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  1. dthom0425

    Specifying ASME versions on drawings

    Hi all, Just curious what your experience is. The first note on my drawings tend to always be: 1) Interpret IAW ASME Y14.100-2017 and Interpret Dimensioning and Tolerancing IAW ASME Y14.5-2009 What if I were to leave off the 2017 and 2009 from these standards in the note? Would the drawing...
  2. dthom0425

    Figure 8-6 (Y14.5-2018) Explanation

    Hi all, Can someone please elaborate on Y14.5-2018 Figure 8-6 "Possible Results of Specifying Straightness per Unit Length RFS, With No Specified Total"? The previous figure 8-5 shows straightness per unit length at RFS (I believe this figure is also in Y14.5-2009). Where a composite...
  3. dthom0425

    Bounding Grms Evaluation

    Hi all, Apologies if this is posted elsewhere already. I can't share much details but my current design is able to withstand a random endurance vibration of 10 Grms for 2 hours. My customer is asking for us to increase to 50 Grms for 30 minutes. Can someone explain to me how I would go...
  4. dthom0425

    Position Refinement

    Hi all, Sorry if this question is embedded somewhere in this forum. I searched for a little while - not sure I got an answer to my question. If I have a fixed fastener situation and the threaded hole is controlled with position and refined via perpendicularity, which number tolerance (pos or...
  5. dthom0425

    Partial Datum - Area

    Hi all - see attached simplified model. I have a plate with some clearance holes used for mounting. The datum reference frame will be A|B where A is two partial areas as detailed. Datum feature B will be the pattern of 2X holes and all other features that I redacted from this model will be...
  6. dthom0425

    ABLESTIK 84-1LMIT

    Hi all, I've been put into a situation where I may need to use silver epoxy ABLESTIK 84-1LMIT (loctite) rather than tin-lead solder to conductively attach a through hole component into a printed circuit board. There's a long convoluted story here so I won't go through it but in general, I am...
  7. dthom0425

    Locating the center of a cylindrical optic

    Hi all, I have attached an image for my question. I have a cylindrical optical housing (red). It sits on a machined part which essentially mimics a V block (black). The red circle in the picture is not at all a feature on the machined part. I'm interested in controlling the location of the...
  8. dthom0425

    Aperture true position

    The optic in my example is square. Yes I agree the optic size dimensions, 1 x 1, are a feature of size. However, the clear aperture is just a zone within the 1 x1 square…much like that “mask from plate” example about from the standard. Guess I’m not sure how a positional tolerance can apply...
  9. dthom0425

    Aperture true position

    Thank you both. I was leaning towards the limited area indication that Burunduk shows from section 1 of Y14.5-2009. I guess my follow up question is..do I show the limited area with basic dimensions in size and location (from the edges of the optic)?
  10. dthom0425

    Aperture true position

    Hi all - I wanted to get your take on how you may go about GD&T of an optic/aperture. Let's assume I have a square optic/lens that is 1" x 1". It is too difficult to achieve a clear aperture over the entire 1x1 face so let's assume that the clear aperture must be centrally located in the 1 x 1...
  11. dthom0425

    Additive materials to resist water absorption

    Hi all - I'm looking to additively manufacture a part that will be submerged in water for an extended period of time. I'm curious if you have any recommendation in material selection? Thanks in advance
  12. dthom0425

    Curved feature as datum

    The primary curve is indeed a cylindrical radius. The part is not formed. The picture is misleading as it is heavily defeatured....the full detailed part is machined. Curious why the width of the part would be a datum feature? Functionally, the part is free to move within the clearance...
  13. dthom0425

    Curved feature as datum

    Hi all, Attached is a very simplified model of a curved part I have. The curved part mounts on a cylindrical surface, no separate alignment features other than the clearance holes in the part. I'm curious as to your thoughts on the best way to apply datums to this part. Functionally, I care...
  14. dthom0425

    Title Block and Use of "MAX"

    Awesome, thank you. I missed that section in Y14.5 - thanks for pointing it out.
  15. dthom0425

    Title Block and Use of "MAX"

    Hi all, I'm curious to hear your thoughts on how the use of MAX (or MIN for that matter) can be interpreted. Say we have a dimension on a drawing shown as R.125 (radius). No tolerance associated with the dimension other than the default title block of +/- .005 for 3 place dimensions. So as...
  16. dthom0425

    Clevis/Handle

    Hi all, See attached picture of representative part that I have. I'm curious of your thoughts. This is a weldment. The tube gets welded into the clevis ends and the clevis ends mount to a receiving joint via the two slotted openings at the bottom and pin (two pins, one for each side). I was...
  17. dthom0425

    Fixed Fastener without Projected Tol

    Hi all, I am attempting to use Y14.5-2009, Appendix B.5 "provision for tilting of the axis or center plane when projected tolerance zone is not used" formula to calculate the max shaft dia on my screw. The only problem is I'm getting an unexpected result. I may be choosing the wrong variables...
  18. dthom0425

    Title under ISO view

    Hi all - just a quick question. Is it mandatory per ASME standards to add a view title to an isometric view? I'm not seeing anything in Y14.3 that would indicate this is a requirement. Normally, on our drawings, I see ISOMETRIC VIEW FOR REFERENCE ONLY Just curious if there's an actual ASME...
  19. dthom0425

    Ti 6Al-4V on 6061-T6

    Hi all, I am in an aerospace application (sorry, can't share specifics) - the product I have will be cycling through hot and cold/various humidity over the course of its life. I'm curious if anyone has any experience with grade 5 Ti in conjunction with class 3 chem film on Aluminum. I see in...
  20. dthom0425

    Position without Datums

    I'm sorry - I forgot to attached the quick illustration.https://files.engineering.com/getfile.aspx?folder=ce67611d-b9be-415b-a3c9-acac59d4fa2e&file=illustration.jpg

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