Electronics Forum | Tue Jan 16 11:24:47 EST 2007 | realchunks
I think John is right. I've seen the same thing (I think, without a picture who knows)on heavy heatsink parts. But I've also seen this happen on larger parts that move right after being wave soldered. I'm talking within a second or two of being so
Electronics Forum | Wed Aug 07 18:00:56 EDT 2019 | orbitcoms
I am doing another run today. I'll check how central the machine is placing the components onto the pads. I wonder if the part is off slightly and smudges past across the pins? What about if the part is being placed too deep into the paste?
Electronics Forum | Wed Aug 07 18:25:52 EDT 2019 | slthomas
Normally if the package is defined properly I would expect your machine to place it correctly but we have some parts pushed right down to the pads. If the paste is centered, and the parts are centered, and you have obvious bridging potential coming
Electronics Forum | Wed Oct 20 07:55:02 EDT 2004 | Rob
Gentlemen, Thanks for your feedback - I think we are going to have to stay with the parts we are using. Cheers, Rob.
Electronics Forum | Wed Aug 07 12:41:58 EDT 2019 | slthomas
Are the apertures on the stencil reduced in width or 1:1 with the pads? It depends on the pad width and foil thickness but we usually reduce aperture width for any part that results in an aperture wall spacing of less than 8.5 mils.
Electronics Forum | Wed Aug 07 22:40:03 EDT 2019 | slthomas
Most placement machines will do a check for that prior to placement and reject the parts. I just wondered if that was something that you'd experienced while also seeing the bridges.
Electronics Forum | Thu Oct 28 05:49:41 EDT 2004 | Rob
Any comments to add Dave?
Electronics Forum | Thu Nov 04 12:41:37 EST 2004 | cobar
Definetely 245�C
Electronics Forum | Wed Aug 07 17:20:17 EDT 2019 | orbitcoms
The aperture over the pads is set to 95% coverage of the pad. The stencil is 0.12 mm thick.
Electronics Forum | Wed Aug 07 18:32:22 EDT 2019 | orbitcoms
How would I measure/observe coplanarity issues ?
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