NetNews Usenet Archive 1992 #16/NN_1992_16.iso/spool/sci/electron/13681

Text File | 1992-07-30 | 1.7 KB | 37 lines

Newsgroups: sci.electronics
Path: sparky!uunet!zaphod.mps.ohio-state.edu!darwin.sura.net!convex!news.oc.com!utacfd.uta.edu!trsvax!rwsys!jim
From: [e-mail] (James T. Wyatt)
Subject: Re: 0.100" spacing
Organization: R/W Systems, Richland Hills, Texas, USA, 76118-5849
Date: Fri, 31 Jul 1992 01:48:31 GMT
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]>
Lines: 26

[e-mail]  writes:
> Now, I have another question! Previously, I've been drilling holes for my
>IC's with a drill press, which isn't so bad for the small 16 pin IC's.
>I can usually eyeball where the drill press will drill with reasonable
>accuracy, and any variation can be compensated by bending the pins of the
>IC socket or IC to fit.
>
> However, I have a 64 pin IC that I want to put on a circuit board. I don't
>wish to have to get a stronger eyeglass prescription after drilling the holes.
>So does anyone have any techniques or equipment that they use to drill these
>types of things?

I usually line-up the holes of some .1 x .1 breadboarding perfboard over
the spots in the traces. Then use the holes to guide the bit. It helps to
dril a hole without it first, then use a pin to lock the two boards
together. Then do the opposing corner and use a locking pin. Then the
other holes are all easy!

If you do it by hand or with a translation table that isn't *exact*, you
will have a dickens of a time getting all the legs of the 64 pin socket
into the holes...

btw: This trick makes 14/16/20/24/28/40 pin holesets easier as well - jim

--
James Wyatt  KA5VJL  [e-mail]  Semper Gumbi - always flexible!