Align This

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  • Align This

    I like this one.
    It is a machined aluminum piece, approx 1 X 2 X 1.5 inches. Hollow.
    When I get it, it is still attached on the side so I have someting to hold on to.
    There are no datums specified.
    The only flat features are the mounting surface on the face and a small area on the bottom (green on the left and right view).
    The top has a surface at 16° to the face and a small hole that is dimensioned to the face and bottom surfaces.
    Clear?
    I plan to level to the face, rotate to a couple points or a line on the bottom and then translate these features plus either the hole at the top or the hole at the back.
    For dimensioning the hole at the top I plan to use a pierce point to a plane at the top. Tolerance is ± .001.
    There are some other features to measure, but much looser tolerances.
    I am using an iges, and of course all axis need to be changed.
    Does all this sound plausible?
    Attached Files
    I like to get hammered on Friday night
    Sometimes I can’t wait
    So Monday’s alright

    Lyle Henderson

  • #2
    Originally posted by granpagus View Post
    There are no datums specified.
    I'd be asking someone to get the design engineer to get involved and assign some datums to the part features.

    Never ASSuME what the datums are. It'll only bite you in the butt later.
    Xcel & MicroVal Pfx & Global 37mr4 thru 2012mr1sp3
    Contura Calypso 5.4

    Lord, keep Your arm around my shoulder and Your hand over my mouth. Amen.

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    • #3
      What DWADE said.

      In my opinion that part is an excellent candidate for an iterative alignment.

      Bill

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      • #4
        When no datums are specified I align to the tightest toleranced features. I also explain to the engineer what I am doing and make sure he concurs that it is prudent.
        <internet bumper sticker goes here>

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        • #5
          Understanding the function of the part may help in your dicisionsns in aligining the part when datums are not present.
          Windows 7
          Pc-Dmis 2015
          Global Performance 7-10-7


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          • #6
            Originally posted by BSchwark View Post
            Understanding the function of the part may help in your dicisionsns in aligining the part when datums are not present.

            I agree, but that has come back to bite me as well. Like craiger, I usually use the tightest tolerance to align to, if the engineer is not available.
            sigpic Life is not a journey to the grave with the intention of arriving safely, but rather a skid in broadside, totally worn, proclaiming WOW What a ride!

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            • #7
              Pretty much what others said.........Looks like a bedpan.........
              sigpic.....Its called golf because all the other 4 letter words were taken

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              • #8
                Originally posted by bw_bob View Post
                Looks like a bedpan.........
                The pdf says it is a "rear enclosure"
                Xcel & MicroVal Pfx & Global 37mr4 thru 2012mr1sp3
                Contura Calypso 5.4

                Lord, keep Your arm around my shoulder and Your hand over my mouth. Amen.

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                • #9
                  Originally posted by dwade View Post
                  The pdf says it is a "rear enclosure"
                  Looks like a bedpan with a drain hole. Thats all i'm saying.......
                  sigpic.....Its called golf because all the other 4 letter words were taken

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                  • #10
                    Well a bedpan is sort of a Rear enclosure
                    sigpic
                    if you had soap on a rope it would be tied to yer ankle

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                    • #11
                      Very small bedpan.
                      All my decisions on this part are run by my favorite engineer (plays a great blues guitar). Well at least he's got something going for him.
                      And the cad is no help. Nominals don't match the drawing.
                      First try says one critical feature is way off. That will be fun to deal with when I get in.
                      Haven't tried iterative yet so maybe its about time. That is if I can find any (time)
                      And this isn't even one of our own designs
                      I like to get hammered on Friday night
                      Sometimes I can’t wait
                      So Monday’s alright

                      Lyle Henderson

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                      • #12
                        http://mud.mm-a2.yimg.com/image/2264967937We will never know what craiger thinks, until craiger thinks it.






                        G
                        sigpic

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