[SOLVED] What files do the PCB manufacturer need and what files do the assembly house need?

[swen_s]

I'm about to order my first PCB and then also send the PCB to assembly.

What files do the PCB manufacturer need and what files do the assembly house need?

I have read that the x y coordinates of the components need to be in the center of gravity of the component. But how do I handle this if the components are not square?

And if I supply a pick and place file to the assembly house how do they know where I have set the center on my footprints?

 

[Mattylad]

Research ODB++

Then you only need to send them 1 file.

 

[PCB design]

Adding Fiducials in the design is a way out!

Files for Assembly - Assembly Top and Bottom (AST/ASB)

 

[mtwieg]

I've also wondered about this. How do you know where to define the origin of the component in terms of were a pick n place should grab it? And wouldn't you have to define the height of the component as well?

Research ODB++

Then you only need to send them 1 file.

Not everyone has the money to spend on a CAD package with a Valor license.

 

[marce]

Most packages these days do ODB++ output as standard, you do not have to pay Mentor for a license (Mentor own the ODB++ spec).
Otherwise its Gerber, Excellon drill file, IPC-D-356 netlist format, BOM and pick and place information. If you want info about component look up information on the IPC-7351 format, this will show you the component origin, also generaly the pick up point. Otherwise use the component centroid as a basis for youur pick up point, most component are pretty standard so this point will do. Make a fid the 0,0 point for your pick and place data. Hieght is only a concern for fitting in cases assembly house will sort out any height issues.

 

[Mattylad]

If your origin is in the wrong place then the manufacturer may be able to create their own P&P file using just the Gerber files if they have Graphicodes GC-Powerplace program.

If it is an oddball component then they will figure out the centre point on the machine itself so do not worry about it.