I am actually not very familiar with the "Indo-European" theories.
My interest actually lies in the history of milk in human dietary cuisine and the culture of dairy farming.
But I thought this sub may be able to offer insight as to when lactose tolerance actually first developed in human civilisation.
Hey folks,
I'm working on a problem involving thin walled stainless steel tubes, and was hoping someone has experienced something like this.
I'm working on an assembly with these misumi tubes (https://us.misumi-ec.com/vona2/detail/110302289460/) and they can't provide me with any ID tolerances beyond standards, and the standards are practically useless to rely on for the 0.5mm or 0.3mm wall thickness (+/- 0.2mm thickness)
Is it reasonable to order a bunch of these tubes, measuring the all the ID's, and getting our own tolerances? Has anyone done anything like this?
Say if I was looking at 2 components in an assembly and wanted to position them so that they're either flush or there is a gap. After a tolerance stack-up analysis of 5 key dimensions I can see the possible interference is between + 0.000, -0.060 (with a nominal gap of 0.030". So I know that even in the worst case the 2 parts are either flush or there is a 0.060" gap.
Can I use statistical tolerance analysis to assume that it's unlikely that all 5 key dimensions are in the worst case in reality, so I could model my assembly to have an interference of + 0.010, -0.050 (so a nominal gap of 0.020").
Is there a quick generic formula that can be applied as a rule of thumb if the actual distribution of statistical data is unknown, i.e. to SPC data is available?
I am very new to the world of tolerance stack up analysis and despite having read a lot about this topic online, I still have some questions. My biggest difficulty lies in defining correctly the direction of each of the dimensions in my chain - whether they are positive or negative.
Can anyone help me by providing some kind of simple example?
I’m looking into Tolerance Analysis Add-Ins for SolidWorks, and am curious to know what the general consensus is on which one is best and why. Any thoughts, comments, and experiences are more than welcome. Thanks!
I just started as a mechanical engineer for a local company. My boss wants to enroll me into a training course for GD&T since they dont have the times or resources to train me. They are willing to pay for a professional online course for me to take.
I am a recent graduate and never really learned about this. I work in an industry with extremely loose tolerances, but I am still looking to improve my knowledge in this area, rather than just add 20 thou to the hole dia.
Any recommendations on good free resources to learn and start applying this topic would be awesome.
Thanks.
I'm a roughly entry level mechanical engineer. I had a phone interview yesterday which was successful, despite my weak answers to questions about GD&T and tolerance stacks. I'm going for an in-person on Monday, and the hiring manager suggested I brush up on both topics by then.
Can anyone recommend some resources for getting a foundational understanding of tolerance analysis and GD&T? I won't be expected to be an expert by Monday, but I need to have a better handle on the purpose and execution of both.
I started by downloading ASME Y14.5-2009 for GD&T and I'm going through it now, but I'm not sure if this is the most efficient way.
I've used GD&T on drawings in past jobs, but I was mostly just told which symbols to use where by a more senior engineer. So it's less about learning what symbols mean and more when and how to use them. Tolerance analysis I might as well have never seen. I have no idea how to start there.
Any suggestions are appreciated, thank you.
Hello everybody.
I currently work as a Mechanical Design Engineer for an appliance company. I have identified that my tolerance analysis skills could use some refinement. Are there any online courses to take to help me get more proficient in this area?
I took a GD&T class a couple of years ago through a company called Applied Geometrics and it has been invaluable to my career so far. This company offers a tolerance stack up class but they do not have any scheduled tolerance stack-up courses on the calendar for the foreseeable future. I am looking for an online lecture based class like that but I am open to anything really.
I was wondering if anyone had a good tutorial that teaches tolerance stack up analysis. Preferably one that shows a good excel template and has practice problems.
