Hi Brad,

I dont know whether there is an acceptable standard of wastage out
there, but the wastage is highly dependant upon the type of machine you
are using, it's condition, your production run sizes (there is usually a
settling down period when lots of feeders have been changed over), and
how much effort the company is willing to put into resolving the wastage
problems.

Some companies I have seen trigger an alarm when their wastage gets
above 0.1%; other smaller ones seem to think that 4% wastage on 0402
components is normal.

For a small - medium volume company using a Fuji CP4-2, (assuming it is
similar to a CP4-3), my best guess for what it is worth is  - 1206 -
hardly any wastage (say less than 0.1%), 0603 components 0.3%, and I
think that it will struggle with 0402 components (wastage at least 1-2%
as a wild guess).

But like I say it is going to be pretty dependant on your
circumstances.  No doubt there are lots of other opinions out there.

Regards,

Chris Murphy

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