Phil:
Your drawing does show a 0.0215" radius, since you indicate the radius
locations with an 0.043" hole. As a board fabricator, I think your fab shop
missed the call out and used a standard cutter to profile the part. We
typically stock bits in the following sizes to handle issues like this.
0.025", 0.031", 0.036", 0.040", 0.047", 0.050", 0.055", 0.062", 0.093",
0.100", and 0.125".
To clarify what you want, I would create a detail drawing of the cut out and
indicate the radius location with a 0.0215" Maximum call out.
If you need to put the proverbial square peg in a round hole, the corners of
the cutout can be over routed in one direction removing the radius from the
component location.
Robert B. Denbo
MIS / Engineering Manager
Midwest Printed Circuit Services, Inc.
http://www.midwestpcb.com
mailto:[log in to unmask]
847.740.4120
847.740.4187 Fax
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Phil Nutting
Sent: Wednesday, May 01, 2002 11:56 AM
To: [log in to unmask]
Subject: [TN] Hole routing in PCBs
Hi all,
I wanted to tap into your collective knowledge (opinions). We have a small
circuit board that is supposed to have a rectangular cutout to accept
ferrite cores. My board house used an 0.093 diameter cutter with the
argument that it cut through the "corner holes" specified on the print. He
says that I need to add a radius spec to my board drawing. My board
designer (and I) have reviewed this board and think that it is clear what
should be done [we need the 0.043 (0.0215 radius corners) holes for
clearance].
I have asked Steve Gregory to post a JPEG file of the board. It can be found
at;
http://www.stevezeva.homestead.com/ and click on "Routing", or
http://www.stevezeva.homestead.com/files/Routing.jpg
How do you think this should be specified/machined?
Thanks in advance. Thanks Steve for posting the file.
Phil Nutting
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