Reply to: RE>largest circuit board holes allowable... Barry: The size of the hole is not the issue. A properly adjusted wave solder machine will have the crest of the wave reach the middle of the board thickness, allowing the solder to wick up the plated holes. If the wave is adjusted too high, the leading edge of the board and any large opening inside the board outline will scoop the solder onto the top of the board and flood it. Disk drive manufacturers have been building control PCAs for years with LARGE holes for the spindle motors. They don't have the problem, because they pay close attention to the height of the wave itself as the board crosses the wave.. Also, I assume that the holes for the clips are NOT plated holes. Due to the surface tension of the solder, bare unplated holes will discourage the solder from trying to flow over the top of the board. Hope this eases your mind. Bill Fabry Truevision, Inc. -------------------------------------- Date: 10/2/96 6:20 PM To: Bill Fabry From: Barry Cavanaugh I am designing an assembly that uses plastic molded clips to attach a circuit board to a button matrix. The design requires that holes (for the clips) be incorporated within the body of the board... My question is: for a board that is wave soldered, how large can I make these square openings before solder starts to pour over onto the top of the board... Please share any experiences that you have had... Thanks... Barry Cavanaugh Hughes Network Systems Div. of Hughes Electronics San Diego, CA USA *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To unsubscribe from this list at any time, send a message to: * * [log in to unmask] with <subject: unsubscribe> and no text. * *************************************************************************** ------------------ RFC822 Header Follows ------------------ Received: by rainbow.truevision.com with SMTP;2 Oct 1996 18:18:15 U Received: from ipc.org by simon.ipc.org via SMTP (940816.SGI.8.6.9/940406.SGI) id TAA25251; Wed, 2 Oct 1996 19:57:30 -0700 Resent-Date: Wed, 2 Oct 1996 19:57:30 -0700 Received: by ipc.org (Smail3.1.28.1 #2) id m0v8bsc-0000RMC; Wed, 2 Oct 96 19:43 CDT Resent-Sender: [log in to unmask] Old-Return-Path: <[log in to unmask]> From: "Barry Cavanaugh" <[log in to unmask]> Message-Id: <[log in to unmask]> Date: Wed, 2 Oct 1996 17:51:43 -0700 X-Mailer: Z-Mail (3.2.1 10apr95) To: [log in to unmask] Subject: largest circuit board holes allowable... Cc: [log in to unmask] Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Resent-Message-ID: <"B6rD82.0.CHN.MmmKo"@ipc> Resent-From: [log in to unmask] X-Mailing-List: <[log in to unmask]> archive/latest/6647 X-Loop: [log in to unmask] Precedence: list Resent-Sender: [log in to unmask] *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To unsubscribe from this list at any time, send a message to: * * [log in to unmask] with <subject: unsubscribe> and no text. * ***************************************************************************