Line-Circle intersect

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  • Line-Circle intersect

    I am attempting to find the intersect point of a line and a circle.
    I keep getting the intersect of the opposite side of the circle. Have tried reversing the line, the circle, both, reversed the work plane of each then both. Nothing give the side of the circle I need. Bothe line and circle are measured in the same workplane. Even tried projecting both features to workplane with no effect.
    Any assistance greatly appreciated.
    v2013 MR1, v2015.1
    B&S Global 544, 555
    Mitutoyo A504 w/PC-DMIS

    sigpic
    Since 1994

    Never force anything. Get a bigger hammer.
    (Advice from my dad.)

  • #2
    You should be able to change which side a pierce point intersects a circle by changing the line vector. You are constructing a pierce point right?

    Craig
    <internet bumper sticker goes here>

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    • #3
      I assume you are trying to create a point at the intersection. When creating the point are you choosing "pierce"? When you "reverse" the line are you creating another line or just reversing the vector of the line you have measured? I usually create another line by selecting the line and "reverse" this usually gives me the pierce point on the side of the circle I want. Also, I assume you are currently in the same workplane in which the features were created.

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      • #4
        Not pierce point - intersect point. Also tried entering features in reverse order with no effect. I thought pierce point was for intersecting a line and a plane.
        Will try pierce point of line and circle and report resultes here.
        Thanks, Craig. (Wild looking party, too bad there's no sound!!)
        v2013 MR1, v2015.1
        B&S Global 544, 555
        Mitutoyo A504 w/PC-DMIS

        sigpic
        Since 1994

        Never force anything. Get a bigger hammer.
        (Advice from my dad.)

        Comment


        • #5
          Goodluck:
          I am reversing the line's vector in the 'construct' drop-down. Are you suggesting that I should measure the line in the opposite direction? (That would screw up the flow of the program.) And yes, I am reporting in the same workplane as measured.

          Update: I tried pierce point. Looks like the point is now center of the circle. The line overlaid on the circle would show as a chord, not the diameter.
          Still stumped.
          v2013 MR1, v2015.1
          B&S Global 544, 555
          Mitutoyo A504 w/PC-DMIS

          sigpic
          Since 1994

          Never force anything. Get a bigger hammer.
          (Advice from my dad.)

          Comment


          • #6
            Don, is it a circle or a cylinder? You need a circle. Pierce point should be giving you what you are after. You do not need to remeasure the line, but you should construct a new line that is the reverse of the first. (As opposed to just reversing the first.) Also make sure you select the line first and circle second when constructing the pierce point. HTH
            sigpic"Hated by Many, Loved by Few" _ A.B. - Stone brewery

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            • #7
              Problem solved (I think)

              Looks like you guys have pointed me in the right direction. I constructed a pieirce-point, line and circle, not projected or reversed. The result is very close to nominal.

              Thanks for making me think. Too much beer over the long weekend made my brain soggy.
              v2013 MR1, v2015.1
              B&S Global 544, 555
              Mitutoyo A504 w/PC-DMIS

              sigpic
              Since 1994

              Never force anything. Get a bigger hammer.
              (Advice from my dad.)

              Comment


              • #8
                So, to make sure I understand fully... you measured a circle in say the zplus workplane. You then measured a line in the zplus workplane. The line intersects the circle. You want to construct a point where the line intersects the circle?

                I have always done this by creating a pierce point. If the point is created on the wrong side of the circle I erase it, construct a reverse line and try constructing the point with the reversed line and the circle. This always works for me as long as the line and the circle actually intersect.

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                • #9
                  Goodlck; you are correct. Line and circle are in the same workplane. The line cuts across a portion of the circle and I need the intersect point. Pierce Point gave me what I needed. (I guess Intersect Point was a carry-over from my old MM4 days although it's been a few years.)
                  v2013 MR1, v2015.1
                  B&S Global 544, 555
                  Mitutoyo A504 w/PC-DMIS

                  sigpic
                  Since 1994

                  Never force anything. Get a bigger hammer.
                  (Advice from my dad.)

                  Comment


                  • #10
                    it's a very common issue this - if you do and intersection point pc-dmis tries to construct the point at the intersection of the lines vector and the circles vector.
                    Automettech - Automated Metrology Technology

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