accuarcy of a circle

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  • accuarcy of a circle

    i got a 4 circles all measured the same tolerences are .9449/.9454 the cmm is kicking it out at .9456 i manually check the part using an air gage it's telling me it's .9453 i also checked using dial bore it checked .9455
    _L/H_.9449_AGAIN_=FEAT/CIRCLE,RECT,IN,LEAST_SQR
    THEO/-1.127,0,1,1,0,0,0.9449
    ACTL/-1.1271,0,1.001,1,0,0,0.9457
    MEAS/CIRCLE,6,WORKPLANE
    HIT/BASIC,NORMAL,-1.127,0,0.4724,0,0.3580853,0.9336889,-1.127,0,0.4724,USE THEO = YES
    HIT/BASIC,NORMAL,-1.127,0.3632,0.6979,0,-0.7688166,0.6394693,-1.1272,0.3632,0.6979,USE THEO = YES
    HIT/BASIC,NORMAL,-1.127,0.4631,0.9059,0,-0.9799596,0.1991965,-1.1271,0.4631,0.9059,USE THEO = YES
    HIT/BASIC,NORMAL,-1.127,-0.0844,1.4648,0,0.178607,-0.9839205,-1.1271,-0.0844,1.4662,USE THEO = YES
    HIT/BASIC,NORMAL,-1.127,-0.47,0.9518,0,0.9947751,0.1020904,-1.1271,-0.4705,0.9517,USE THEO = YES
    HIT/BASIC,NORMAL,-1.127,-0.2605,0.6059,0,0.5513976,0.8342426,-1.127,-0.2603,0.6061,USE THEO = YES
    ENDMEAS/
    ************************************************** ***************************this is next one***************************_R/H_.9449_AGAIN_=FEAT/CIRCLE,RECT,IN,LEAST_SQR
    THEO/1.127,0,1,1,0,0,0.9449
    ACTL/1.1269,0.0002,1.0009,1,0,0,0.9457
    MEAS/CIRCLE,6,WORKPLANE
    HIT/BASIC,NORMAL,1.127,-0.1692,0.5589,0,0.3580853,0.9336889,1.1268,-0.169,0.5595,USE THEO = YES
    HIT/BASIC,NORMAL,1.127,0.3632,0.6979,0,-0.7688166,0.6394693,1.1268,0.3629,0.6976,USE THEO = YES
    HIT/BASIC,NORMAL,1.127,0.4631,0.9059,0,-0.9799596,0.1991965,1.1269,0.4635,0.9058,USE THEO = YES
    HIT/BASIC,NORMAL,1.127,-0.0844,1.4648,0,0.178607,-0.9839205,1.1269,-0.0845,1.466,USE THEO = YES
    HIT/BASIC,NORMAL,1.127,-0.47,0.9518,0,0.9947751,0.1020904,1.1269,-0.4703,0.9518,USE THEO = YES
    HIT/BASIC,NORMAL,1.127,-0.2605,0.6059,0,0.5513976,0.8342426,1.127,-0.2604,0.6063,USE THEO = YES
    ENDMEAS/

  • #2
    if an id try max insc....
    sigpic.....Its called golf because all the other 4 letter words were taken

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    • #3
      Originally posted by bw_bob View Post
      if an id try max insc....
      And many, many more hits.
      sigpic
      Global Advantage 12-22-10
      TESASTAR M SP25 4.3mr2

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      • #4
        I would try to take a few more hits, and use an uneven number say 9 or 13 to take out any lobing effect you might be getting
        If I have offended anyone with this post, I'd like to take this opportunity to say BOLLOCKS
        Dry your eyes Princess and man up.

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        • #5
          Are you talking about a .0003" difference?
          Using 3 very different types of tools you should expect to see differences.
          I bet that if you changed your start and end points on the circles you would see differences also.
          And at a .0003" difference, repeating measurement on the same hole with no changes can show some variation.
          Also, changing the depth will show differences.
          .0003" is not much.
          Lately, it occurs to me
          What a long, strange trip it's been.

          2017 R1 (Offline programming)

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          • #6
            Originally posted by Snaggy View Post
            I would try to take a few more hits, and use an uneven number say 9 or 13 to take out any lobing effect you might be getting
            +1K

            I did a study of the lobing of our TP20's - it definitely has an effect. Odd numbers seem to reduce this effect.
            sigpic
            Originally posted by Ironhoe
            I got something under my sporran for you, take care of it and you got my vote.

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            • #7
              Originally posted by Snaggy View Post
              I would try to take a few more hits, and use an uneven number say 9 or 13 to take out any lobing effect you might be getting
              unfortunally it is an inturupted circle with two .375 radius cuts 45 deg from c/l in both positive and negative direction

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              • #8
                Originally posted by John Riggins View Post
                Are you talking about a .0003" difference?
                Using 3 very different types of tools you should expect to see differences.
                I bet that if you changed your start and end points on the circles you would see differences also.
                And at a .0003" difference, repeating measurement on the same hole with no changes can show some variation.
                Also, changing the depth will show differences.
                .0003" is not much.

                Yep yep agree

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                • #9
                  Originally posted by John Riggins View Post
                  Are you talking about a .0003" difference?
                  Using 3 very different types of tools you should expect to see differences.
                  I bet that if you changed your start and end points on the circles you would see differences also.
                  And at a .0003" difference, repeating measurement on the same hole with no changes can show some variation.
                  Also, changing the depth will show differences.
                  .0003" is not much.
                  im using a brown and sharpe cmm 1 on the shop floor no enclosure next to a vertical maching center taking big cuts 3ft from our smog hog but we do have painted floors that are 8ft deep with concrete

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                  • #10
                    Originally posted by j.gonzalez View Post
                    im using a brown and sharpe cmm 1 on the shop floor no enclosure next to a vertical maching center taking big cuts 3ft from our smog hog but we do have painted floors that are 8ft deep with concrete
                    In that case my little fruit bat, you may as well stand on the roof and p1ss into a howling gale. You don't stand a chance mate
                    If I have offended anyone with this post, I'd like to take this opportunity to say BOLLOCKS
                    Dry your eyes Princess and man up.

                    Comment


                    • #11
                      Originally posted by Snaggy View Post
                      In that case my little fruit bat, you may as well stand on the roof and p1ss into a howling gale. You don't stand a chance mate
                      Now thats funny ! Don't ya love English humor and wit !
                      Jim Jewell

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                      • #12
                        Originally posted by Snaggy View Post
                        I would try to take a few more hits, and use an uneven number say 9 or 13 to take out any lobing effect you might be getting
                        Originally posted by Lab_ratt View Post
                        +1K

                        I did a study of the lobing of our TP20's - it definitely has an effect. Odd numbers seem to reduce this effect.


                        That's interesting to know...I'll have to try that.
                        ~Josh~ Giles Rescue "Ut ceteri vivant"

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                        • #13
                          Originally posted by Snaggy View Post
                          In that case my little fruit bat, you may as well stand on the roof and p1ss into a howling gale.
                          is this an enhancement
                          sigpic

                          It goes "dink" so it must be workin'

                          Bollocks

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                          • #14
                            Originally posted by jjewell View Post
                            Now thats funny ! Don't ya love English humor and wit !
                            Don't encourage him Jim - he'll keep coming back for more......
                            sigpic
                            Originally posted by Ironhoe
                            I got something under my sporran for you, take care of it and you got my vote.

                            Comment


                            • #15
                              Originally posted by bw_bob View Post
                              if an id try max insc....
                              +1

                              and +1 on the odd number points
                              and +1 on the more points
                              and +1 on the no chance in h3ll in an uncontrolled environment that you'll get better correlation than .0003"
                              Well you can if you have all your measuring equipment in that same area for more than a few hours, and don't check the part when comes straight out of the machine, and be sure the temperature has remained constant for a while.
                              Have you measured the ring gauge you're using with the CMM?
                              And maybe take a cylinder on the part and see what it shows.
                              Kami

                              sigpic

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