Scan: constructing circles from half-circle scans

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  • Scan: constructing circles from half-circle scans

    Hey fellows I scanned 2 half circles and then tried to create 1 - 360 degree scan from them and it seems to be fishy. Here is my code, Thanks and War Eagle.


    SCAN1 =FEAT/CIRCLE,CARTESIAN,IN,LEAST_SQR,NO
    THEO/<0,0.2585,0>,<0,-1,0>,3.746
    ACTL/<0,0.2585,0>,<0,-1,0>,3.746
    CONSTR/CIRCLE,BF,2D,SCN1B.HIT[1].XYZ,SCN1B.HIT[2..59].XYZ,SCN18B.HIT[1].XYZ,SCN18B.HIT[2..59].XYZ,,
    OUTLIER_REMOVAL/OFF,3
    FILTER/OFF,UPR=0
    Last edited by Josh Carpenter; 10-11-2017, 09:50 AM. Reason: Please put some thought into your thread title.
    sigpic

  • #2
    what are you trying to achieve doing this? the form of the two half circles as one? the position of the centre of the two half circles?

    Reason I ask is there are a few limitations to using the data from a circle scan or any scan and then constructing a circle out of it.

    I am sure someone asked about the same thing not too long ago and you may be able to search for it.

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    • #3
      I'm trying to get a circle diameter 1st and the form/circularity of a composite blade shank around 10 different diameters.
      sigpic

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      • #4
        Originally posted by AuRules View Post
        Hey fellows I scanned 2 half circles and then tried to create 1 - 360 degree scan from them and it seems to be fishy. Here is my code, Thanks and War Eagle.


        SCAN1 =FEAT/CIRCLE,CARTESIAN,IN,LEAST_SQR,NO
        THEO/<0,0.2585,0>,<0,-1,0>,3.746
        ACTL/<0,0.2585,0>,<0,-1,0>,3.746
        CONSTR/CIRCLE,BF,2D,SCN1B.HIT[1..SCN1B.NUMHITS],SCN18B.HIT[1..SCN18B.NUMHITS],,
        OUTLIER_REMOVAL/OFF,3
        FILTER/OFF,UPR=0
        Adjusted

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        • #5
          Soon as I finish running the part on my old program I'm going to try this. I'm trying to get away from a TP200 TTP and run these on a SP600M scanning head for more accuracy and profile/form
          sigpic

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          • RandomJerk
            RandomJerk commented
            Editing a comment
            Honestly, I think the only thing you'll gain by making that switch is time.

            I'm going to make an assumption here - the scans you're doing are half circles, you need to get into it with different probe rotations? If that's the case, you may be better off doing them as 180° autocircles using adaptive scan. You'll still be able to do the above to make a full circle out of the two halves.

          • AuRules
            AuRules commented
            Editing a comment
            I have 2 - TP200 only and 1 SP600M. I not up on the term adaptive scan. Does it require a certain probe setup or a certain version of software? Time is part of this also.

          • AuRules
            AuRules commented
            Editing a comment
            The LK machine I'm on now the controller does not support scanning, my Global does. So I'm trying to create a program that I can transfer from the LK to the Global for faster time and better results compared to taking 18 points around on each diameter.

        • #6
          Adaptive scanning is a measurement strategy that may not show up if you don't have a scanning probe as the active probe. You could create the program on the non-scanning machine, transfer it, then edit the measurement strategy on the scanning machine. It's the second tab from the left in the auto feature window.

          adaptive.png
          Attached Files

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          • #7
            So you also can a tip angle change inside the feature
            sigpic

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            • RandomJerk
              RandomJerk commented
              Editing a comment
              Nope. Note the Start/End angles in the snippit I posted.

              I just did this exact thing yesterday trying to troubleshoot an assembly issue for some large parts.

          • #8
            Since these blade shanks are made of composite I need a clear picture of the diameter and the form on 360 degree so we can make sure the form is not causing the leaking during test flight.
            sigpic

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            • #9
              Originally posted by AuRules View Post
              Since these blade shanks are made of composite I need a clear picture of the diameter and the form on 360 degree so we can make sure the form is not causing the leaking during test flight.
              Here's how I did it last Friday, I deleted a lot of stuff out.
              Code:
                TIP/T1A-20B0, SHANKIJK=0.0006, -0.342, 0.9397, ANGLE=0
              FOD1       =FEAT/CONTACT/CIRCLE/ADAPTIVE_CIRCLE_SCAN,CARTESIAN,OUT,LEAST_SQR
                          THEO/<0,0,0.2>,<0,0,1>,12.3725,0
                          ACTL/<0.0002,-0.0003,0.2>,<0,0,1>,12.374,0
                          TARG/<0,0,0.2>,<0,0,1>
                          START ANG=180,END ANG=360
                          ANGLE VEC=<1,0,0>
                          DIRECTION=CCW
                          SHOW FEATURE PARAMETERS=NO
                          SHOW CONTACT PARAMETERS=YES
                            NUMHITS=18,DEPTH=0,PITCH=0
                            SAMPLE METHOD=SAMPLE_HITS
                            SAMPLE HITS=0,SPACER=0.25
                            AVOIDANCE MOVE=NO,DISTANCE=0.375
                            FIND HOLE=DISABLED,ONERROR=NO,READ POS=NO
                          SHOW HITS=NO
                          MOVE/POINT,NORMAL,<10.0000,0.0000,10.0000>
                          MOVE/ALL,<10,0,10>,TIP=T1A20B0,SHANKIJK=0.0006,0.3421,0.9397,ANGLE=0
              FOD4       =FEAT/CONTACT/CIRCLE/ADAPTIVE_CIRCLE_SCAN,CARTESIAN,OUT,LEAST_SQR
                          THEO/<0,0,0.2>,<0,0,1>,12.3725,0
                          ACTL/<0.0002,-0.0021,0.2>,<0,0,1>,12.3741,0
                          TARG/<0,0,0.2>,<0,0,1>
                          START ANG=180,END ANG=0
                          ANGLE VEC=<1,0,0>
                          DIRECTION=CW
                          SHOW FEATURE PARAMETERS=NO
                          SHOW CONTACT PARAMETERS=YES
                            NUMHITS=18,DEPTH=0,PITCH=0
                            SAMPLE METHOD=SAMPLE_HITS
                            SAMPLE HITS=0,SPACER=0.25
                            AVOIDANCE MOVE=NO,DISTANCE=0.375
                            FIND HOLE=DISABLED,ONERROR=NO,READ POS=NO
                          SHOW HITS=NO
              SCN1       =FEAT/SET,CARTESIAN
                          THEO/<0.0088,0.0096,0.1839>,<0,0,1>
                          ACTL/<0.0091,0.0085,0.1999>,<0,0,1>
                          CONSTR/SET,BASIC,FOD1.HIT[1..FOD1.NUMHITS],FOD4.HIT[1..FOD4.NUMHITS],,
              FOD7       =FEAT/CIRCLE,CARTESIAN,OUT,LEAST_SQR,NO
                          THEO/<0,0,0.1839>,<0,0,1>,12.3725
                          ACTL/<0.0002,-0.0011,0.1999>,<0,0,1>,12.3728
                          CONSTR/CIRCLE,BF,2D,SCN1,,
                          OUTLIER_REMOVAL/OFF,3
                          FILTER/OFF,UPR=0
              
              DIM LOC1= LOCATION OF CIRCLE FOD7  UNITS=IN ,$
              GRAPH=OFF  TEXT=OFF  MULT=10.00  OUTPUT=BOTH  HALF ANGLE=NO
              AX       MEAS    NOMINAL       +TOL       -TOL        DEV     OUTTOL
              Z       0.1999     0.1839     1.0000     1.0000     0.0160     0.0000 -----#----
              D      12.3728    12.3725     0.0025     0.0025     0.0004     0.0000 -----#----
              END OF DIMENSION LOC1
              DIM CIRTY1= CIRCULARITY OF CIRCLE FOD7  UNITS=IN ,$
              GRAPH=ON  TEXT=OFF  MULT=1500.00  ARROWDENSITY=100  OUTPUT=BOTH
              AX       MEAS    NOMINAL       +TOL       -TOL        DEV     OUTTOL
              M       0.0016     0.0000     0.0025     0.0000     0.0016     0.0000 ------#---
              It yielded this for a visual:

              CircleRound.png

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              • #10
                I used your construct technique, I have not yet run a part but I did try the Analysis Window and it showed 2 circle, form was great (haha) but it should have only shown one. A little frustrated.
                Last edited by AuRules; 10-12-2017, 10:12 AM.
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