[Me...] Posted January 2, 2019 Share Posted January 2, 2019 https://www.renishaw.com/cmmsupport/kno ... ing--22140 I thought this article was a little subjective 🤣 Link to comment Share on other sites More sharing options...
[Aa...] Posted January 3, 2019 Share Posted January 3, 2019 It does hint at something that has bothered me for some time, though. If some error comes from differing measuring force/pressure (is anyone actually doing contact mechanics calculations to determine the contact area?), why isn't there a good way to do a quick "pre-measurement" of a feature ahead of the actual measurement to ensure the measurement path is set for where the surface actually is? Would that not eliminate a lot of said error? Link to comment Share on other sites More sharing options...
[Ow...] Posted January 3, 2019 Share Posted January 3, 2019 Please sign in to view this quote. Probably not as direct as you would want and you might know about it but, there is a way to measure circles, slots and elliptical features before measuring by using the "Meas Ref" tab found under the projection menu tab of the feature. I haven't used it in some time, but, If I remember correctly, the probe will take like 4 to 6 points to locate the feature and then measure it with the defined strategy after locating the exact location and Height. Link to comment Share on other sites More sharing options...
[Ri...] Posted January 4, 2019 Share Posted January 4, 2019 Of course Renishaw is going to be biased when it comes to Active vs Passive scanning. I've seen numerous arguments from them, and in my 10+ years of Metrology experience I can safely say this - Active > Passive - no contest. Any time them or someone else wants to gripe about uncertainty in an Active scanning head, just show them this..... https://www.zeiss.com/metrology/product ... xenos.html [img]https://www.zeiss.com/content/dam/metro ... -image.jpg[/img] Link to comment Share on other sites More sharing options...
[Ri...] Posted January 4, 2019 Share Posted January 4, 2019 Maybe I should clarify something too.... Zeiss Active scanning. I cannot speak to the other guys who have developed their own Active scanning heads. Link to comment Share on other sites More sharing options...
[Me...] Posted January 4, 2019 Author Share Posted January 4, 2019 Please sign in to view this quote. Correct me if I am wrong, but I believe Zeiss are only guys that have Active scanning heads. I know this was definitely true at one time. I am unaware of any other competitors that have developed this and have machines equipped currently though. Link to comment Share on other sites More sharing options...
[Ri...] Posted January 4, 2019 Share Posted January 4, 2019 Please sign in to view this quote. I know that Leitz has their own - they may not call it Active Scanning, but it handles up to 1000g and 800mm in length probe - no way a Passive Scanning head is doing that. Mitutoyo has their own scanning heads that look like Active Scanning heads as well. Link to comment Share on other sites More sharing options...
[Ow...] Posted January 4, 2019 Share Posted January 4, 2019 I used to work directly with a Holroyd colleague in Europe who used a Leitz 3D scanning (their active) head to check the same exact part's I was checking with a Zeiss Gold. Interesting that even though the part's we're checked 3 months later and were shipped 5K miles across the ocean, checking a helical rotor with a rotary table holding 10 micron tolerances, the part's checked within 2 micron of each other. Their report's looked very similar, especially curve plots. I guess one shouldn't be surprised the plots look a lot alike because Zeiss and Leitz headquarters are just 200 miles apart in Germany. Link to comment Share on other sites More sharing options...
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