Universal Instruments has a "Through Hole Design Guidelines" document that I
remember that is pretty extensive. I looked for it and found it here:
http://www.jsd.com.ua/354-01.pdf
Go to page 82 and it talks about hole diameters. Guy is right, .010" larger
than the lead diameter for autoinsertion...
Steve
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Guy Ramsey
Sent: Monday, December 19, 2011 12:00 PM
To: [log in to unmask]
Subject: Re: [TN] PTH hole size "standards"
It has been a long time but as I recall, our Amistar and Netco insertion
equipment required the hole to be .010" larger than the diameter or diagonal
of the lead.
Guy
-----Original Message-----
From: Phil Nutting [mailto:[log in to unmask]]
Sent: Monday, December 19, 2011 11:52 AM
To: Guy Ramsey; 'TechNet E-Mail Forum'
Subject: RE: [TN] PTH hole size "standards"
Guy,
That is one of my arguments against the change to a smaller hole.
Phil
-----Original Message-----
From: Guy Ramsey [mailto:[log in to unmask]]
Sent: Monday, December 19, 2011 11:41 AM
To: 'TechNet E-Mail Forum'; Phil Nutting
Subject: RE: [TN] PTH hole size "standards"
Something to consider, machine insertion and the limitation of this type
equipment.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Phil Nutting
Sent: Monday, December 19, 2011 10:42 AM
To: [log in to unmask]
Subject: Re: [TN] PTH hole size "standards"
Phil,
Yes, that is correct.
I'm also trying to avoid changing back to machine screw contact sockets.
That is soooo '70s ish.
Phil
-----Original Message-----
From: [log in to unmask] [mailto:[log in to unmask]]
Sent: Monday, December 19, 2011 10:40 AM
To: TechNet E-Mail Forum; Phil Nutting
Subject: RE: [TN] PTH hole size "standards"
To clarify, the lead is actually a flat .021" x .010", or something along
those lines, correct?
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Phil Nutting
Sent: Monday, December 19, 2011 7:31 AM
To: [log in to unmask]
Subject: [TN] PTH hole size "standards"
7 days until the Fat Man comes visiting. Yikes!
We recently had a problem with flux residue under a PTH dual inline IC.
The problem appears to be caused by our hole diameter of 0.035" and the
tapered shape of the step in the leads allowing the device to sit closer or
flush with the board causing apparent flux entrapment.
I'm thinking this is more of a process issue of amount of flux, board
orientation in the wash, wash time/temp or DI water quality.
The responsible engineer would like to decrease the hole size to 0.025 to
effectively raise the part above the board. And he wants to change all the
ICs on this board and most likely all his boards going forward.
So the questions comes up, what is the "standard" hole size for a dual
inline IC, 0.021 wide pin, plated thru hole, 0.062 thick board, OA flux foam
application and RoHS wave solder.
Please add some sanity to my life.
Phil Nutting
Design for Manufacturing Engineer
Kaiser Systems, Inc.
126 Sohier Road
Beverly, MA 01915
Phone: 978-922-9300 x1310
Fax: 978-922-8374
e-mail: [log in to unmask]<mailto:[log in to unmask]>
www.kaisersystems.com<http://www.kaisersystems.com>
www.linkedin.com/in/philnutting<http://www.linkedin.com/in/philnutting>
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