Sphere qualification

[[Ju...]]

I have 4-sided star with really short arms which cause it to shank out during qualification. Is there any way to prevent the tactile scanning from going to the equator so that it does not shank out?

[[Ma...]]

I think if you reduce coverage and not using tensor, then it should do the trick.

[[Ju...]]

what do you mean not using tensor?

[[Ma...]]

You can define how you will calibrate your probe - pasive, tensor, dynamic tensor.

I also found you posted a question in another post. That is not working?

[[Ju...]]

Well we would like to just stick to using the 30mm sphere that we use for all our styli qualifications just to keep it simple. We only have two modes to use for qualification and if we use the geometry re-qualification it actually does use the sphere coverage correctly and will not go to the equator but at the same time it only probes 6 single points and I do not feel that this is a good enough process to qualify the sphere. Scanning would be better but when we use that method it always goes to the equator and ignores the sphere coverage.

[[Ju...]]

probes 6 single points and I do not feel that this is a good enough process to qualify the "Styli"

[[Ma...]]

That "Standard" option - what's there?

I am wondering if you can do manual path - i remember when i was doing qualification for disk i had to do manual path - defining own points. Perhaps this would be the way.

But if you have smaller sphere, then it would be better to use that.

[[Ju...]]

Maybe it could. Uhm I don't know it's locked. Thanks for the help tho.

[[Ri...]]

Use an 8mm Sphere.

[[Jo...]]

I was told that using probes smaller than ~10% of the diameter of the calibration sphere is not a good idea, but cannot find any official documentation of this. (We use an 8mm sphere for all our smaller probes and it seems to work well) 

[[Ky...]]

I don't know that I heard the 10% rule (not to mention, that would mean qualifying a 3 mm on a 30 mm reference sphere wouldn't be good and I've never had issues with that). My general rule of thumb is anything 1 mm or below (sometimes 1.5 and below) should be qualified on a smaller reference sphere (usually the 8 mm I think).

 

The sphere coverage doesn't affect the scanning part of passive qualification (it does on the point taking part and the geometry requal), so that isn't really a solution I think. I would think the only real answers is either a longer stem on the stylus or a smaller reference sphere.