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November 2001

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Subject:
From:
Guy Ramsey <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Tue, 27 Nov 2001 14:32:56 -0500
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text/plain
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text/plain (65 lines)
There was a post on this last year. And a good response. I do not remember
all the fields.
P Place accuracy is an allowance for your pick and place equipment.
The solder joint design goals are derived from the component and the type of
solder fillet you want. Minimum Heel fillet height for example, Class 3 is
the thickness of the solder under the lead plus the thickness of the lead .
. . I wouldn't expect there to be too much solder under the lead. So, the
thickness of the lead would be an appropriate value to place there.

If this was not enough help try the archive . . . If that doesn't help. Post
back and I will try harder.

> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]]On Behalf Of Yu-Hung Shiau
> Sent: Monday, November 26, 2001 5:53 PM
> To: [log in to unmask]
> Subject: [TN] IPC SM-782 on-line calculator
>
>
> Hi,
> Does anyone know how to use the on-line SM-782 calculator? There are few
> fields I don't know what numbers should I plug in.
>
> 1-1. Man. Allowance- P Place Accuracy
> 1-2. Man. Allowance- J/T Toe Min.
>
> 2-1. Solder Joint Design Goal- J/T Toe Min
> 2-1. Solder Joint Design Goal- J/H Heel Min
> 2-1. Solder Joint Design Goal- J/S Side Min
>
> I have lost my hard copy of my IPC SM-782 standard for a while.
>
> By the way, which category I should go for the resistor array (resistor
> network) while I use the SM-782 calculator?
>
> Thank you all for any feedback.
> YH Shiau
>
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