Keyence Optical Measuring device

of course not. it was most likely calibrated at the factory and is similar to a 'lubed for life' bearing......

Well, in theory, there's nothing to the design that is subject to mechanical change or wear - it's a fixed telecentric lens on a simple industrial digital camera, so there are no moving parts. Once the "pixel pitch" is set, there's no reason it should change (short of the machine being disassembled, dropped, etc.) The only other step would be correcting optical aberrations in the lens, which usually achieved capturing an image of an optical chessboard standard and compensating for the distortions, but this should only need to be done once, just like teaching the pixel pitch, since glass isn't actually a liquid.

That said, other systems that work on the principal do come with standards to allow you to "re-calibrate" or reteach the pixel pitch. I believe OGP's SNAP comes with an etched glass standard similar to their normal vision systems, and my OASIS machines have each come with two different Deltronic pins and a sled to allow them to be positioned for teaching the X or Y pitch.

(Shortly after getting our OASIS machines, our calibrations guy asked me how often they need to be calibrated, and I forwarded the question on to the manufacturer. Their reply was, "technically never, effectively as often as you want." Our calibrations guy decided a "Calibrate Before Each Use" sticker was appropriate...)

As for Keyence, their background is process controls and inspection, which - rightly or wrongly - is not footed in the world of traditional metrology that we're used to. Their lineage is, for example, cameras mounted on a process line for inspecting completeness of inkjet printings on food packaging, or continuous visual two-point diameter inspection of a copper wire as it is being drawn (because, hey, if the hole in the form making it was round, the wire should be round, too, right? Sounds like machinist talk.) This is why you don't see any commonly accepted standards to which their machine was calibrated, or even how its OEM accuracy spec was determined. In other words, they are not from "our" world

I never got to where I was realistically considering the purchase of a Keyence IM, so I never got around to badgering them about calibration to ISO/ANSI/ASME standards and whatnot.

Sorry about the long post, I do find this stuff interesting. I've been engineering a vision system for our own purposes, namely locating parts on a conveyer for a robot, that works on some similar principals - http://i.imgur.com/M6MDDj4.jpg

of course not. it was most likely calibrated at the factory and is similar to a 'lubed for life' bearing......

Well, in theory, there's nothing to the design that is subject to mechanical change or wear - it's a fixed telecentric lens on a simple industrial digital camera, so there are no moving parts. Once the "pixel pitch" is set, there's no reason it should change (short of the machine being disassembled, dropped, etc.) The only other step would be correcting optical aberrations in the lens, which usually achieved capturing an image of an optical chessboard standard and compensating for the distortions, but this should only need to be done once, just like teaching the pixel pitch, since glass isn't actually a liquid.

That said, other systems that work on the principal do come with standards to allow you to "re-calibrate" or reteach the pixel pitch. I believe OGP's SNAP comes with an etched glass standard similar to their normal vision systems, and my OASIS machines have each come with two different Deltronic pins and a sled to allow them to be positioned for teaching the X or Y pitch.

(Shortly after getting our OASIS machines, our calibrations guy asked me how often they need to be calibrated, and I forwarded the question on to the manufacturer. Their reply was, "technically never, effectively as often as you want." Our calibrations guy decided a "Calibrate Before Each Use" sticker was appropriate...)

As for Keyence, their background is process controls and inspection, which - rightly or wrongly - is not footed in the world of traditional metrology that we're used to. Their lineage is, for example, cameras mounted on a process line for inspecting completeness of inkjet printings on food packaging, or continuous visual two-point diameter inspection of a copper wire as it is being drawn (because, hey, if the hole in the form making it was round, the wire should be round, too, right? Sounds like machinist talk.) This is why you don't see any commonly accepted standards to which their machine was calibrated, or even how its OEM accuracy spec was determined. In other words, they are not from "our" world

I never got to where I was realistically considering the purchase of a Keyence IM, so I never got around to badgering them about calibration to ISO/ANSI/ASME standards and whatnot.

Sorry about the long post, I do find this stuff interesting. I've been engineering a vision system for our own purposes, namely locating parts on a conveyer for a robot, that works on some similar principals - http://i.imgur.com/M6MDDj4.jpg