Luca,

This sounds like a great idea and would be a big step forward in
drilling registration. I would like to know how you can do it but
appreciate this must be a secret until you have filed the patent. 

As each layer can be out in a different direction, can the system detect
the difference between each layer and then optimise, or does it just use
one reference layer? Also, is it possible to fit to existing machines or
only new ones?

Regards
Paul Gould
Teknacron Circuits Ltd

In message <199701312159.WAA06383@mbox>, [log in to unmask] writes
>I'm an italian engineer specialized on AI-software application to ml-PCB
>manufactoring.
>I would like to know the judgement of technical people on a system that I'm
>developing/testing, and their experience.The system can detect a signal from
>a CNC machine while it's drilling a particular small test-coupons on
>ml-pcb(it's not important now ,how it can do it).
>After it can calculate the innerlayer misregistration and correct
>the all coordinates of the drilling file.
>This correction can make a compensation to offset/rotation and
>EXTENSION-SHRINKAGE.It can operate also with a Multiline registration-system
>because it does'n create  new register holes but corrects the coordinates of
>the file.In the production enviroments that I know, the big problem is not
>the "RANDOM" MECHANICAL REGISTER DEFECT but the LAY-UP-DEPENDENT SYSTEMATIC
>DIMENSIONAL INSTABILITY.So, for me is easy think that it is better  make a
>best correction of the all coordinates one time and apply to all boards than
>make a new offset to register holes for any board.I think also that the last
>methodology cannot have a better result than a Multiline register system when
>the big problem is dimensional stability.For my experience is very hard the
>modification of the film dimension to compensate the material dimensional
>instability due to the dinamics of the suppling firm of lamites and organization
>delay time in film production.
>This is my think, and would like to know Your think about.
>Thanks,
>
>                                                 Luca Marchese
>                                                 [log in to unmask]   
>

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