Filter points ?

[pab39]

Hi,

I have a tiny part to inspect and have to take the profile of the end of the tip (0.5mm width)
But, here is the thing, i've got my probed points:

probed_points.PNG

And here is what it looks like and the CAD:

probed_points_CAO.PNG

I don't understand why PCDMIS persists to take points i don't need (the yellow arrows).
As there isn't any datum, the profile can move into the tolerance zone but those points doesn't allow it and it results in non-conform part...

I tried to play with the filter but didn't find something really better.
Is there a way to better filter points ?

[DAN_M]

Can you shorten the scan (take a little off each end)?

[bfire85]

Hi,

I have a tiny part to inspect and have to take the profile of the end of the tip (0.5mm width)
But, here is the thing, i've got my probed points:

probed_points.PNG

And here is what it looks like and the CAD:

probed_points_CAO.PNG

I don't understand why PCDMIS persists to take points i don't need (the yellow arrows).
As there isn't any datum, the profile can move into the tolerance zone but those points doesn't allow it and it results in non-conform part...

I tried to play with the filter but didn't find something really better.
Is there a way to better filter points ?

What version are you working with? What are you using for your scan? 2D profile?

[sealevel]

IF it's a 2D profile, you can masked out the ends with added targets...... it's the + icon left of the trash can at the bottom-middle::::::

scanA.png

[pab39]

I tried to shorten the scan but without good results, and the shorter the scan is, the harder it is to find the edge, or i have to place it manually.
I'm using PCDMIS 2018 and yes, that's a 2d profile scan.

sealevel you're right, i often use those added target to mask some partial scan on circles, i dunno how i can have missed that for a scan ! I'll try it !

The thing i don't understand is why PCDMIS shows me some probed points (picture1) that does not correspond to what it is shown on the analysis (picture2), pretty strange.

Thanks.

[JEFMAN]

I tried to shorten the scan but without good results, and the shorter the scan is, the harder it is to find the edge, or i have to place it manually.
I'm using PCDMIS 2018 and yes, that's a 2d profile scan.

sealevel you're right, i often use those added target to mask some partial scan on circles, i dunno how i can have missed that for a scan ! I'll try it !

The thing i don't understand is why PCDMIS shows me some probed points (picture1) that does not correspond to what it is shown on the analysis (picture2), pretty strange.

Thanks.

I would say that both pictures show the same hits...
defaut scan.PNG

[pab39]

I would say it would better be like that no ? still don't understand those yellow arrows, like if there was a breach in the part !

hits.JPG

[JEFMAN]

You are measuring a small arc (less than 180°), and I believe the cmm didn't take hits in this area.
small arc optiv.JPG
Small arc method gives a wrong center and a wrong diameter, so I think it can explain the yellow arrows...
Could you try this methd, and then share the result ?
https://www.pcdmisforum.com/forum/pc...d-from-hexagon