Probing error / verification program.

Hello.

I need some help with a program I am writing on our Leitz to check the probing error of each stylus and volumetric error of each stylus back to the master stylus. I am using a Ø25mm ceramic sphere as the artefact. Probe is an HP-S-X3C.

I am starting with touch probed sphere for each stylus (4 levels, 29 hits), then a scanned sphere (360° circle around the equator, then 2x 180° circles over the sphere in the XZ/YZ planes, all created with GENSCACIR, then use COLAPT to connect them into a sphere).

The XYX deviation and form & diameter for everything is within 0.001mm, except for the scanned sphere form deviation, which is around 0.005mm (using SPHFRM). Questions below;

Is the method above OK for creating a constructed scanned sphere? If not please advise.

Is it possible to graphically analyse the evaluation from SPHFRM?

I have a star probe with the working length of each stylus is only about 5mm, so I can't scan around the equator. Is it possible to scan a 360° circle offset from the equator with the correct approach/probe comps etc? Similar to circle B on the image below.

Thanks.

Karin Schneider over 2 years ago

Lots of questions... In order to locate the sphere form problem you must plot the individual circles to see what is going wrong. Outliers, ovality etc. could really be anything at this point.

The method for creating the sphere is OK, but the whole procedure is a bit over the top. You can scan away from the equator using "ScanOnCircle (DIA=xx, SFA=yy)", however you must work out the diameter & surface angle at the location you want to measure.

I think the scanning is a bit over the top when you want to check the probe offsets, especially as there is no scanning correction in the tool data, apart from the effective radius.
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