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  • Users: umatrix
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  1. umatrix

    Perpendicularty to common datums

    Hi, I have a bores that has two features that serve as stops for the items that are press fit. There is a perpendicularity call out to datums A-B Is this simply stating that both of these features must be perpendicular to 0.15 to both datums A and B? Also will the tolerance zone for both...
  2. umatrix

    Wheel Bearing Hub Lateral circular run out

    I am looking for an example of how to perform a tolerance stack up to check the worst case circular lateral run out. I am only finding basic 1D stack examples , or 2D gap analysis type problems. Hoping someone could point me to a few good resources. I have paged through Bryan R. FISCHER...
  3. umatrix

    Radial Run Out Stack up

    I have a roller bearing, the cup and cone have a circular runout tolerance. The hub that the shaft and bearing are inserted also have a circular run out tolerance. I am a trying to understand if the cup and cone tolerances will add/stack up and affect the hub run out?
  4. umatrix

    German Prints - No GD&T ?

    I've noticed that 2D prints from Germany (one that I have seen) do not have GD&T , is this common ? The print calls out this ISO 1101 spec, which is GD&T. Just not sure why symbols not shown on drawing. ISO 1101 Geometrical product specifications (GPS) — Geometrical tolerancing —...
  5. umatrix

    Bearing Tolerance - Radial, Axial and Tilt angle ?

    I have a rod/ shaft with a hall sensor that senses a magnet. I purchased a general bearing from Granger, mini ball Brg 626 6mm Bory Alloy Stl Item # 49DD56. The bearing seems to have excessive radial or tilt angle as shown in the image. The problem is the hall sensor is measuring the...
  6. umatrix

    Tolerance stack up types

    I’m almost always asked if I can perform a tolerance stack up analysis, and the answer is yes, a basic linear 1D, stack up. I have yet to see a 2D, 3D or a radial stack up calculation. Is it just a case of these being more complicated and difficult so designers rely on the 1D stack up making...
  7. umatrix

    Projects just dried up, like someone turned off hose

    This may belong in personal strategy section, but I wanted to hear from those in the auto industry. At current company work was steady, and then just stopped. I know it is not just me , but I can see it happening to our team as well. I am relatively new in my career and so far every company...
  8. umatrix

    Looking for basic FEA theory book with ANSYS focus ?

    Hi All, I am learning ANSYS workbench. I am looking to understand what is happening behind the scenes. Can anyone recommend a good book that covers the basics ? I would prefer not to get drowned in details but at least understand what the software is doing. Background 3D part is meshed...
  9. umatrix

    FMEA - DFMEA and PFMEA - nobody knows how it works

    I’m curious to see others experience with the FMEA process per AIAG, under the broad scope of the APQP process. I am under the impression that companies say they align with this to be compliant, however it’s has been my experience that the subject is often very misunderstood. What typically...
  10. umatrix

    Being Successful at an Unsuccessful Company

    I’m in the early stage of my career with about 3 years experience. (5 years if I count the internship while finishing my graduate studies.) Every company I’ve worked for( 3 in total) has been very dysfunctional. Here are the typical stages/ pattern each company has followed: 1. Current CEO...
  11. umatrix

    Specs on Print without date

    Hello engtips, I wanted to get the community's take on this. I have a print that calls out several specs, with no dates. Does this imply using the most current released spec or does the date of the print govern which spec release to use ? Thank you.
  12. umatrix

    Unilateral Tolerance vs MAX MIN

    Hello Eng-Tips, vs 21 max | 20 min I'm calling out the depth for a hole, is there any reason why I would use unilateral over max, min callout ? Thank you.
  13. umatrix

    Position tolerance relation to datum inside face of hole

    I have a part with three holes, with a diametric 1 mm positional tolerance defined at datum A, B, C for the two top holes. I am having difficulty seeing how the tolerance is applied to datum C , being the inside face of that hole? Datum A and B are clear to me, I.e., can vary diametrically 1mm...
  14. umatrix

    Engineering Change Notice ECN - Needed for subassembly Supplier change ?

    Hello eng-tips, We (Umatrix R US) manufacture and sell an item (shown below) that has two parts , part 1 we make, part 2 we get from a supplier. If either part changes , i.e., fit, form or function, we file an ECN. Pretty much no brainer for that. What about if the supplier (Motors Plus) that...
  15. umatrix

    eigenvalue buckling ansys , finding Stress

    Hello Eng Tips, I have computed the eigenvalue buckling analysis in Ansys. I have obtained the load multiplier and the deflection. How do I get the stress associated with this loading? Not the equivalent stress, but the bending stress associated with the buckling loading? Thank you.
  16. umatrix

    Cylindricity of Component

    Hi All, Conceptually, I understand, but not sure how to apply to check to see if my part is in spec. Individual measurements are falling out of the range provided, but the averages meet the print. I have a bushing, on the part the tolerance is given as 70.1 mm 69.9 mm GD&T is given here...
  17. umatrix

    New Role, how much do I assert myself in the beginning?

    I want to inquire from all those who have experience being in a new role. Background: Hired for new position, three days in, they might as well be talking in another language. Plus with COVID restrictions, working from home as a new employee is disorientating. I do not understand the company...
  18. umatrix

    Post your job status (2020 Edition)

    thread1088-246571 "Post your job status" from 2009 , ( Great Recession era ) This is the 2020 edition, (I.e., coronavirus related economic downturn ) Post whether you are working, laid off, or just plain downsized. Is job loss/lay off due to Covid ? If you're not working post how long you've...
  19. umatrix

    GD and T basics Course (Any one taken it?)

    Hello All, Has anyone had any experience with the courses offered at GDandTbasics.com, if so did you find it useful? Thanks
  20. umatrix

    Noise Testing dBA

    Hello Eng-Tips, I am testing a component in an anechoic chamber. The data is reported in dBA. First test results in a 55 dBA level Second test is 59 dBA My question is what is considered significant or noticeable with dBA? I understand that dBA is frequency weighted, but not sure how to...

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