LMC dimensions

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  • LMC dimensions

    Can anyone give me an explanation of a LMC dimensions and why a bonus is added to it?

    Thanks,
    There is no such thing as a problem, only a challenge

  • #2
    It is opposite of MMC. As your feature of size departs MMC to LMC the difference is your additional tolerance. In a nut shell that is what it is. As far as why a bonus is added, you simply get additional tolerance. If you did not it would not be called LMC it would be called RFS but that is implied when no modifier is called out.

    Craig
    <internet bumper sticker goes here>

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    • #3
      Below is a link to a website that has several definitions of commonly used GD&T terms...

      http://www.engineersedge.com/gdt.htm
      sigpic
      Xcel 15-20-10 - PFXcel 7-6-5 - Merlin 11-11-7 - Romer Absolute 7525SI
      PCDMIS 2012
      Windows Office XP

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      • #4
        If you are new to GD&T, be sure to check out the "Engineering Calculators" on the website also...
        sigpic
        Xcel 15-20-10 - PFXcel 7-6-5 - Merlin 11-11-7 - Romer Absolute 7525SI
        PCDMIS 2012
        Windows Office XP

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        • #5
          The MMC, LMC and RFS concepts can be puzzling at first. Especially if you want to learn more about them from just the standards.

          There is a good book from James D. Meadows: Geometric Dimensioning and Tolerancing (ISBN 0-8247-9309-9). Taught me a lot.



          Jan.
          Last edited by Jan d.; 11-15-2006, 11:55 AM.
          ***************************
          PC-DMIS/NC 2010MR3; 15 December 2010; running on 18 machine tools.
          Romer Infinite; PC-DMIS 2010 MR3; 15 December 2010.

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          • #6
            LMC = Least Material Condition
            In a hole, the hole is at its high limit of tolerance.
            A stud, at the low limit of tolerance.

            Geometric Dimensioning & Tolerancing is used to more easily simulate function of a part. When using standard dimensioning some functional parts may be rejected.
            When in doubt, post code. A second set of eyes might see something you missed.
            sigpic

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            • #7
              The "Measurement of Geometric Tolerance's in Manufacturing" by James Meadows is a real good book also...
              Last edited by rangerboat72; 11-15-2006, 08:54 AM.
              sigpic
              Xcel 15-20-10 - PFXcel 7-6-5 - Merlin 11-11-7 - Romer Absolute 7525SI
              PCDMIS 2012
              Windows Office XP

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              • #8
                went to his classes

                Originally posted by rangerboat72 View Post
                The "Measurement of Geometric Tolerance's in Manufacturing" by James Meadows is a real good book also...
                Jame Medows is a very good teacher of GDT. He also has a web site.
                sigpicRegards,
                Donald Henger
                B&S Micro Excel Pfx
                3.5mr2 & 3.7mr3
                PHH10MQ, TP20 & TP2
                Country Rocks,But Bluegrass RULES!!!

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                • #9
                  Originally posted by Don Henger View Post
                  Jame Medows is a very good teacher of GDT. He also has a web site.

                  Same here . . .
                  sigpic
                  Xcel 15-20-10 - PFXcel 7-6-5 - Merlin 11-11-7 - Romer Absolute 7525SI
                  PCDMIS 2012
                  Windows Office XP

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                  • #10
                    Originally posted by Don Henger View Post
                    Jame Medows is a very good teacher of GDT. He also has a web site.

                    Quit playing on the forum and get busy learning something in that "Advanced PC-DEMON Class" the company is paying for...
                    sigpic
                    Xcel 15-20-10 - PFXcel 7-6-5 - Merlin 11-11-7 - Romer Absolute 7525SI
                    PCDMIS 2012
                    Windows Office XP

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                    • #11
                      Originally posted by rangerboat72 View Post
                      Quit playing on the forum and get busy learning something in that "Advanced PC-DEMON Class" the company is paying for...
                      Pot, Kettle, Black.

                      Get the picture?!
                      When in doubt, post code. A second set of eyes might see something you missed.
                      sigpic

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                      • #12
                        Originally posted by John Kingston View Post
                        Pot, Kettle, Black.

                        Get the picture?!
                        Good point John . . .

                        Just getting bored waitin' on parts to arrive. I've gotta give him a lil' SH** every now and again...
                        sigpic
                        Xcel 15-20-10 - PFXcel 7-6-5 - Merlin 11-11-7 - Romer Absolute 7525SI
                        PCDMIS 2012
                        Windows Office XP

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                        • #13
                          Are we getting better or worse? Post 10 is where we got off track this time. Mmmmmm stuff cooked in pots or kettles.

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                          • #14
                            Originally posted by Don Henger View Post
                            Jame Medows is a very good teacher of GDT. He also has a web site.

                            Hey Don,

                            I just wanted to let you know that you better be using 4.1 in class...

                            All of the PC's were upgraded to XP and only v4.1 has been installed. You better get busy getting accustomed to it because the incoming rack is over-flowing . . .
                            sigpic
                            Xcel 15-20-10 - PFXcel 7-6-5 - Merlin 11-11-7 - Romer Absolute 7525SI
                            PCDMIS 2012
                            Windows Office XP

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                            • #15
                              Hey,
                              another very good book is ASME Y14.5M-1994...
                              RFS Means Really Fussy Stuff

                              When all you have is a hammer - everything looks like a nail....
                              sigpic

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