Richard,

You can use the min/max data from the IPC specs to create min/max clearance
for the "oval" lead.  (IPC-2222, Sec. 9.2.2)  Ex.: If the min/max clearance
calculated to be .012/.028, and the lead size is .024 x .050, then the slot
size could be somewhere between .036 x .062 and .052 x .078 .  This may be
over-simplified, but you get the idea.  This could apply to any oblong lead
or rectangular lead.

Hope that helps.  It's worked for me in the past.

 Roger M. Stoops,       PCB Designer
 C.I.D.

 Member IPC Designer's
 Council









                    Richard Hawkins
                    <Richard_Hawkins@C        To:     [log in to unmask]
                    EILTD.COM>                cc:
                    Sent by:                  Subject:     [DC] Oval Lead into Oval Hole
                    DesignerCouncil
                    <DesignerCouncil@I
                    PC.ORG>


                    06/16/00 06:04 PM
                    Please respond to
                    "DesignerCouncil
                    E-Mail Forum.";
                    Please respond to
                    Richard Hawkins





Hello all,

I am having trouble finding design specs for an oval component lead going
into an oval hole.  The component is an indictor that is about 25mm in
diameter and the lead is made by soldering two 16ga wires together.  The
shape of the lead is more like a rectangle with a full radius at the short
sides than an oval and the hole in the pcb is the same shape.

My task is to evaluate a design, that is already in production, to see if
it
should be changed and make recommendations if so.  However, I have not been
able to find anything in my IPC manuals that approaches this situation.

My question then, is what guidelines for layout should I use?

Any help will be appreciated.

Richard Hawkins