Star stylus M3 XXT, DK0.8 L44

[[Ju...]]

cic.metrology.us@zeiss.com

We have recently ordered one of these products (626113-5000-208) for our ZEISS Contura machine and we don't know what kind of baseplate or options there are to aligning the star to the CMM coordinate axes (in other words the clocking of the star is determined by the baseplate thread length and the star thread shaft length).  Can you help me figure out how to get this aligned properly?

[[To...]]

You'll need one of these to allow you to rotate the star into position

https://shop.metrology.zeiss.com/INTERSHOP/web/WFS/IMT-US-Site/en_US/-/USD/ViewProduct-Start?SKU=626103-6180-010&ExtendedNavigation=true

 

The problem is the B dia is 11mm from tip to tip.  Subtract your 0.8 probe diameter and this leaves you at 10.2 diameter.  Now, subtract the 5mm body dia, then divide by 2, leaving you at 2.6 protrusion from the shaft.  You would need a 5mm diameter reference sphere in order to qualify the stylus.

Edited November 20

[[Ju...]]

Can we just change down our sphere coverage?

[[To...]]

The initial phase of a "Qualify Passive" qualification scans to the equator no matter what the sphere coverage is set to.  The sphere coverage only comes into play in the 2nd half of the qualification where it takes 6 points.  Meanwhile, you've tainted the bending parameters established in the beginning scans. 

Not sure what others on the forum feel about the following but if I absolutely had to do this, I would take a 5mm probe, preferably a new one, and measure it with the MasterProbe to get a diameter and form error, then create a new reference sphere using the info I collected.  Then, qualify my small star. Obviously, there will an "uncertainty" value associated with this process, but if the tolerance allows, it might get you through a measurement. If you can correlate measurement with another instrument, this might help you sleep better.  Only do this at your risk.

Edited November 21