BF vs. BFRE

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

  • BF vs. BFRE

    Hi All,

    Can anyone tell me the best time to use BF or BFRE on circles. I am using points to make circles then cylinders. I am also usings mutiple wrist angles. Does this make a difference?

    Thanks
    Dale
    PCDmis 3.5mr2 CAD++

  • #2
    I cant tell you about the Bf or BFRE but.....I wouldn't suggest using multiple tip angles if it is possible to probe greater than 180 of a circle with one probe position. Also if it is absolutely necessary to use several probe angles I would take individual surface points with sample hits to get proper vector compensation then construct the circles or cyl's. It has been stated before that you should have at minimum 3 levels for your cyl's to avoid any trouble with vectors repeating for the constructed cyl feature.
    sigpiccall me "Plum Crazy"....but you only go around once!

    Comment


    • #3
      i was told in training to alwaysuse BFRE when constructing circles from points. i have used both and have seen no difference in the results though.
      sigpic
      Southern Man don't need him around anyhow!

      Comment


      • #4
        About time toyota got a real CMM program!!
        sigpic

        Comment


        • #5
          Thanks Mike,

          I am doing most of that, I didn't use 3 levels because the thickness is small. I only have about .750" thickness so I took points on each side of surface.

          thanks
          Attached Files
          PCDmis 3.5mr2 CAD++

          Comment


          • #6
            by the way, how do you get the picture to show up by you names?
            PCDmis 3.5mr2 CAD++

            Comment


            • #7
              Click on the user/cp.
              Click on edit avatar.
              Select upload for your computer.
              Note the size limitations.

              Use www.resize2mail.com to reduce the size if you need. Let's see a good one!

              TK
              sigpicHave a homebrew

              Comment


              • #8
                Stop drooling back to the question

                It depends on your accuracy requirements. It would seem to me that since each different probe orientation would have a different effective tip radius (and therefore compensation), you would need to comp each touch and then only do a BF of all of the points.

                If you do that then you would need fairly accurate vectors to the ACTUAL surface. This then means that you should pre-measure the bore and establish the actual centerline and then go through again for your final check.

                This would apply also if you are using a star probe(which i despise).

                ps.
                Dale send me an email. I haven't talked with you since you left AMP
                J
                Links to my utilities for PCDMIS

                Comment


                • #9
                  Good pix, Dale.

                  TK
                  sigpicHave a homebrew

                  Comment


                  • #10
                    Thanks for the help. I didn't realize my pictures were to big. Got it now.

                    Thanks
                    PCDmis 3.5mr2 CAD++

                    Comment


                    • #11
                      I haven't had too much trouble measuring circles with different probe angles. I take individual points, right on the centerline, and at the exact Z levels. Then create the circle from the 4 points
                      sigpic Life is not a journey to the grave with the intention of arriving safely, but rather a skid in broadside, totally worn, proclaiming WOW What a ride!

                      Comment


                      • #12
                        That’s what I do also Andrew. I been working on some testing this afternoon and I am leaning towards the block was bad. I just recalibrated, measured several other Ø's the same way as my program and all 3 are within .00002" of each other. The gremlins must be around this week. That is all I can figure.
                        PCDmis 3.5mr2 CAD++

                        Comment

                        Related Topics

                        Collapse

                        Working...
                        X