EEVblog #239 - PCB Design For Manufacture Part 2

[Blue]

Great video blog. 

Thanks a lot, I've learned quite a bit.

Apparantly there is a lot of waste in unused parts. Is there an alternative for this? Can't the manufacturer put an extra leader tape on the reals or are they just lazy?

[mikeselectricstuff]

Full reels have leaders and trailers, which is fine as long as you are using enough to buy full reels.
Some distributors will cut tape and add leaders and trailers, but the splices can sometimes be a problem going through feeders.

[IanB]

I'm thinking that all the lost and unused parts might find their way into lucky dip "grab bags" full of random stuff on surplus and auction sites. Does this ever happen or do the wasted parts just get thrown away?

[Blue]

I don't know what happens with the waste.

What I do know is that surplus reels gets grabbed by traders. Sometimes I meet one of them at ham fests (trade show targetted at hams). Unfortunately I cannot order reels since this guy has too much. He rather shovels some of his wares into big boxes for potential customers to browse. Then he charges according to what it is e.g. Resistors €5, electrolytic caps, mini switches €25.

[mikeselectricstuff]

I'm thinking that all the lost and unused parts might find their way into lucky dip "grab bags" full of random stuff on surplus and auction sites. Does this ever happen or do the wasted parts just get thrown away?

Chip parts are so cheap they're just not worth recovering, much less sorting.
For expensive parts, I'd expect they program the P&P machine to put parts rejected by vision in a specific bin, or if in a tray, back into the tray.

[Neilm]

I'm thinking that all the lost and unused parts might find their way into lucky dip "grab bags" full of random stuff on surplus and auction sites. Does this ever happen or do the wasted parts just get thrown away?

Chip parts are so cheap they're just not worth recovering, much less sorting.
For expensive parts, I'd expect they program the P&P machine to put parts rejected by vision in a specific bin, or if in a tray, back into the tray.

One problem with this is that once out of the packaging, the chips are very susceptible to ESD damage. The worst part about that is that there is no quick way of knowing this - sometimes ESD damage doesn't show up until after several months of operation.

Neil

[oodavid]

Just watched this and PT1, along with a swathe of other EEVBlog videos, I'm new to electronics but am keen to get my feet wet - great work.

The only issue is that now my "watch later" is about 100 hours long... time to skill up!

Apologies for necromancing.