Pointer Stylus

[[CA...]]

Hello!!!
For some measurement of small parts we need to use small probes, 1mm is not enough, so we decided for a pointer stylus.
Now we have a doubt, how to qualify it? With the same reference sphere? When possible how to reduce the amount of points for qualification.

GRUESSE an alles!!!
Für einige Messungen von Kleinteilen müssen wir kleine PROBEN verwendet werden aber 1 mm reicht nicht aus.
Deshalb haben wir uns für einen Pointer Stylus entschieden.
Wir haben die folgenden Zweifel: wie können wir diese Stylus qualifizieren? Mit dem gleichen Referenzkugel? Wenn möglich, wie kann man die Anzahl der Punkte für die Qualifikation reduziert? oder andere Möglichkeit, z.B. die Sphere couverage zu reduzieren.

CMM type and VAST
Acura G2
Vast RDS-XXT-TL3

[[To...]]

I qualified a pointed stylus on an XT-Gold sensor before with some reasonable results. The stylus had a .1 (.0039”) radius. I had to reduce the sphere coverage to something slightly less than the cone angle of the stylus so I wouldn’t shank out. Funny thing. Customer was not measuring anything with this stylus. They were using the stylus to scratch the surface as a timing mark. Honest.

I don’t believe a qualification is possible with XXT but I’ve been wrong before.

[[CA...]]

I think that small stylus is a problem under 0.3mm, at least for RDS-CAA, now I will show you the problem, the Passive Qualification ever take 180 degress, no matter what to put on Taper Angle, but will be Re-Qualification different (consider the new Taper Angle), and Is it recommended for VAST XXT-TL3 with RDS-CAA?
Please if you or members know something about this problem, give me information.
Best Regards

[[To...]]

It is my belief that you cannot qualify this stylus with a passive sensor. Can you make it work? Possibly. I have no clue what would happen if you tried to use CAA.

The first part of the passive qualification utilizes 180° sphere coverage regardless of sphere coverage setting. This portion of the qualification establishes the bending parameters of the stylus.

After this segment of the qualification, the routine begins the actual qualification of the stylus, i.e. size, locations. Here, the sphere coverage is applied but utilizing incorrect bending parameters.

Per your sketch, the included angle of this stylus is 30°, which is what you would need to use as your sphere coverage, or something slightly less than 30° I would monitor my sigma values to determine how big I can go.