Just a cmm noob with another question. My company needs me to verify thesize of a polygon (3 sides). We do not have a go/no go pin in yet and they are asking for answers. PCDMIS is showing the Polygon to be larger than nominal and they do not believe my results. (Measured as Auto Polygon) Is there a secondary study I can do to prove the size of a polygon without using Auto Feature and in your experience is Auto feature on a polygon reliable when it comes to measuring Diameters. I would assume I need to do some sort of study and measure from the center of the rads to the Middle of the opposing lines and do some sort of Intersecting points. Using PCdmis 2021.1
Profile points could have also discovered that quickly. But what you did works good as well. I like using individual points so I can actually see what the surface is doing. is it straight? Is it tapering? Ect...
Profile points could have also discovered that quickly. But what you did works good as well. I like using individual points so I can actually see what the surface is doing. is it straight? Is it tapering? Ect...
The OP,s method will not give the correct size if all three angles are not identical, the greater the difference between the angles the greater the error it is to the correct way to get the tangent circle.
If you do not want to use the Tangent to 3 lines construction a method to use is.
Measure the 3 lines.
Construct 3 mid lines from the measured lines, you may have to reverse the lines to get correct mid line.
Construct a point from the 3 mid lines, this will give he centre of the circle
Using Distance Dimension select the centre point and one of the lines, set Relationship to Feature, Orientation to Perpen To, Distance Type to 2 Dimension.
Change the output to none so this dimension is not reported.
Construct a Generic circle, use radius and input the distance dim as the measures Radius such as DIST1.MEAS.
Report the generic circle diameter.
By using separate points or scans you can construct lines or look at individual points or use them in assigns or arrays. I find it easier to start out with points and do constructions of anything I need from the points. Reason being is I have to make reports with maps. If I use a measured line and pull points from the line to make any other constructions, my point map leader lines don't ever look right.