review anything beyond what I listed below (the more in depth thermo/heat transfer/vapor power cylces I definitely wouldn't spend time on). The other thing to consider is that if you do the new 2016 NCEES practice MD&M practice exam, you'll notice that there is one, albeit simple, heat exchanger problem and one pump similarity question. Not a large percentage which is why I suggest you only study the topics below if you have time. Topic II: Fluids Fluid Properties Fluid Statics Fluid Flow Parameters Fluid Dynamics Hydraulic Machines & Fluid Distribution Hydraulic & Pneumatic Systems Topic III: Thermodynamics Inorganic Chemistry Energy, Work & Power Topic V: Heat Transfer Fundamental Heat Transfer
  10. I do not think you can say that in general ductile materials have the same compression and tensile yield strengths. Some magnesium alloys are generally considered ductile materials but do not have the same yield strength in tension and compression. I would say that in the case of this problem that the aluminum can be considered a ductile material with the same yield strength in tension and compression. Hopefully that answers your question.
  11. North Carolina is Out!

    I ended up calling the board and the lady on the phone was super helpful. Turns out they are only missing one of my references, not all 5 like the e-mail I had. They also have my transcripts. I think this is the worst part about decoupling, having to deal with all the application stuff after the exam.
  12. North Carolina is Out!

    I just got another e-mail from the state board saying they still didn't have my transcripts or references and I requested them a SECOND time and know that everyone mailed everything in a second time. I even had my transcripts mailed to my house at the same time I requested them be mailed to the state board and I received both of them, so I don't know what the problem could be? I am not sure how to handle this. I am at the point I am thinking of calling them and asking if I can get the transcripts and references and then deliver them personally? I am very frustrated and just came here to vent.
  13. Do I need more practice problems?

    I understand budget too, but imagine having to take the test again? You would have wished you spent the money on the books (which you can sell when you are done) instead of another exam registration fee.
  14. Do I need more practice problems?

    I thought I would give my feed back on the Six Minute Solutions: Mechanical Systems and Materials, 2nd Edition. I didn't think it was that bad. I did the MERM companion problems first, so I was more prepared than if I just went in cold. I think I averaged around 8-10 minutes on my first pass, but some of the questions take 15-20, some took me less than 2 minutes. I was under six minutes (average) on my second pass. The ones I got wrong on my first and second pass I worked a third time. I think some of the questions were harder than what you would see on the test, but a lot were pretty close to some of the more difficult questions on the exam. I tried also tried the Lindeburg Practice Exam and would say skip that if you really are trying to save money. I am also a fan of doing the NCEES practice exam closer to the end. I think if you do it first, it might make you skip some of the more difficult problems in the MERM companion, but those difficult problems really help you understand the material. I ended up taking a day off and simulated test day when I did it.
  15. North Carolina is Out!

    That is awesome. Looks like it doesn't take very long after they tell you that they have your completed application.