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SMT Bead Shearing

smd

#13505

SMT Bead Shearing | 13 November, 1998

Anyone using SMT "Fair-Rite" beads? We have a P/N 2743019447 that we're using. We need to know the shear force strength of the part and the vendor's man who knows is in Deutschland and can't help until Monday. I can't wait that long.

Also, does anyone know the best way to measure shear force?

Many thanks in advance toanyone who knows and tells.

Scott Davies Perf Tech 716-256-0200 X280

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Dave F

#13506

Re: SMT Bead Shearing | 13 November, 1998

| Anyone using SMT "Fair-Rite" beads? We have a P/N 2743019447 that we're using. We need to know the shear force strength of the part and the vendor's man who knows is in Deutschland and can't help until Monday. I can't wait that long. | | Also, does anyone know the best way to measure shear force? | | Many thanks in advance toanyone who knows and tells. | | Scott Davies | Perf Tech | 716-256-0200 X280 | smd: Check-out the following thread: Dave F

Shear strength and Copper/Tin Intermetalic layer - Chiakl 20:32:34 07/06/1998

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Dave F

#13507

Re: SMT Bead Shearing | 13 November, 1998

| Anyone using SMT "Fair-Rite" beads? We have a P/N 2743019447 that we're using. We need to know the shear force strength of the part and the vendor's man who knows is in Deutschland and can't help until Monday. I can't wait that long. | | Also, does anyone know the best way to measure shear force? | | Many thanks in advance toanyone who knows and tells. | | Scott Davies | Perf Tech | 716-256-0200 X280 | Scott: Where is the problem? When you have a board in one hand and a sheared ferrite in the other, what does the ex-ferrite location look like:

1 Green mask colored, because the pad is "ripped off" the board 2 Gray lumpy looking, because the solder joint failed 3 Mostly black, because the ferrite is neither completely here or there 4 Something else .... What pray tell!!

TTYL

Dave F

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smd

#13508

Re: SMT Bead Shearing | 14 November, 1998

| | | Scott: Where is the problem? When you have a board in one hand and a sheared ferrite in the other, what does the ex-ferrite location look like: | | 1 Green mask colored, because the pad is "ripped off" the board | 2 Gray lumpy looking, because the solder joint failed | 3 Mostly black, because the ferrite is neither completely here or there | 4 Something else .... What pray tell!! | | TTYL | | Dave F | Dave:

From what I have seen, a few beads have popped off the board. Left behind is the solder and pad. There doesn't appear to be a problem with process (reflow settings are OK, solder is OK, and stencil apertures are OK) and, as I now understand, the component is available without Ni, which appears to decrease the shear resistance of the component.

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