thankyou,
-you have confirmed the way we have always done it...........by simply paying someone to look at the interface, and note that there is some paste squished out.
However, we have found that assembly staff are just making sure that there is a bit of paste round the outside, and they are not applying the paste properly on the inner bits........
the thing is, the paste is gooey and messy and unpleasant....staff do not like it, they suspect its carcinogenic, and keep handling of it to a minimum.......they simply press the heatsink on to a surface on which the paste is spread, ...and then make sure they get enough round the outside....but dont bother getting enough paste on the inner bits which we cannot see whan its all assembled.
...when they are running out and should get some more paste, they dont bother at first, and so loads of heatsinks are getting assembled with not enough paste......but the staff do make sure that there is enough paste round the outside so that they look properly pasted.
....some assembly staff have told us that they simply dont believe that the paste is necessary, and think just screwing metal to metal is sufficient.
I can't see how we can possibly check that all FET/heatsinks are getting properly pasted....any ideas?