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
Never trust fancy features such as "auto-polygon", "slots" etc. Just break the feature down into it's base components.In this case, lines or planes, and intersection points, then mid-points. From there, you can make widths, a min/max circle, whatever is needed.
@Kai So if i measure 3 lines, make 3 Intersection points and then Midpoints from there I am able to Find my Diameter By constructing a circle from my Midpoints ? Sorry i'm not too familiar with this type of stuff. How do I report Min/max ?
Is it a "ROUNDED POLYGON"? You can scan it and do profile of a line. Or you can scan one small radius find the max index or extreme point and do the same for the opposing large radius. this is how you check a Stoffel polygon with a micrometer. distance across opposing "radii". If it is a Stoffel then it is actually a spline generated from a formula. See the Machinist handbook.
Benedictj1 Yes it is a rounded polygon. Scanning for a profile is pretty damn smart, I could probably just scan one corner to figure it out or should I do a closed scan on the entire feature ? Again I apologize i'm not the brightest crayon in the box.
you can do a section scan or a closed linear scan. However, be aware of where the START and STOP are located make sure they are not on the "peak" of the radii.
you can do a section scan or a closed linear scan. However, be aware of where the START and STOP are located make sure they are not on the "peak" of the radii. This would be for the PROFILE OF A LINE. do individual scan over the radii to find the Extreme point. I believe I asked about adding an auto feature for this.
Don Ruggieri . It can be tricky to align to when it is on the end of a shaft with no flats. I see these all the time because they are great for keyless power transmission where sanitation is a concern.
Matthew D. Hoedeman I will ask about gage pins. Thank you
Benedictj1 My Polygon looks slightly different will your process still work? Here is a picture. and what is the reasoning for finding the "extreme point" on the rad?