If I remember correctly...
I don't think we punched anything less than 40 mil [1 mm]. I don't
think there WAS a maximum, but I can't remember punching larger than a
60 mil [1.5 mm] round hole. We commonly punched slots for relay frame
leads and such that had the long dimension larger than that, though.
Minimum spacing was 1.5X board thickness, but usually that was not a
problem as we used around a 20 mil [0,5 mm] annular ring on the pads and
between minimum spacing and annular ring were usually further apart than
we needed.
The insertion folks preferred the punched boards, too. The holes were
slightly larger on the insertion side of the board than on the copper
side so they could run the VCD inserters faster than they could for an
equivalent drilled hole (or so they claimed, anyway).
--
George Patrick
Tektronix, Inc.
Central Engineering, Engineering Design Services
P.O. Box 500, M/S 39-512
Beaverton, OR 97077-0001
* 503-627-5272 (voice) * 503-627-5587 (fax)
http://www.tektronix.com http://www.pcb-designer.com
"Off-Grid and Proud of it!"
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Joe Fjelstad
Sent: Monday, March 20, 2006 16:48
To: [log in to unmask]
Subject: Re: [TN] Die Punching PWBs as opposed to drilling and NC
routing
In a message dated 3/20/2006 4:16:28 P.M. Pacific Standard Time,
[log in to unmask] writes:
I would love to see some cross-section pictures of the plating of a
punched hole near the _end_ of a production run :)
I would like to also, George...
If you can recall and don't mind sharing the info, what was he minimum
hole
size you punched and what was the maximum number? Also what minimum
spacing
was allowed?
Thanks.
Kind regards,
Joe
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