Bev, here is my two cents worth.  2) purpose:  is to provide support with a
material that will allow for expansion of board and part. (so leads do not
pull out of component or solder joints). I have seen cases where assy were
potted and the potting material went underneath resulting in a condition we
call hard mounting.  Which matches your comment about strain on solder
joint.  3) inspection:  hopefully eye (that why some of us would like to see
visual acuity requirements) Design folks should do the measurement effort.
Jon

 -----Original Message-----
From:   Bev Christian [mailto:[log in to unmask]]
Sent:   Friday, July 21, 2000 7:52 AM
To:     [log in to unmask]
Subject:        [TN] Mounting- Vertical - Radial Leaded

Here's an easy one.  Page 5-12 of IPC-A-610C shows radial PTH components
with a standoff between the component base and the board.  1) How do you all
meet this requirement?  2) What is the purpose of it? 3) How do you
inspection for it?
 My guesses:
1) lead forming, soluble plastic disks or tubing, friction fit, by chance,
don't
2) heat dissipation, inspection, strain on solder joint
3) eye, thickness gauge, don't

I await your sage comments, oh wise ones.

regards,

Bev Christian
XLTEK

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