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Metrology


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Did you ever notice that if a part is good the machinist is a great machinist, but if the part is OT then your ability to accurately measure it comes into question? "It was fine on the machine. No way it's out like you say." Uh huh. 😕

And some machinists can be very offended if you reject their part. It's like telling them that their baby is ugly. They get all worked up like you're attacking them personally. "I've been making this part for 5 years and it's never been rejected!" Uh huh 😕

And one of my favorites. "Ooooh. That's just a setup part." Uh huh 🤣
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or...."that's the way we've always done it" 🙄
You have to have thick skin in this line of work. Hero to zero real fast!
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Exactly, We had some parts with questionable results so they sent them off to be measured with "our" program. Great they were good.. I inherit the next run and they are way out. "impossible they were good last time" . I pulled the reports from previous run and 3 parts had a true position on 8 holes ALL had 0.0000 inch deviation. hmm they were really good..
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I've been proven right way more than wrong but, just like Forrest Gump said, "Sh*t" happens.
The key is having a lot of experience in all kinds of measuring methods and machining, most of all knowing how to double check stuff manually or functionally.
My crown achievement was proving a very large company who is considered the best in the industry wrong, in the UK.
It took about 6 weeks for them to receive the parts back and confirm my point but, I was confident, even though I seriously did lose a little sleep a few nights as I had little support on my end.
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Does'nt almost every company consider them self as the best? How to otherwise justify the existence? (Unless you focus on cheap stuff) I can see the sale's slogan in my head.

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😃
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My favorite line "We've been making this part for 30 years" or "thats not how we did it last time" Yes and im telling you last time they were bad and this is what the customer is asking you to do as a result FFS. 🙄
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There was an article on Normalized Deviation, can't remember where I read it, that explained how we rationalize" oh that's normal, it's just a little more" etc ..
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Hello everyone,

I wish I am in the right section of the forum. I just want to know how calypso Zeiss calculates the sigma and the Form of each measured Feature. Is there any documentation about that?

Thx
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