Watch our Metrology Coffee Break on the Renishaw PH20

Adrian: Good morning, and welcome to today's session on "Metrology Cafe." My name is Adrian. I'm here with our senior applications engineer, Alan . Today we'll be taking a closer look at the Renishaw PH25 access touch-trigger system. Some of the key features and benefits of PH20 that Alan will be covering today, our PH20's Infinite positioning capabilities. PH20's ability to take points faster with improved accuracy and repeatability, minimum stylus changes required to check part geometries, PH20's inferred calibration techniques, and lastly, PH20s unique 5-axis motion eliminates time spent indexing the head, as well measurements can be taken while only moving the probe head rather than the CMM structure. At this point, I'll hand the presentation over to Al. If there are any questions, please be sure to enter them in the chatbox. We'll have a Q&A session at the end of the presentation. Thank you. Over to you, Al.

Alan: Thanks, Ad. So I'm just gonna start launching my presentation here. All right, so simply put, what is the PH20? It's an indexing probe pad with a built-in TP20 touch probe. It's compatible with the existing range of TP20 modules, which gives you a whole wide selection of trigger forces from low force up to the medium force module. And you can even get extended reach when used with an EM wandering EM2 module. And it has the same crash protection that you've always had with the TP20 magnetic modules. So the head feature Is the same 5-axis motion and infinite positioning as Renishaw's REVO multi-sensor system, only this is what the touch probe instead of an analog probe. The main difference between a 5-axis head and traditional indexing probe heads is that the PH20 doesn't rely on the CMM's axis moving to be able to take measurements. In this case, the A and B axis measure angular rotation, so the head is able to collect data while the CMM remain stationary, which unlocks a lot of potential for increased throughput speed and accuracy.

First thing I wanna discuss is the PH20's Infinite positioning ability. The system is similar to other probe pads like the pH10, and that it has the two axis, A and B axis. But unlike the PH10 is able to rotate in the negative direction in the A axis, as well as the positive direction, and it goes up to 115 degrees in both directions. The B axis, however, is truly infinite as it can rotate without any limitation in either direction. Now the positioning capability guarantees optimal feature access and minimizes the need for stylus changes throughout the program. And another unique feature of the PH20 is that it allows for simultaneous motion of the head and the CMM axis as well while it's positioning around the part. So that's another throughput increase there.

So just a quick little video of watching the machine dance around. The video usually gets a bit of a laugh from people who haven't seen the probe in action before. But it does do a great job of showing how quick and how flexible it is. And before anyone asks, no, I'm not sure why the stylus is lit up. There's no LED on there. And as you can see, the probe has incredibly fast and it's not just fast, though, both accuracy and repeatability actually were improved on the TP20 module, even though you've only changed the head as opposed to running on different machine. Like I mentioned, the system's able to take measurements by moving the head instead of the CMM. We call these head touches. And this is a huge benefit in terms of throughput, since even very fast CMMs need to slow down considerably to actually take the measurement data where the PH20 removes this requirement for the machine to move at all while it's measuring so it can take collect data much faster. And Renishaw put together this little animation to demonstrate the effect of inertia on a CMM frame during measurements.


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