> hi, i have a question relating to fiducial, is > the fiducial normally comes with the pick and > place data from the custommer or we have to > define it by ourself? how to set its coordinate > so that the cp6 and ip3 (using Fujicam software) > will be able to regconise it, and what is the > machine origin? I knew that it should be set from > the pin hole which is normally -5 for x and 5 for > y or vise versa so what is the exception? the > coordinate of fiducial should be calculate from > the origin, am I right? but when I start the > machine the fiducial still not in the view of the > camera, if I go back to the program and remeasure > the fiducial from the machine origin then if the > machine excepted the fiducial, should all parts > will misalign?, if I shift 2 fiducials to 2mm to > the left direction, should I move all parts 2mm > to the left as well? how is the machine calculate > for placements using 2 diagonal fiducials?
Vincent, Rob was right.Your PCb cad data will have the fiducials already in the file.If you use FUjicam or Circuit cam for machine programming and you work w ASCII data file to begin with, You won't have any problems.Most of the times, even if the fiducials are defined as something else (Test points,parts etc) you'll be able to distinguish and edit them as such(FIDS). When you start w gerber files that need to be digitized, your fiducials might not be in the same layer as rest of the pads ,so keep an eye for them .They are there.If they are missing though,you can "make" a test point or via hole into a fiducial.As long as your board Layers have the same origin you'll be fine. Now if I remeber well there is another offset on Fuji's aside from the lockating pin you are reffering to.A machine datum as opposed to the table datum.It is something located in one of the machine configuration files (the ones you do not edit unless you calibrate the machine).Ask one of your techs they should be able to tell you how much this offset is.This will be different on every machine but will be consistent for every program you run on that piece of equipment.When you know that X and Y offset you can type it in your Fujicam software when generating the pick and place program.I'm not sure but I think you can put this value in your line definition menu. (I haven't been working w Fuji's in four years so I'm not exactly sure where everything is anymore). For minor adjustment changes use global offsets like the previous message suggested.Other rules of thumb: Use diagonally opposed fiducials, ideally 3. Use electronic files Measuring w calipers is not accurate. Yes editing your fids locations more than likely will misalign all your parts. Contact me at Klasage@hotmail.com if you have other questions. Good luck Rob
Klasage@hotmail.com
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