Recent content by Laserxenon

Hot Rod, Agreed. After the exam I will do the calcs both ways and post to see what we find. Canwesteng, Firstly, thank you. 1) I actually was meaning when a bolt was loaded axially, not transversely. What you are saying makes sense for a shear / transverse situation, but imagine a flat...

Hot Rod, Oops! Luckily I do tend to calculate out even the obvious (or not) numbers so I don't make a stupid mistake just like that! Either way, it is about 77% of the area, so I still don't understand why we just call it good using the nominal diameter unless the threads do contribute to the...

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Hi Pete, thanks for your comment and good clarification. I was actually referring to the calculation for stiffness k= (A*E)/L where you are using the cross sectional area. Lindberg and others seem to use the nominal area, however, for example, for a 1" nominal fastener, the tensile area is...

Hello, I am preparing for the PE exam in 2 weeks and have some fundamental questions I would like to ask, starting with bolt stiffness. Many of these questions I know how to calculate, but I have been putting off understanding the "deeper" logic until now. Thanks in advance for your responses...

I am wanting to understand the difference between J & Ju. I understand that Ju is the unit polar moment of inertia and it must be multiplied by an area (throat for example) to calculate the stress at that point. I am good with the throat area derivation. The way I am thinking about it, if you...

3DDave, it was more that $125 and $175 are decent sums of money, not that either wouldn't be worth it drawoh, I am primarily picking it up for a reference book for the Mechanical PE exam and of course for potential use afterwards. HPost, where did you find this PDF? chicopee, the...

Hello, I am going to be purchasing either of the two mentioned editions of Marks to have for taking the Mechanical PE exam and later for my library. On Amazon I found the following commentary about the 12th edition: Though revised and added two new chapter [Applied Mechanics and Engineering...

Dgallup, Thanks for your reply. I played around with it as you suggested, and was able to find how I can assign the feature (hole for example) to be created at the part level- cool stuff. The one thing I couldn't find however was how to create an axis or datum and similarly assign it to the...

I sometimes am basing the placement of a feature in part "A" dependent on how things are coming together in assembly "ABC" which consists of Parts "A", "B" and "C". If i create say a axis or hole in assembly "ABC", how can i transfer or reassign that feature to part "A"? You can imagine that i...

Thanks jpankask, I'll look into that.

Hello All, I have a degree in M.E. and passed my EIT when I graduated college about five years ago. Since graduation, I have worked in technical sales as a sales engineer. In this capacity, I 1) do not work under a P.E. and 2)don't do work that satisfies my state's requirement for creative...

Thank you both for your thoughts

I am looking at my options regarding patent search including potentially filing a provisional patent or full patent. The online companies offer there services at roughly 1/3 the rate of a local patent attorney. Does anyone have experience using these services?

Thanks Aust! I'll give that a try and let you know.