MMC on slot TP

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  • MMC on slot TP

    3.7 MR3

    I see the bonus for WF and LF but not in TP bonus any help?
    TIA

    Thomas(not a POLL)

  • #2
    Report it twice
    one direction using wf
    and one direction using lf
    may have to play with tolerance to update
    change it ,change back etc..
    3.5 mr2
    DR Watson shut me down again !!!! :mad: Smoke break:eek:

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    • #3
      Originally posted by Thomas Phillips
      3.7 MR3

      I see the bonus for WF and LF but not in TP bonus any help?
      TIA

      Thomas(not a POLL)

      I also noticed that w/3.7mr2 ? ? ? It gave me bonus tolerance for the DF, but not the LF ? ? ?

      I just created a "generic slot" using the variables from the measured slot for location and swapped the length & width. I was hoping that was just a temporary solution until' I upgraded to mr3. But I GUESS NOT ! ! ! Maybe it will work correctly in 4.0 ? ? ?
      Last edited by rangerboat72; 03-15-2006, 11:28 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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      • #4
        I have gotten in the habit of using RFS on all my TP dimensions, then using variables to calculate the bonus. I put in a comment just before the dimension stating what the bonus is for the size, then add the bonus to the TP tolerance using the variables.

        AND, for a slot, you DO need 2 different TP dimensions since the width bonus will be different from the length bonus. It is a feature of 2 sizes so it needs 2 TP dimensions.
        sigpic
        Originally posted by AndersI
        I've got one from September 2006 (bug ticket) which has finally been fixed in 2013.

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        • #5
          The big question is ...are you allowed bonus from length AND width? I generally only use the working part of the slot which is the width.
          James Temmen

          There is no job so simple that it can't be done wrong.

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          • #6
            IF you are allowed MMC, then the length of slot bonus applies to the axis the length of slot is in and the width of slot bonus applies to the axis the width is in. You can't add them together and use them in a combined fashion. That is why any slot really needs 2 TP dimensions.
            sigpic
            Originally posted by AndersI
            I've got one from September 2006 (bug ticket) which has finally been fixed in 2013.

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            • #7
              I agree with Matt I always use 2 TP dims when doing a slot
              sigpic
              if you had soap on a rope it would be tied to yer ankle

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              • #8
                12 slots TP + composite TP = 24 * 2 TP location = 48 * 30pc cap. study, dang

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                • #9
                  DOH! Gravy time....
                  RFS Means Really Fussy Stuff

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

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                  • #10
                    I am all over that-yeah, I just need some cheese to go with all the whine, the report will need to be explained.

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                    • #11
                      TP SHOULD NOT EVER BE USED FOR SPC CALCULATIONS!!!!!
                      Sorry for yelling, but TP does NOT take into account DIRECTION of deviation so you do NOT know how much variation you really have.
                      Use this as an example for whom ever wants this TP SPC:
                      Nominal location = X0 Y0 (just 2, lets keep it simple) with a TP tolerance of 2.0
                      Part #1 checks X-1.0 Y0 = TP 2.0 (in tolerance)
                      Part #2 checks X1.0 Y0 = TP 2.0 (in tolerance)
                      Part #3 checks X0 Y1.0 = TP 2.0 (in tolerance)
                      Part #4 checks X0 y-1.0 = TP 2.0 (in tolerance)

                      TP Variation = 0.00mm Pp/Cp is through the roof! It can not be calculated due to no variation. It will show a value of 999999999999+. That's one heck of a great part, based on TP. Ppk/Cpk also can not be calculated because there will be std dev of ZERO.

                      X axis variation = 2.0mm with a tolerance band width of 2.0mm
                      Y axis variation = 2.0mm with a tolerance band width of 2.0mm
                      Pp/Cp will look like garbage due to the variation using the entire tolerance band, no way will this thing pass SPC.

                      NOW, which one is right? NOT the TP.
                      sigpic
                      Originally posted by AndersI
                      I've got one from September 2006 (bug ticket) which has finally been fixed in 2013.

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                      • #12
                        Matt, I agree totally...

                        Originally posted by Matthew D. Hoedeman
                        I have gotten in the habit of using RFS on all my TP dimensions, then using variables to calculate the bonus. I put in a comment just before the dimension stating what the bonus is for the size, then add the bonus to the TP tolerance using the variables.

                        AND, for a slot, you DO need 2 different TP dimensions since the width bonus will be different from the length bonus. It is a feature of 2 sizes so it needs 2 TP dimensions.

                        Matt you are right on top of it!

                        That's exactly the way we've been doing it here for ten years that I know of. I hate it when those DARN DESIGNERS put the diametrical symbol int the feature control frame. Don't they realize they are implying a round tolerance zone for a feature that is actually rectangular (unless it is a rounded slot, but the same zone would apply)...

                        And I'll have to agree totally with you on the SPC calculations as well.

                        MATT, YOU THE MAN !
                        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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