Use a fixed factor to offset the effects of spraying the parts or coating thickness

[[Yi...]]

Hi

It would be helpful if the software could apply a fixed factor to measurement results to compensate for coating thickness and neutralize it.

My parts are coated in a glossy black coating and have very precise diameters of g7. As a result of the pre-scanning spray, I am unable to display real results in the report.

After performing additional verification of the diameter values using a micrometer, and since my spraying process is repeatable, there is a fixed value that I would like to offset from the diameter results.

By adding or subtracting a fixed factor, for inner and outer diameter respectively, I will be able to present a unified and valid report for all drawings requirements.

Does the system include such a feature that I am unaware of, or is it necessary and possible to independently program such a feature?

Thank you very much

[[Ja...]]

You could technically do this on the diameters using a user defined check , taking value of diameter and adding a value...however, it just doesnt feel the right thing to do for me from a metrology stand point.  Spray thickness is difficult to quantify and hard to prove its consistent .  As an aside measuring diameters with a micrometer can return spurious results so id be careful using thats as your master.

In the end, if the tolerance is that tight and you demonstrate that GRandR fails without spray, and via a set of tests using CMM/PMM that 3dsl has a bias when using spray that is not acceptable to you then i think the right answer is in direction of considering those alternative measurement devices to evaluate that feature.

Hope this helps

[[Yi...]]

Hi James

Happy to receive your helpful response.
I have tested my spray thickness several times against calibrated Johnson blocks and I used to spray with the same brand spray material and in the same method, while I have also a close visual check on the white color result.

As I mentioned, since the diameters are in-spec, verified by manual measuring tools, I do not want the SW report to declare a deviation for these dimensions, while I know that this result is due to the spraying process which has a decisive effect when the tolerance is so tight.

Therefore, I was looking for a way to display the diameter result by adding or subtracting a fixed factor.

Thank you very much for the idea you are offering me now and I will examine its use together with our product engineers.

[[Re...]]

Hallo,

wie ist das Delta denn? Bzw die Schichtdicke der Masttierschicht, die du ermittelt hast?

Danke 

[[Yi...]]

Hello      

As I have already written, I have conducted several experiments on calibrated Johnson blocks and have repeatedly seen that the thickness of the spray coating layer ranges from 8 to 9 microns.
I maintain strictly the same working method and the same material from the same spray manufacturer.

In this way, it can be said, cautiously, that the diameter measurement values obtained by the SW is larger or smaller, respectively for the outer and inner diameter, by about 15 microns. This is well proven through additional check carried out with a manual measuring tool.

This is the value I would like to give to the constant factor which I would like to use when it comes to very precise diameters where the spray layer takes the result out of spec.

What do you think about this?

Can I please also get an opinion from one of the ZEISS representatives here in the forum?

Many thanks in advance