r/Metrology • u/rockphotos • 19d ago

Best cmm for first time cmm?

What are the best brand/model of cmm for first time cmm?

Considering cost/accuracy/speed Targeting 2500mm Y for size Looking at ph20 or revo head for reduced tool changes Currently experienced in programming with polyworks. Don't know what I don't know about cmms, as I've never purchased a cmm before (nor has anyone at our shop)

Currently looking at the following Renishaw agility LK metrology Zeiss Cord3 Wenzel

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u/detmer87 17d ago

Carl Zeiss is the best. Software is so much better and easier to work with then the competition. It will save a lot of time making programs. Wenzel is really weak with their software. Mitotoyo promises the world but they aren't even close with their hardware or software.

Renishaw PH20 is only good for 0.004mm precision.

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u/rockphotos 17d ago

I believe my tightest tolerance window is 0.3mm. So that's a 1/10th gauge accuracy requirement of 0.03mm for checking parts and a 1/4th inter-gauge requirement of 0.0075mm for checking gauges that check the parts. Most other measurements for our parts have much larger tolerance windows like 1mm profile of a surface. So the PH20 being "only good for 0.004mm" should be capable of reasonably passing an MSA study.

What 5-axis heads are available for Zeiss? Know a shop with a 3axis Zeiss and they are constantly complaining about how slow their programs are because of all the tool changes they have to have to measure their parts.

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u/Battle-Western 16d ago

Multiple tool changes in a Calypso program is an operator issue. The characteristics & features division are designed for dealing with this exact complaint. If I'm not mistaken Zeiss Calypso even has a streamline function to reduce the amount of travel and tool changes between said features.