Electronics Forum: bottom (Page 7 of 227)

Magnets in the bottom of CP6 feeders ?

Electronics Forum | Tue Dec 05 09:09:38 EST 2006 | sigmasmt

These feeders come from an old OEM plant. They had a in house system they put together so the machine will not run until you had the correct feeder in place. Once the feeder was scanned and put into the feeder slot, the magnet would help recognize t

Double sided SMT, bottom side first or top side first ?

Electronics Forum | Wed Mar 05 08:05:46 EST 2003 | Yngwie

Thanx Marc..this is good input.

Double sided SMT, bottom side first or top side first ?

Electronics Forum | Tue Mar 04 00:55:12 EST 2003 | nifhail

In the double sided SMT process assembly, normally the bottom side will be processed first, due to it's lesser density as well as it's lesser heavy components. Apart from worrying about the component falling down, what are the potential problems that

Process ideas for adhesive on bottom side SMD's and wave solder

Electronics Forum | Tue Nov 22 17:08:03 EST 2011 | mikenagle

I am looking for process suggestions. We want to use a pin transfer system to deposit adhesive to hold bottom side SMD's in place. We will place SMD's and through hole power parts on the top side and then run through a wave solder machine. Are ther

Double sided SMT, bottom side first or top side first ?

Electronics Forum | Tue Mar 04 13:32:17 EST 2003 | MA/NY DDave

Hi Unless I am missing something, None if done right. YiEng, MA/NY DDave

Process ideas for adhesive on bottom side SMD's and wave solder

Electronics Forum | Wed Nov 23 07:30:44 EST 2011 | scottp

Are you stuck with pin transfer for some reason? Screen printing is more repeatable and easier to maintain.

Double sided SMT, bottom side first or top side first ?

Electronics Forum | Tue Mar 04 18:38:12 EST 2003 | ruggi

Most of what we do (across 800+ varieties) is bottom side first. In general, there really aren't any problems as long as our Customers follow the .25g/cm wetted lead perimeter spec for weight (which many don't), and don't mount tall components on th

Double sided SMT, bottom side first or top side first ?

Electronics Forum | Fri Mar 07 03:37:26 EST 2003 | emeto

Hi Ygwie, My experience shows there is not unique answer.Actually it depends on design,printing reflow or wave.It might be top side with lesser cmps.Top side might have fine pitch or BGA or CSP,LLGA ....,so you have better planarity when the PCB is b

Process ideas for adhesive on bottom side SMD's and wave solder

Electronics Forum | Wed Nov 23 07:38:49 EST 2011 | davef

We agree with the points made by ScottE above. Additionally, most printers are not heavily loaded. So, you wouldn't have to buy another machine, give-up floor space, purchase and store peculiar tooling, etc. We think Darby does pin transfer. Maybe h

Process ideas for adhesive on bottom side SMD's and wave solder

Electronics Forum | Wed Nov 23 09:38:52 EST 2011 | blnorman

More agreement with screen print adhesives. Back in a former life time we did do pin transfer on one of our product lines. If you had to go with pins, make sure your adhesive rheology is suited for it. Different adhesives are designed for specific


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