Fred
A homeplate aperture is a stencil opening shaped like a baseball
homeplate. The pointy bit is towards the centroid of the part. The
idea with them is that you avoid a lot of solder ball issues by reducing
or eliminating the paste squeeze-out to the sides of the component, but
still have enough paste to provide a good fillet. Very helpful if you
are running a no-clean process.
regards,
Graham Collins
Process Engineer,
Northrop Grumman Canada Corporation
Halifax
(902) 873-2000 ext 6215
>>> [log in to unmask] 05/27/03 10:49AM >>>
What is a homeplate aperture?
Thanks,
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Howard
Watson
Sent: Thursday, May 22, 2003 5:38 PM
To: [log in to unmask]
Subject: [TN] Sideways Resistors
Technetters,
I'm not sure if others see this situation, but it's a somewhat rare
occurrence when we see some resistors, like 0805's, soldered on their
sides. Though it's not a defect per the conditions of IPC-A-610, I am
still curious as to the root cause. I don't know if they somehow get
placed on their side or if they get pulled up that way during
soldering.
Our P&P machine is a Mydata MY15, we use no-clean with reflow in air,
HASL boards, 6 mil stencil w/ homeplate apertures.
Any thoughts?
Howard Watson
SMT Manufacturing Engineer
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