SMT optimization and improvement

Hi Jack,

I do not know what type of machine you are using and how old is your machine. But I have this problem before using Fuji machine. There are few things cause part throw.....placment speed, feeder, pick up tolerance, part dimension tolerance, etc.... How I over come this is to make sure the feeder is in good condition with no feeding problem and reduce the placement speed to the slowest speed. From there, slowly increase the placement speed. Normally, camspeed for placing 0805 and 0603 should not be problem, but after few years of running, there is wear nd tear.......now I'm using 80% to 90% placement for 0805 and 0603 component. I do a 100% inspection before reflow and spend almost 3 month to resolve the pick and throw and at the same time resolve misalignment and missing component. Todat the yield is talking about 98% to 99.5%.

Regards, EC

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I'm not sure if anyone mentioned the single most important factor. p.m.'s. If the nozzles are getting dirty and clogged it's not going to do a great job of picking parts up.

Don't think in terms of variation. It's there it's unavoidable and undetectable. Make your system able to handle the variation. If you look closely at a group of (for instance) ceramic capacitors, they will all be slightly different.

The original poster no doubt was thinking that all parts are the same so why does it pick and place some but not others. Well the parts are not all the same if you measure accurately enough.

I noticed the first post is several months old and I'm wondering how it's going for him.

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