OK, thanks for the clarification re: "complicated"
However, I'm still curious about Datum "B" - as I said, I just arbitrarily chose those 2 faces, I could've just as easily chosen the opposing 2 faces.
Also, I thought that the definition of the "3 Plane System" used in GD&T was 3 mutually...
Tunalover,
Thanks for the feedback, but what do you mean it "looks complicated?" What looks complicated? My GD&T? Is it overly complicated?
My main issue is the placement of the Datums - I just arbitrarily chose Datum "B" - I could've very easily chosen the other 2 opposing faces.
Why...
Tunalover,
Yes, it's made from scratch, as it has a specific tolerance needed to fit the hex hole on the other piece.
That being said, is what I've done in Figure 4 (my last attachment) on the right track? Also, any thoughts on the 2 questions I asked above?
Thank you,
Rob
drawoh,
Looks like we must've posted at around the same time!! heh...
Anyway, the "hole" you speak of is not a through hole, but is really 2 "dimples" - and what that means is that a punch is used to deform the material twice (one on one side, and the 2nd on the opposing side). What the...
OK, so I've done some more work on this, and came up w/ 2 other paths (see attached).
I was wondering if someone could please let me know which of the 3 paths (my 1st post being the 1st path, and this post being paths 2 & 3) is the correct one? If none are correct, could someone please set...
Howdy,
I am really at a loss as to how to GD&T a hex bar. In my research, I've found that it's classified as an "Irregular Feature of Size" and that most ppl tend to favor a profile tolerance.
Attached is what I've started, but I've hit a roadblock because I'm not even sure if I'm on the...
Pmarc,
OK, looks like it's finally starting to sink in now! I'm really appreciative of the information you & Belanger provided, as this type of "real life" scenario is something which most books & tutorials do not cover, and I feel that my task would be considered somewhat higher level GD&T...
Pmarc,
Yes, I have access to Y14.5, 2009. Looking at Fig 4-5 helps drive the point home that you & Belanger were trying to make. One other clarification regarding Fig 4-5, just to make sure I understand - to provide enough information to manufacture that part, there would need to be a...
Going back & re-reading Belanger's comment, as well as Pmarc's comment, I think I'm getting it now.
If I understand it, then I would need the profile tolerance for the perimeter of the part (the 2nd "X-Y" profile tolerance with respect to Datums "A" and "B").
Reason being, the profile...
Belanger,
OK, so I understand what you are saying now re: "The square will be wherever it will be. That is the "driver" for the tolerancing on this part. The position / location of the outer hex shape must be within .xxx from the vertical & horizontal edges of the square."
That being said...
Belanger,
Again, thank you for responding - your knowledge has been very helpful, as this is the first time I've had to perform the dimensioning on a part with such irregular geometry, having no real horizontal or vertical features to dimension from.
Anyway, I'm not sure I fully understand...
P.P.S. I was finalizing the drawing, and I realized that I also wasn't sure if the position dimensions for the square hole (the x & y dimensions to position it on the part) needed to be basic dimensions? Or, should they be set at some positional tolerance from something, and if so, then what...
Belanger,
Thank you very much for your reply (and "whew" - it's good to know I wasn't that far off base)!! heh
Anyway, the reason I was debating about Datum "C" is that, if the hole (Datum "B") would have been a circular hole, I still would've needed a 3rd Datum to control the rotation...
P.S. I must have attached the old picture, the one without the points for the profile. See the new attached picture, as it has the points "x" and "y" for where to apply the profile tolerance along the fastener cutout...
Howdy,
I'm trying to lay out the drawing details for a crowfoot wrench head (see attachment). Because I've always been taught that when choosing one's datums, the decision is based off of part functionality. Since this is a part of a tool, it will interface via the square hole with a ratchet...
