Reporting Profile from only 1 or 2 axises

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

  • Reporting Profile from only 1 or 2 axises

    Have a callout "Profile of .007 to A" and another "Profile of .016 to A & B"
    How does one isolate only one or two datums when reporting in this situation?? Under Surface Profile in Pc-dmis we don't have the option to select where from. Please see attachment with snapshot of Drawing callout.

    Thanks a Million for help or feedback.
    Attached Files
    sigpicThanks a Millionth

  • #2
    I cannot exactly see your -A- datum so:
    Assuming -a- is 90 deg perp to -b- and -c- (roughly)
    1st Profile to -A- is controlling orientation and "form" only, of that surface.
    2nd is orientation and location (and form of that surface) to -a- and -b-.
    kb
    RFS Means Really Fussy Stuff

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

    Comment


    • #3
      Would you use Best Fit and restrain the freedom represented by the datum?
      Links to my utilities for PCDMIS

      Comment


      • #4
        I don't like to use BF unless forced (composite's - hole patterns, etc..)...
        But - yes, restrain DOF according to DRF. This is a qualification of the datum features exercise...
        Kev
        RFS Means Really Fussy Stuff

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

        Comment


        • #5
          If you dont use BF, then how are you going to allow DOF to change to accomodate the datum structure?

          Even when datums are not set, DOF are still fixed. Yes? Or, if you select Form Only in the Control Options, the DOF are allowed to adjust - and if they do, isnt that Best Fit?
          Links to my utilities for PCDMIS

          Comment


          • #6
            If you dont use BF, then how are you going to allow DOF to change to accomodate the datum structure?
            Let's define best fit. I am speaking as to a "best fit alignment". I am not totally understanding this question "allow DOF to change to accomodate the datum structure". DOF do not change. There are always 6. A planar feature will restrain 3 of those, as it is "un-bounded". Leveling a plane in this case will suffice as a primary DF.

            Even when datums are not set, DOF are still fixed. Yes?There are always 6. they are the same. There is a "machine alignment" from the CMM, is this what you are ref'ing to? Or, if you select Form Only in the Control Options, the DOF are allowed to adjust - and if they do, isnt that Best Fit?
            Form only report's the "form" of the set to known nominals (assigned). Again, the best fit i am ref'ing to is for initial inspection alignment, not an algorithm used for calculation purposes (i.e. cheby, lst sqs, etc...)
            kb
            RFS Means Really Fussy Stuff

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

            Comment


            • #7
              Let me try again...

              (I was referring to the Best Fit that is in the Profile tolerance window.)

              How does PCDMIS handle a profile tolerance with no referenced datum - only the tolerance band. Under the control options there is Form Only and Form and Location. Then there is Best Fit when you check Form Only.

              I think I did a crappy job of explaining my original question.
              Links to my utilities for PCDMIS

              Comment


              • #8
                Thanks ~ One more for clarification

                I do an alignment > Best Fit > Select only A and B (B = Feature Set surface).
                I then select surface profile, select B and enter my tolerance. This sounds good to me so far because it's only A & B in the mix.

                Sound good so far???? If so 2 more questions?
                1)Do I use weights in the alignment to favor A or leave alone?
                2)Now it's Form and Location or Form Only for the profile?

                Thanks for the Help
                Last edited by Gary Fitzgerald; 03-21-2007, 04:18 PM.
                sigpicThanks a Millionth

                Comment


                • #9
                  Originally posted by Gary Fitzgerald View Post
                  I do an alignment > Best Fit > Select only A and B (B = Feature Set surface).
                  I then select surface profile, select B and enter my tolerance. This sounds good to me so far because it's only A & B in the mix.

                  Sound good so far???? If so 2 more questions?
                  1)Do I use weights in the alignment to favor A or leave alone?
                  2)Now it's Form and Location or Form Only for the profile?

                  Thanks for the Help
                  for the .007 to -A- tol it should be Form Only.
                  for the .016 to -A- and -B- it should be Form and Location.
                  Lately, it occurs to me
                  What a long, strange trip it's been.

                  2017 R1 (Offline programming)

                  Comment


                  • #10
                    What about the weight Question

                    Use weights or not?
                    sigpicThanks a Millionth

                    Comment


                    • #11
                      Originally posted by Gary Fitzgerald View Post
                      Use weights or not?
                      If your results are very close but still out of tolerance then maybe weights will help.
                      But, I am not real familiar with using the bestfit routine that way.
                      Maybe someone else can chip in here.
                      Lately, it occurs to me
                      What a long, strange trip it's been.

                      2017 R1 (Offline programming)

                      Comment


                      • #12
                        Thanks John
                        sigpicThanks a Millionth

                        Comment

                        Related Topics

                        Collapse

                        • WolfMan
                          Profile callout
                          by WolfMan
                          Is this a Legit callout, to have a profile .020 (without any datum in the FCF)

                          and this Profile .020 -A- (where the callout is to the datum...
                          04-21-2015, 10:07 AM
                        • Peter Warcholyk
                          Profile Reporting
                          by Peter Warcholyk
                          Hello Folks,

                          I have a typical part with datum "A" (level), "B" (origin), and "C" (rotation).

                          ...
                          10-11-2006, 02:53 PM
                        • Ken8282
                          FCF for surface profile
                          by Ken8282
                          I have a call out for a surface profile with no datums. When I dimension it out using FCF I get form only. Do I have to be using datums to get form and...
                          12-21-2012, 03:15 PM
                        • Nguyen
                          Profile of plane
                          by Nguyen
                          I have to measure the profile of 825 nubs with respect to a datum plane. I pick a point on top of each nub then create a best fit plane go through all...
                          02-15-2008, 06:12 PM
                        • Wingman
                          Profile rules
                          by Wingman
                          Our company applies profile as such:
                          When there is no Datum Reference then we use profile to control form.
                          When there is a Datum Reference...
                          02-10-2009, 11:39 AM
                        Working...
                        X