What is this on the drawing?

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • What is this on the drawing?

    Below by the 6A in red what is the M1 because it doesn't look like a traditional datum target, unless there stating they want all 3 holes at MMC of 1 MM? This print has been redrawn by customer multiple times and just trying to make sense of it? For datum D i just constructed a set out of all 3 six mm holes and defined the set as D.




    https://attachment.outlook.live.net/...animation=true

  • #2
    Try attaching the image again. I'm seeing nothing.
    Remembering my beautiful wife Taz who's life was taken from me on 6-13-2020. I love you and I miss you.

    Comment


    • #3
      Originally posted by A-machine-insp View Post
      Try attaching the image again. I'm seeing nothing.
      Should work now, I have had a back and forth with this customer on this part because how they want it dimensioned won't work, they call mostly everything out as basic, and I can't do a proper datum alignment with this thing if i do it just spins the cad model.
      Attached Files

      Comment


      • #4
        As per the print, D is only the particular hole where they mentioned as Datum D. You can see all the co-ordinates call-out based on that hole only.

        Comment


        • Schlag
          Schlag commented
          Editing a comment
          That is not how basic dimensions work. The feature control frame dictates the 0.00 location, not where the basic locations may be generated from.

      • #5
        I agree with TAMIL , I would set Datum D as the one hole the arrow is pointing to.
        Remembering my beautiful wife Taz who's life was taken from me on 6-13-2020. I love you and I miss you.

        Comment


        • Schlag
          Schlag commented
          Editing a comment
          It says 3X. Why would 1 hole be the datum ?

      • #6
        But what the print *says* is that the full three hole pattern is the datum (could constrain both location and rotation).
        AndersI
        SW support - Hexagon Metrology Nordic AB

        Comment


        • #7
          I agree with Andersl. ASME Y14.5 2009 FIG 4-26
          Last edited by JGRIFFIN; 09-03-2019, 08:56 AM.

          Comment


          • RandomJerk
            RandomJerk commented
            Editing a comment
            In the 1994 standard, Fig. 4-22, ΒΆ4.5.8

          • zoolander303
            zoolander303 commented
            Editing a comment
            thanks guys so should i set the origin at the constructed set of D? that's what i was going to do, so how do i rotate the set without spinning the cad model? When I try to align it just rotates on z like ten degrees or so, Also when I try calling out the D Material Modifier to B it doesn't work states I'm not perpindicular. I usually don't have issues but this just isn't working out even the distances from hole to hole isn't at the print dimensioned tolerance Im using the Z plus axis.

        • #8
          Addressing your original question about M1, to me it looks like it's the 1st change of Rev M on the print. If my guess is correct, you should have a list of changes in one of the upper corners of the print with a list of changes for M. The first in the list should reference a change to that callout.

          If your print isn't up to M, then I don't have another guess at the moment.
          PC-DMIS 2016.0 SP8

          Jeff

          Comment


          • KIRBSTER269
            KIRBSTER269 commented
            Editing a comment
            I'm with Schrock on this one. or relating to a Note, but leaning more toward Shrocks statement. A lot of people don't read the notes anymore. Ugg,... what's with all this reading

          • Quality ish
            Quality ish commented
            Editing a comment
            I've got a customer that used to be based in Germany. As a result, most of their older prints are first angle projection, the decimal places are commas, and the notes are all in German.

            To that end, I've mandated to the "powers that be" that I need access to the internet to go to a translator (such as Google translate) to see what the notes are calling out. It's not perfect, but it usually sets me on the right track.

        • #9
          M1 could be an internal AQL sampling or dimensional categorization of the feature, for MRB evaluation. At other employers, we had "Key" or "Critical" dimensions which had zero tolerance for MRB use-as-is dispo's, if even 0.000001 out of spec. Then, we had "Major" categorized dimensions, which mandated SPC data for lot acceptance, and another more lax categorization for MRB.

          My guess is this is a Major-categorized dimension.

          Comment


          • #10
            According to me (with my experience in working with castings in automobile industry), M1 is Mount 1 which will assemble with the next part. Hence that is base of assembly and so the rest of the dimensions are called out based on that hole.
            Last edited by TAMIL; 09-03-2019, 11:35 PM.

            Comment


            • zoolander303
              zoolander303 commented
              Editing a comment
              so i should set my origin at that hole? This ones been throwing me for a loop, example when I callout the two holes on the bottom flange to the hole where the arrow is pointing on D it comes up like a millimeter under what it should be and I am using a Zplus workplace.

          • #11
            May i know which are the A,B and C datums???
            Rotation takes main part in these type of issues.

            Comment


            • #12
              In a situation like you're in, I get on the phone with the engineers. If they can't answer it, they can contact the customer to find out the meaning of the notation.

              If nothing else, the customer SHOULD appreciate the fact that you're making every effort to approve conforming parts.

              (Unless the parts are already 3 weeks late. Then they're probably not going to call the customer, and just make something up... That's how engineers roll.)

              Comment


              • #13
                A is the top plane, B is the side flange I take as a plane, C is a line from what it looks like on the side of that flange. I tried rotating B but anything I rotate it spins my cad model like 5-10 degrees on z axis. I tried the traditional 3-2-1 manual alignment couldn't' get it to work.
                Attached Files

                Comment


                • TAMIL
                  TAMIL commented
                  Editing a comment
                  Then in this case you have to contact the engineers as Quality ish said.

              • #14
                Originally posted by zoolander303 View Post
                A is the top plane, B is the side flange I take as a plane, C is a line from what it looks like on the side of that flange. I tried rotating B but anything I rotate it spins my cad model like 5-10 degrees on z axis. I tried the traditional 3-2-1 manual alignment couldn't' get it to work.
                Okay thanks

                Comment


                • #15
                  https://www.pcdmisforum.com/filedata/fetch?id=457191&type=thumb

                  Construct a line between Planes A and B.

                  Align as follows: Level Z plane to the A datum (plane), rotate to line created between A/B, and originate to the point where A,B, and C intersect. Of course, if the bend is hinky, it'll throw the dims off, but it's the best I can offer off the top of my head.

                  I think in this way, you're not going to get the rotation you're talking about.
                  Last edited by Quality ish; 09-04-2019, 12:25 AM.

                  Comment


                  • zoolander303
                    zoolander303 commented
                    Editing a comment
                    What line should i construct a intersection, offset, best fit? Ill try it tomorrow as you stated a phone call with customer needs to happen wondering if you guys have these situations as well in your career?

                Related Topics

                Collapse

                Working...
                X