Output Data (Deflection)

[[Ja...]]

Hello all,

I'm currently setting up a small study to improve measuring techniques for my company. The study itself is relatively simple, measuring ring gauges to test different probes, but I can't seem to find a way to output any deflection data for the probe rod itself. I would assume that this is something that is tracked internally so that scans can be done with constant pressure, but have not been able to deduce how to output that data. The closest statistic to this would be rigidity, but I am not sure if this would provide the correct data in context, as rigidity seems like a constant value for a given probe, rather than a variable one.

I'm an intern at my company and am very new to Calypso and CMM in general, please excuse if this is a relatively easy question to answer. We are working on a Prismo machine with the base version of Calypso (no paid upgrades).

[[Er...]]

Calypso calculates everything to compensate for getting an accurate measurement. To illustrate, if I want to know how fast a car is moving do I need to know how fast the tires are rotating?

When qualifying a probe I look at the radius and sigma. Those are what I would track for probes.

Probe selection is often dictated by the smallest diameter I need to use on a part. If there is a 2mm diameter hole, I need a 1mm diameter probe. If I can use a 5mm diameter probe to measure a part I will use it on the rest of the part.

Measuring techniques that affect measurements are many. The probe is actually what I worry about least.

[[Ja...]]

My study is going to go over a multitude of differing techniques (probe material type, Gauss filter and scanning speed, scanning type), as we're looking to improve overall reliability, and create a testing procedure to learn more about new probes we purchase. So to clarify, we are trying to cover a lot more bases than just the probe.

My supervisor has interest in getting an output of the deflection data to see how probe length might affect measurements, but I have not been able to find anything about it on official websites or forums here. If it's not possible due to deflection not being truly measurable, or available in a parseable form, that would probably be fine, but any knowledge on how to access that data would be helpful. Thanks again!

[[No...]]

With active Zeiss heads (VAST and VAST XT) deflection is controlled by the controller unit and is not accessible by the user. This also means that even if you could read out deflection, you wouldn't be able to distinguish between probe-only deflection (caused by bending) and head deflection.
Head deflection has two tasks: First it allows the head to react quicker to the bumpiness of the surface scanned. It's faster to just lift the probe inside the head than to move the whole machine axis. Second it's used as an early warning in collision detection. Whenever the probe starts to move in a certain direction, the head deflects in the same direction to allow for maximum reaction time in case of a collision.

[[Ja...]]

Thank you for the succinct answer, that helps a lot!

[[Er...]]

Zeiss has a Cookbook that may be a good starting point. It may be one of the manuals at the CMM.

If you go to the Zeiss Portal under Knowledge Base search for "Cookbook" and it will show up.